Dialogic® Global Call IP
Technology Guide
May 2014
05-2239-012
Dialogic® Global Call IP Technology Guide
Copyright and Legal Notice
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Publication Date: May 2014
Document Number: 05-2239-012
Dialogic® Global Call IP Technology Guide 3
Contents
Copyright and Legal Notice. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Applicability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Intended Audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
How to Use This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1 IP Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.1 Introduction to VoIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.2 H.323 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.2.1 H.323 Entities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.2.2 H.323 Protocol Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.2.3 Codecs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.2.4 Basic H.323 Call Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.2.5 Registration with a Gatekeeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1.2.6 H.323 Call Scenario via a Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.3 SIP Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.3.1 Advantages of Using SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.3.2 SIP User Agents and Servers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.3.3 Basic SIP Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
1.3.4 Basic SIP Call Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
1.3.5 SIP Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2 Dialogic® Global Call API Architecture for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.1 Dialogic® Global Call API over IP Architecture with a Host-Based Stack . . . . . . . . . . . . . 35
2.2 Architecture Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.2.1 Host Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.2.2 Dialogic® Global Call API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.2.3 IP Signaling Call Control Library (IPT CCLib) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.2.4 IP Media Call Control Library (IPM CCLib) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.2.5 IP Media Resource . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.3 Device Types and Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.3.1 Device Types Used with IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.3.2 IPT Board Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.3.3 IPT Network Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.3.4 IPT Start Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3 IP Call Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.1 Basic Call Control Scenarios When Using IP Technology. . . . . . . . . . . . . . . . . . . . . . . . . 43
3.1.1 Basic Call Setup When Using H.323 or SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.1.2 Basic Call Teardown When Using H.323 or SIP. . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.1.3 Call Setup Scenarios for Early Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4Dialogic® Global Call IP Technology Guide
Contents
3.2 Call Transfer Scenarios When Using H.323 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.2.1 General Conditions for H.450.2 Call Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.2.2 Endpoint Behavior in H.450.2 Blind Call Transfers . . . . . . . . . . . . . . . . . . . . . . . . 49
3.2.3 Successful H.450.2 Blind Call Transfer Scenario . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.2.4 Unsuccessful H.450.2 Blind Call Transfer Scenarios . . . . . . . . . . . . . . . . . . . . . . 53
3.2.5 Endpoint Behavior in H.450.2 Supervised Call Transfer . . . . . . . . . . . . . . . . . . . . 58
3.2.6 Successful H.450.2 Supervised Call Transfer Scenario . . . . . . . . . . . . . . . . . . . . 59
3.2.7 Unsuccessful H.450.2 Supervised Transfer Scenarios . . . . . . . . . . . . . . . . . . . . . 61
3.3 Call Transfer Scenarios When Using SIP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
3.3.1 General Conditions for SIP Call Transfers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
3.3.2 Endpoint Behavior in Unattended SIP Call Transfers . . . . . . . . . . . . . . . . . . . . . . 67
3.3.3 Successful Unattended SIP Call Transfer Scenarios . . . . . . . . . . . . . . . . . . . . . . 70
3.3.4 Endpoint Behavior in Attended SIP Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
3.3.5 Successful SIP Attended Call Transfer Scenarios. . . . . . . . . . . . . . . . . . . . . . . . . 78
3.3.6 Unsuccessful Call Transfer Scenarios. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
3.4 T.38 Fax Server Call Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
3.4.1 Sending T.38 Fax in an Established Audio Session . . . . . . . . . . . . . . . . . . . . . . . 90
3.4.2 Receiving T.38 Fax in an Established Audio Session . . . . . . . . . . . . . . . . . . . . . . 91
3.4.3 Sending T.38 Fax Without an Established Audio Session. . . . . . . . . . . . . . . . . . . 93
3.4.4 Receiving T.38 Fax Without an Established Audio Session . . . . . . . . . . . . . . . . . 94
3.4.5 Sending a Request to Switch From T.38 Fax to Audio . . . . . . . . . . . . . . . . . . . . . 95
3.4.6 Receiving a Request to Switch From T.38 Fax to Audio . . . . . . . . . . . . . . . . . . . . 96
3.4.7 Terminating a Call After a T.38 Fax Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
3.4.8 Recovering from a Session Switching Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4 IP-Specific Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
4.1 Call Control Library Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
4.1.1 Setting a SIP Outbound Proxy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
4.1.2 Configuring SIP Transport Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
4.1.3 Enabling and Disabling H.245 Tunneling (H.323) . . . . . . . . . . . . . . . . . . . . . . . . 107
4.2 Fast and Slow Call Setup Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
4.2.1 Setting the Call Setup Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
4.2.2 H.323 Fast Start and Slow Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
4.2.3 H.323 Fast Start with Optional H.245 Channel . . . . . . . . . . . . . . . . . . . . . . . . . . 110
4.2.4 SIP Call Setup Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
4.2.5 Retrieving Coder Information from Call Offers. . . . . . . . . . . . . . . . . . . . . . . . . . . 112
4.3 Setting Call-Related Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
4.3.1 Overview of Setting Call-Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
4.3.2 Setting Coder Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
4.3.3 Specifying Nonstandard Data Information (H.323) . . . . . . . . . . . . . . . . . . . . . . . 121
4.3.4 Specifying Nonstandard Control Information (H.323) . . . . . . . . . . . . . . . . . . . . . 123
4.3.5 Specifying IPv4 or IPv6 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
4.4 Connection Phase Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
4.4.1 Setting and Retrieving Disconnect Cause or Reason Values . . . . . . . . . . . . . . . 126
4.4.2 Setting Busy Reason Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
4.4.3 SIP Provisional (1xx) Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
4.4.4 SIP Redirection (3xx) Response Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
4.4.5 SIP Rejection Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
4.4.6 Configuring Proceeding Message Generation (H.323) . . . . . . . . . . . . . . . . . . . . 135
4.5 Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Dialogic® Global Call IP Technology Guide 5
Contents
4.5.1 Enabling Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
4.5.2 Dialogic® Global Call API Line Devices for Call Transfer . . . . . . . . . . . . . . . . . . 137
4.5.3 Incoming Transferred Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
4.5.4 Call Transfer Glare Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
4.5.5 Call Transfer When Using SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
4.6 Retrieving Current Call-Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
4.6.1 Retrieving Nonstandard Data From Protocol Messages (H.323) . . . . . . . . . . . . 149
4.6.2 Examples of Retrieving Call-Related Information . . . . . . . . . . . . . . . . . . . . . . . . 149
4.7 Receiving Notification Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
4.7.1 Enabling and Disabling Unsolicited Notification Events . . . . . . . . . . . . . . . . . . . 158
4.7.2 Getting Media Streaming Status and Connection Information . . . . . . . . . . . . . . 160
4.7.3 Getting Notification of Underlying Protocol State Changes . . . . . . . . . . . . . . . . 162
4.8 Modifying an Existing SIP Call via re-INVITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
4.8.1 Overview of the SIP re-INVITE Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
4.8.2 Enabling Application Access to re-INVITE Requests . . . . . . . . . . . . . . . . . . . . . 164
4.8.3 Receiving SIP re-INVITE Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
4.8.4 Responding to SIP re-INVITE Requests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
4.8.5 Sending a SIP re-INVITE Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
4.8.6 Canceling a Pending re-INVITE Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
4.8.7 Updating Dialog Properties via re-INVITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
4.8.8 Implementing Hold and Retrieve via SIP re-INVITE . . . . . . . . . . . . . . . . . . . . . . 172
4.9 Setting and Retrieving SIP Message Header Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
4.9.1 SIP Header Access Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
4.9.2 Enabling Access to SIP Header Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
4.9.3 Enabling Long Header Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
4.9.4 Registering SIP Header Fields to be Retrieved . . . . . . . . . . . . . . . . . . . . . . . . . 182
4.9.5 Setting SIP Header Fields for Outbound Messages . . . . . . . . . . . . . . . . . . . . . . 185
4.9.6 Retrieving SIP Message Header Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
4.9.7 SIP Header for BYE and CANCEL Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 190
4.9.8 Configuring Persistent SIP Headers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
4.9.9 Retrieving SIP “To tag” for Inbound Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
4.10 Sending and Receiving MIME Bodies in SIP Messages (SIP-T). . . . . . . . . . . . . . . . . . . 196
4.10.1 SIP MIME Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
4.10.2 Enabling and Configuring the SIP MIME Feature . . . . . . . . . . . . . . . . . . . . . . . . 199
4.10.3 Getting MIME Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
4.10.4 Sending MIME Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
4.10.5 MIME Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
4.10.6 Inserting MIME Bodies in Outgoing SIP ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
4.11 MIME-Based Overlap Receive Support for Limited SIP-I Interworking Scenarios . . . . . 218
4.11.1 Feature Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
4.11.2 Enabling MIME-based Overlap Receive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
4.11.3 Usage Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
4.12 Overlap Send and Receive Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
4.12.1 Overlap Receiving (Ingress) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223
4.12.2 Overlap Sending (Egress) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
4.12.3 Enabling Overlap Signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
4.12.4 Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
4.12.5 Overlap Signaling Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
4.13 Specifying Transport for SIP Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
4.14 Handling SIP Transport Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
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4.15 Sending and Receiving SIP INFO Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
4.15.1 Sending an INFO Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
4.15.2 Receiving a Response to an INFO Message. . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
4.15.3 Receiving an INFO Message. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
4.15.4 Responding to an INFO Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
4.16 Sending and Receiving SIP OPTIONS Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
4.16.1 Default OPTIONS Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
4.16.2 Enabling Application Access to OPTIONS Messages . . . . . . . . . . . . . . . . . . . . . 240
4.16.3 Sending OPTIONS Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
4.16.4 Receiving Responses to OPTIONS Requests. . . . . . . . . . . . . . . . . . . . . . . . . . . 244
4.16.5 Receiving OPTIONS Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
4.16.6 Responding to OPTIONS Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
4.17 Sending and Receiving SIP SUBSCRIBE and NOTIFY Messages . . . . . . . . . . . . . . . . . 251
4.17.1 Sending SUBSCRIBE Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
4.17.2 Receiving Responses to SUBSCRIBE Requests . . . . . . . . . . . . . . . . . . . . . . . . 254
4.17.3 Receiving SUBSCRIBE Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
4.17.4 Responding to SUBSCRIBE Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
4.17.5 Sending NOTIFY Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
4.17.6 Receiving Responses to NOTIFY Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
4.17.7 Receiving NOTIFY Requests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
4.17.8 Responding to NOTIFY Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
4.18 Sending and Receiving SIP UPDATE Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
4.18.1 Enabling the Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
4.18.2 Usage Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
4.18.3 Handling SIP UPDATE Post-Connection Messages . . . . . . . . . . . . . . . . . . . . . . 273
4.19 Sending and Receiving SIP PRACK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274
4.19.1 API Library Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
4.19.2 Enabling PRACK Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
4.19.3 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
4.19.4 Specifying Reliable or Non-reliable SIP Provisional Responses . . . . . . . . . . . . . 282
4.20 Sending and Receiving SIP 183 Session Progress Messages . . . . . . . . . . . . . . . . . . . . 283
4.20.1 Receiving SIP 183 Session Progress Responses Containing SDP . . . . . . . . . .284
4.21 Receiving Multiple SIP 18x Provisional Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
4.21.1 Enabling and Disabling GCEV_EXTENSION . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
4.21.2 Retrieving 18x Code from GCEV_EXTENSION . . . . . . . . . . . . . . . . . . . . . . . . . 290
4.22 Defer the Sending of SIP Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
4.22.1 Deferring SIP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
4.22.2 Enabling the Deferral of SIP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
4.22.3 High-level Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
4.23 Service Uniform Resource Names (URNs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
4.23.1 Usage Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
4.24 Sending and Receiving DTMF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297
4.24.1 Specifying DTMF Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297
4.24.2 Getting Notification of DTMF Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
4.24.3 Generating DTMF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
4.24.4 Generating or Detecting DTMF Tones Using a Voice Resource. . . . . . . . . . . . . 302
4.24.5 Setting Receive-only RFC 2833 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
4.24.6 Retrieving SIP Inbound DTMF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
4.24.7 Exposing Raw RFC 2833 Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305
4.25 Specifying RTP Stream Establishment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309
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4.26 Managing Quality of Service Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309
4.26.1 Alarm Source Object Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
4.26.2 Retrieving the Media Device Handle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
4.26.3 Setting QoS Threshold Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
4.26.4 Retrieving QoS Threshold Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
4.26.5 Handling QoS Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
4.27 Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
4.27.1 Registration Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
4.27.2 Registration Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
4.27.3 Sending and Receiving Nonstandard Registration Messages (H.323). . . . . . . . 325
4.27.4 Registration Code Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
4.27.5 Gatekeeper Registration Failure (H.323) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
4.28 SIP Digest Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
4.28.1 Registering Authentication Data Without Realm String . . . . . . . . . . . . . . . . . . . 335
4.29 Using SIP Transport Layer Security (TLS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
4.29.1 Overview of TLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
4.29.2 Configuring and Enabling TLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
4.29.3 Making Calls Using TLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
4.29.4 TLS Transport Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
4.30 Accessing the Transport Layer IP Address of an Inbound SIP Call . . . . . . . . . . . . . . . . 357
4.30.1 Enabling Receipt of SIP Transport Address Information . . . . . . . . . . . . . . . . . . 357
4.30.2 Retrieving SIP Remote Transport Address Layer Information . . . . . . . . . . . . . . 358
4.31 SIP Session Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
4.31.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
4.31.2 Enabling SIP Session Timer in IP_VIRTBOARD . . . . . . . . . . . . . . . . . . . . . . . . 360
4.31.3 Configuring SIP Session Timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361
4.31.4 422 Response Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362
4.31.5 SIP Session Timer Supports SDP in Re-INVITE . . . . . . . . . . . . . . . . . . . . . . . . 363
4.32 Unspecified G.723.1 Bit Rate in Outgoing SIP Requests with SDP . . . . . . . . . . . . . . . . 363
4.32.1 Enabling the Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
4.32.2 Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
4.33 Dynamic Selection of Outbound SIP Proxy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
4.33.1 Enabling Dynamic Proxy Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
4.33.2 Dynamic Proxy Selection Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
4.34 Proxy Bypass in SIP Register Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
4.34.1 Enabling the Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
4.35 SIP WaitCall Cancellation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
4.36 Configuring SIP Stack Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
4.37 Setting Dialogic® IP Media Library Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
4.38 T.38 Fax Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
4.38.1 T.38 Fax Server Support Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
4.38.2 Specifying Manual Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
4.38.3 Initiating a Switch from Audio to T.38 Fax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377
4.38.4 Associating a T.38 Fax Device with a Media Device When a Fax Request is
Received . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
4.38.5 Accepting/Rejecting a Request to Switch Between Audio and T.38 Fax . . . . . . 379
4.38.6 Sending a T.38 Fax in a Session Without Audio Established . . . . . . . . . . . . . . . 380
4.38.7 Receiving a T.38 Fax in a Session Without Audio Established . . . . . . . . . . . . . 381
4.38.8 Sending a Request to Switch from T.38 Fax to Audio . . . . . . . . . . . . . . . . . . . . 382
4.38.9 Receiving a Request to Switch from T.38 Fax to Audio . . . . . . . . . . . . . . . . . . . 383
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4.38.10 Terminating a Call After a T.38 Fax Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384
4.38.11 Handling non-2xx Responses to T.38 Fax Switch . . . . . . . . . . . . . . . . . . . . . . . . 385
4.39 Sending and Receiving V.17 Faxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
4.39.1 Sending G.711 Fax in an Established Audio Session . . . . . . . . . . . . . . . . . . . . . 389
4.39.2 Receiving G.711 Fax in an Established Audio Session. . . . . . . . . . . . . . . . . . . . 390
4.40 Using Object Identifiers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .391
4.41 LAN Disconnection Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392
4.42 Setting and Retrieving Q.931 Message IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
4.42.1 Enabling Access to Q.931 Message IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
4.42.2 Supported Q.931 Message IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
4.42.3 Setting Q.931 Message IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
4.42.4 Retrieving Q.931 Message IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396
4.42.5 Common Usage Scenarios Involving Q.931 Message IEs . . . . . . . . . . . . . . . . . 397
4.42.6 Accessing Additional Q.931 Message IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397
4.43 Accessing H.323 ALERTING Progress Indicator Information Element . . . . . . . . . . . . . . 402
4.43.1 Enabling Access to H.323 IE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402
4.43.2 Disabling an Automatic PROGRESS Message . . . . . . . . . . . . . . . . . . . . . . . . . . 403
4.43.3 Setting the PIIE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403
4.43.4 Retrieving the PIIE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404
4.44 Sending Nonstandard Protocol Messages (H.323) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404
4.44.1 Nonstandard UII Message (H.245) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405
4.44.2 Nonstandard Facility Message (Q.931) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
4.44.3 Nonstandard Registration Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408
4.44.4 Sending Facility, UII, or Registration Message Scenario. . . . . . . . . . . . . . . . . . . 409
4.45 Using H.323 Annex M Tunneled Signaling Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 410
4.45.1 Tunneled Signaling Message Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410
4.45.2 Enabling Tunneled Signaling Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
4.45.3 Composing Tunneled Signaling Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
4.45.4 Sending Tunneled Signaling Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
4.45.5 Receiving Tunneled Signaling Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417
4.46 Retrieving User-to-User Information Elements from H.323 Messages. . . . . . . . . . . . . . . 421
4.46.1 Enabling Reception of User-to-User Information . . . . . . . . . . . . . . . . . . . . . . . . . 422
4.46.2 Retrieving UU-IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
5 Third Party Call Control (3PCC) Operations and Multimedia Support . . . . . . . . . . . . . . . . . 427
5.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
5.1.1 Third Party Call Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
5.1.2 Global Call Library and IP Media Library for Third Party Call Control . . . . . . . . . 431
5.1.3 Session Description Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432
5.2 Global Call in Third Party Call Control Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
5.2.1 Initializing the Library in Third Party Call Control Mode. . . . . . . . . . . . . . . . . . . . 433
5.2.2 Interface Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
5.2.3 Device Types and Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442
5.2.4 Using Fast Start and Slow Start Setup in Third Party Call Control Mode . . . . . . 442
5.2.5 Call Transfer Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442
5.2.6 DTMF Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
5.2.7 T.38 Fax and Tone Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
5.3 Session Description Protocol Parser/Generator Example . . . . . . . . . . . . . . . . . . . . . . . . 443
5.4 Message Sequence Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
5.4.1 First Party Call Establishment in Third Party Call Control Mode . . . . . . . . . . . . . 444
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5.4.2 Basic Third Party Call Control Establishment . . . . . . . . . . . . . . . . . . . . . . . . . . . 445
5.4.3 Alternate Third Party Call Control Establishment . . . . . . . . . . . . . . . . . . . . . . . . 448
5.4.4 Modifying the Coder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452
5.4.5 Cancelling a re-INVITE Request. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 456
5.4.6 Receiving an Invalid Answer SDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 457
5.4.7 OPTIONS Request on an Active Dialog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458
5.5 Processing Intraframe Requests for Video Streams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
5.5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
5.5.2 Requesting an I-Frame in SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462
5.5.3 Global Call Example Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462
6 Building Dialogic® Global Call API IP Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
6.1 Header Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
6.2 Required Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
6.3 Required System Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466
7 Debugging Dialogic® Global Call API IP Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467
7.1 Debugging Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467
7.2 Configuring the Logging Facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468
7.2.1 Configuration File Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468
7.2.2 Configuring the gc_h3r Logging Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469
7.2.3 Configuring SIP Stack Logging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 472
7.2.4 Configuring H.323 Stack Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
8 IP-Specific Function Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477
8.1 Dialogic® Global Call API Functions Supported by IP . . . . . . . . . . . . . . . . . . . . . . . . . . . 477
8.2 IP-Specific Dialogic® Global Call API Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484
gc_AcceptModifyCall( ) – accept proposed modification of call characteristics. . . . . . . . 485
gc_CancelWaitCall( ) – cancel previously issued wait call function. . . . . . . . . . . . . . . . . 496
gc_RejectModifyCall( ) – reject proposed modification of call attributes . . . . . . . . . . . . . 498
gc_ReqModifyCall( ) – request modification of call attributes . . . . . . . . . . . . . . . . . . . . . 506
gc_SetAuthenticationInfo( ) – set IP authentication information . . . . . . . . . . . . . . . . . . . 513
gc_SipAck( ) – acknowledge a SIP 200OK message in 3PCC mode . . . . . . . . . . . . . . . 516
gc_SipPrack( ) – send a PRACK message in 3PCC mode . . . . . . . . . . . . . . . . . . . . . . . 520
gc_SipPrackResponse( ) – send a PRACK response message in 3PCC mode . . . . . . . 522
gc_SipSessionProgress( ) – indicate to the originator that call will be answered . . . . . . 524
gc_util_copy_parm_blk( ) – copy the specified GC_PARM_BLK . . . . . . . . . . . . . . . . . . 526
gc_util_find_parm_ex( ) – find a parameter in a GC_PARM_BLK. . . . . . . . . . . . . . . . . . 528
gc_util_insert_parm_ref_ex( ) – insert a GC_PARM_BLK parameter by reference . . . . 531
gc_util_next_parm_ex( ) – retrieve the next parameter in a GC_PARM_BLK. . . . . . . . . 534
INIT_GC_PARM_DATA_EXT( ) – initialize GC_PARM_DATA_EXT structure . . . . . . . . 537
INIT_IP_VIRTBOARD( ) – initialize IP_VIRTBOARD data structure . . . . . . . . . . . . . . . . 539
INIT_IPCCLIB_START_DATA( ) – initialize IPCCLIB_START_DATA structure . . . . . . . 541
8.3 Dialogic® Global Call API Function Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 542
8.3.1 gc_AcceptCall( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 542
8.3.2 gc_AcceptInitXfer( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 544
8.3.3 gc_AcceptXfer( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545
8.3.4 gc_AnswerCall( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546
8.3.5 gc_CallAck( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 547
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8.3.6 gc_Close( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 547
8.3.7 gc_DropCall( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 547
8.3.8 gc_Extension( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 548
8.3.9 gc_GetAlarmParm( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550
8.3.10 gc_GetCallInfo( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 551
8.3.11 gc_GetCTInfo( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 554
8.3.12 gc_GetResourceH( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 554
8.3.13 gc_GetXmitSlot( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 554
8.3.14 gc_InitXfer( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555
8.3.15 gc_InvokeXfer( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555
8.3.16 gc_Listen( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559
8.3.17 gc_MakeCall( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560
8.3.18 gc_OpenEx( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575
8.3.19 gc_RejectInitXfer( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 576
8.3.20 gc_RejectXfer( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 577
8.3.21 gc_ReleaseCallEx( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 578
8.3.22 gc_ReqService( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 578
8.3.23 gc_RespService( ) Variances for IP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 581
8.3.24 gc_SetAlarmParm( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 582
8.3.25 gc_SetConfigData( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 583
8.3.26 gc_SetUserInfo( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 587
8.3.27 gc_Start( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 590
8.3.28 gc_Stop( ) Variances for IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594
8.3.29 gc_UnListen( ) Variances for IP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594
8.4 Dialogic® Global Call API States Supported by IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594
8.5 Dialogic® Global Call API Events Supported by IP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 595
9 IP-Specific Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599
9.1 Overview of Parameter Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599
9.2 Parameter Set Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613
9.2.1 GCSET_CALL_CONFIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 614
9.2.2 IPSET_CALLINFO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 615
9.2.3 IPSET_CONFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618
9.2.4 IPSET_CONFIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618
9.2.5 IPSET_DTMF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 620
9.2.6 IPSET_EXTENSIONEVT_MSK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 622
9.2.7 IPSET_FOIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 622
9.2.8 IPSET_H323_RESPONSE_CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623
9.2.9 IPSET_IPPROTOCOL_STATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623
9.2.10 IPSET_LOCAL_ALIAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 624
9.2.11 IPSET_MEDIA_STATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625
9.2.12 IPSET_MIME and IPSET_MIME_200OK_TO_BYE . . . . . . . . . . . . . . . . . . . . . . 626
9.2.13 IPSET_MIME_ACK_TO_REJECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 627
9.2.14 IPSET_MSG_H245 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 628
9.2.15 IPSET_MSG_Q931 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 628
9.2.16 IPSET_MSG_REGISTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 628
9.2.17 IPSET_MSG_SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629
9.2.18 IPSET_NONSTANDARDCONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 630
9.2.19 IPSET_NONSTANDARDDATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631
9.2.20 IPSET_PROTOCOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631
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9.2.21 IPSET_PROXY_INFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631
9.2.22 IPSET_REG_INFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632
9.2.23 IPSET_RTP_ADDRESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633
9.2.24 IPSET_SDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633
9.2.25 IPSET_SIP_MSGINFO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 634
9.2.26 IPSET_SIP_REQUEST_ERROR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 637
9.2.27 IPSET_SIP_RESPONSE_CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 638
9.2.28 IPSET_SIP_SESSION_TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639
9.2.29 IPSET_SUPPORTED_PREFIXES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 640
9.2.30 IPSET_SWITCH_CODEC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 641
9.2.31 IPSET_TRANSACTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642
9.2.32 IPSET_TUNNELEDSIGNALMSG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643
9.2.33 IPSET_VENDORINFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644
10 IP-Specific Data Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645
GC_PARM_DATA_EXT – retrieved parameter data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 646
IP_ADDR – local IP address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 648
IP_AUDIO_CAPABILITY – basic audio capability information . . . . . . . . . . . . . . . . . . . . 650
IP_AUTHENTICATION – SIP digest authentication data . . . . . . . . . . . . . . . . . . . . . . . . 651
IP_CAPABILITY – basic capability information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 652
IP_CAPABILITY_UNION – parameters for different capability categories . . . . . . . . . . . 654
IP_CONNECT – associate a Media device with a T.38 Fax device . . . . . . . . . . . . . . . . 655
IP_DATA_CAPABILITY – basic data capability information . . . . . . . . . . . . . . . . . . . . . . 656
IP_DTMF_DIGITS – DTMF information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 657
IP_H221NONSTANDARD – H.221 nonstandard data . . . . . . . . . . . . . . . . . . . . . . . . . . 658
IP_PROXY_INFO – outbound proxy information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 660
IP_REGISTER_ADDRESS – gatekeeper registration information . . . . . . . . . . . . . . . . . 661
IP_SIP_TRANSPORT_ADDR – transport layer address information of inbound SIP call 662
IP_TUNNELPROTOCOL_ALTID – TSM protocol alternate ID . . . . . . . . . . . . . . . . . . . . 663
IP_TUNNELPROTOCOL_OBJECTID – tunneled signaling protocol object ID . . . . . . . . 664
IP_VIRTBOARD – information about an IPT board device . . . . . . . . . . . . . . . . . . . . . . . 665
IPCCLIB_START_DATA – IP call control library configuration information. . . . . . . . . . . 671
REQUEST_ERROR – SIP request retry info. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 673
RTP_ADDR – RTP address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 674
SIP_STACK_CFG – SIP stack configuration information . . . . . . . . . . . . . . . . . . . . . . . . 676
SIP_TLS_ENGINE – TLS engine configuration information . . . . . . . . . . . . . . . . . . . . . . 678
11 IP-Specific Event Cause Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 681
11.1 IP-Specific Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 681
11.2 Error Codes When Using H.323 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 685
11.3 Internal Disconnect Reasons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 690
11.4 Event Cause Codes and Failure Reasons When Using H.323 . . . . . . . . . . . . . . . . . . . . 692
11.5 Failure Response Codes When Using SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700
12 Supplementary Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707
12.1 References to More Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 707
12.2 SIP Transaction Timer Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 708
12.3 DNS Configuration for SIP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709
12.4 Called and Calling Party Address List Format When Using H.323 . . . . . . . . . . . . . . . . . 710
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Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 713
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 715
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Figures
1 Typical H.323 Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2 H.323 Protocol Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3 Basic H.323 Network with a Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4 Basic SIP Call Scenario. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5 Dialogic® Global Call API Over IP Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6 Dialogic® Global Call API Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7 Configurations for Binding IPT Boards to NIC IP Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8 Basic Call Setup When Using H.323 or SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9 Basic Call Teardown When Using H.323 or SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10 H.323 Early Media, FastStart Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
11 H.323 Early Media, SlowStart Mode with Early H.245 Enabled . . . . . . . . . . . . . . . . . . . . . . . . 47
12 SIP Early Media, Calling UA Offers SDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
13 SIP Early Media, Calling UA Answers SDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
14 Successful H.450.2 Blind Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
15 H.450.2 Blind Call Transfer Failure - Party B Rejects Call Transfer . . . . . . . . . . . . . . . . . . . . . 53
16 H.450.2 Blind Call Transfer Failure - No Response from Party B . . . . . . . . . . . . . . . . . . . . . . . 54
17 H.450.2 Blind Call Transfer Failure - No Response from Party C . . . . . . . . . . . . . . . . . . . . . . . 55
18 H.450.2 Blind Call Transfer Failure - Party B Clears Primary Call Before Transfer is Completed.
56
19 H.450.2 Blind Call Transfer Failure - Party C is Busy When Transfer Attempted . . . . . . . . . . . 57
20 Successful H.450.2 Supervised Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
21 H.450.2 Supervised Call Transfer Failure - Party C Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . 62
22 H.450.2 Supervised Call Transfer Failure - Party C Rejects the Transfer Request. . . . . . . . . . 63
23 H.450.2 Supervised Call Transfer Failure - Party B Rejects the Transfer Request. . . . . . . . . . 64
24 H.450.2 Supervised Call Transfer Failure - Party B Timeout. . . . . . . . . . . . . . . . . . . . . . . . . . . 65
25 Successful SIP Unattended Call Transfer, Party A Notified with Connection . . . . . . . . . . . . . . 71
26 Successful SIP Unattended Call Transfer, Party A Notified with Ringing . . . . . . . . . . . . . . . . . 72
27 Successful SIP Unattended Call Transfer, Party B Terminates REFER Subscription
prior to Notification of Transferred Call Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
28 Successful SIP Unattended Call Transfer, Party A Clears Primary Call prior to Transfer
Completion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
29 Successful SIP Unattended Call Transfer, Party B Clears Primary Call prior to Transfer
Completion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
30 Successful SIP Attended Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
31 SIP Attended Call Transfer, Recovery from REFER Unsupported . . . . . . . . . . . . . . . . . . . . . . 80
32 SIP Attended Call Transfer, Recovery from URI Not Routable . . . . . . . . . . . . . . . . . . . . . . . . . 81
33 SIP Call Transfer Failure - Party B Rejects Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
34 SIP Call Transfer Failure - No Response from Party B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
35 SIP Call Transfer Failure - No Initial NOTIFY After REFER is Accepted. . . . . . . . . . . . . . . . . . 84
36 SIP Call Transfer Failure - REFER Subscription Expires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
37 SIP Call Transfer Failure - No Response from Party C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
38 SIP Call Transfer Failure - Party B Drops Transferred Call Early . . . . . . . . . . . . . . . . . . . . . . . 87
14 Dialogic® Global Call IP Technology Guide
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39 SIP Call Transfer Failure - Party C is Busy When Transfer Attempted . . . . . . . . . . . . . . . . . . . 88
40 Sending T.38 Fax in an Established Audio Session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
41 Receiving T.38 Fax in an Established Audio Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
42 Sending T.38 Fax Without an Established Audio Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
43 Receiving T.38 Fax Without an Established Audio Session. . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
44 Sending a Request to Switch From T.38 Fax to Audio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
45 Receiving a Request to Switch From T.38 Fax to Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
46 Terminating a Call After a T.38 Fax Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
47 Global Call Devices for H.450.2 Blind Call Transfer or SIP Unattended Transfer . . . . . . . . . . 137
48 Global Call Devices for Supervised Call Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
49 Call Transfer Glare Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
50 SIP MIME Scenario for Normal Call Setup and Teardown . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
51 SIP MIME Scenario for Rejected Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
52 SIP MIME GC_PARM_BLK Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
53 Outbound Proxy Configured for TLS Transport with Both IP and Hostname . . . . . . . . . . . . . . 351
54 Outbound Proxy Configured for TLS Transport with Only IP Address Or Hostname . . . . . . . . 352
55 TLS with “sip:” Source Address and “sip:” Destination Address. . . . . . . . . . . . . . . . . . . . . . . . 353
56 TLS with “sip:” Source Address and “sips:” Destination Address . . . . . . . . . . . . . . . . . . . . . . . 354
57 TLS with “sips:” Source Address and “sip:” Destination Address . . . . . . . . . . . . . . . . . . . . . . . 355
58 TLS with “sips” Source Address and “sips:” Destination Address . . . . . . . . . . . . . . . . . . . . . . 356
59 T.38 Fax Server Support in Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
60 Sending G.711 Fax in an Established Audio Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390
61 Receiving G.711 Fax in an Established Audio Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
62 Sending Protocol Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .410
63 Third Party Call Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428
64 Basic Call Setup When Using Third Party Call Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429
65 Third Party Call Control Setup using re-INVITE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430
66 Global Call over IP Architecture for Third Party Call Control Mode . . . . . . . . . . . . . . . . . . . . . 432
67 First Party Call Control Establishment in Third Party Call Control Mode . . . . . . . . . . . . . . . . . 444
68 Basic Third Party Call Control Establishment (part one) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446
69 Basic Third Party Call Control Establishment (part two). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 447
70 Alternate Third Party Call Control Establishment (part one). . . . . . . . . . . . . . . . . . . . . . . . . . . 449
71 Alternate Third Party Call Control Establishment (part two) . . . . . . . . . . . . . . . . . . . . . . . . . . . 450
72 Alternate Third Party Call Control Establishment (part three) . . . . . . . . . . . . . . . . . . . . . . . . . 451
73 Successfully Modifying the Coder (part one) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453
74 Successfully Modifying the Coder (part two) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454
75 Unsuccessfully Modifying the Coder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
76 Cancelling a Coder Switch using re-INVITE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 456
77 Receiving an Invalid Answer SDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458
78 OPTIONS Request without a MIME Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460
79 OPTIONS Request with a MIME Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
Dialogic® Global Call IP Technology Guide 15
Contents
Tables
1 Summary of Call-Related Information that can be Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
2 Coders Supported for Dialogic® Host Media Processing (HMP) Software . . . . . . . . . . . . . . . 120
3 Capabilities Set by Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
4 Retrievable Call Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
5 Common Header Fields in Outbound SIP Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
6 Common Header Fields in Inbound SIP Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
7 Field-Specific Parameters (Deprecated) for SIP Header Access . . . . . . . . . . . . . . . . . . . . . . 180
8 Parameter IDs for Partial Header Field Access (Deprecated) . . . . . . . . . . . . . . . . . . . . . . . . . 187
9 Global Call Events for Incoming SIP Messages that can Contain MIME Bodies. . . . . . . . . . . 201
10 Global Call Functions for SIP MIME Messages Using IPSET_MIME . . . . . . . . . . . . . . . . . . . 206
11 Deferral of SIP Signaling Messages - Call States and Behavior . . . . . . . . . . . . . . . . . . . . . . . 292
12 Summary of DTMF Mode Settings and Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
13 SIP REGISTER Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
14 Supported Q.931 Message Information Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
15 Supported IEs in Incoming Q.931 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396
16 Common Usage Scenarios Involving Q.931 Message IEs . . . . . . . . . . . . . . . . . . . . . . . . . . . 397
17 Summary of Protocol Messages that Can be Sent with Nonstandard Data . . . . . . . . . . . . . . 405
18 H.225 Messages and Global Call Functions for Sending Tunneled Signaling Messages . . . . 416
19 H.225 Messages and Global Call Events for Receiving Tunneled Signaling Messages . . . . . 418
20 H.225 Messages and Global Call Events for Receiving UU-IE . . . . . . . . . . . . . . . . . . . . . . . . 422
21 IPSET_SDP Parameter Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436
22 Summary of IPSET_SDP Parameters and Outbound SIP Messages . . . . . . . . . . . . . . . . . . . 436
23 Summary of Events That Support Global Call SDP Parameter Sets. . . . . . . . . . . . . . . . . . . . 437
24 Global Call Third Party Call Control Mode Events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440
25 Global Call Third Party Call Control Mode Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
26 Global Call Functions Invalid in Third Party Call Control Mode . . . . . . . . . . . . . . . . . . . . . . . . 441
27 Valid Extension IDs for the gc_Extension( ) Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549
28 gc_InvokeXfer( ) Supported Parameters for H.450.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556
29 H.450.2 ctInitiate Errors Received from the Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556
30 H.450.2 ctIdentify Errors Received From the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557
31 H.450.2 ctSetup Errors Received From the Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557
32 H.450.2 CT Timer Expiry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557
33 gc_InvokeXfer( ) Supported Parameters for SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558
34 SIP Header Fields Settable in REFER Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559
35 Configurable Call Parameters When Using H.323 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 561
36 Configurable Call Parameters When Using SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 563
37 ctIdentify Errors Signaled From gc_RejectInitXfer( ) to the Network . . . . . . . . . . . . . . . . . . . . 577
38 ctInitiate Errors Signaled From gc_RejectXfer( ) to the Network . . . . . . . . . . . . . . . . . . . . . . . 578
39 Registration Information When Using H.323 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 580
40 Registration Information When Using SIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 581
41 Parameters Configurable Using gc_SetConfigData( ) When Using H.323 . . . . . . . . . . . . . . . 584
16 Dialogic® Global Call IP Technology Guide
Contents
42 Parameters Configurable Using gc_SetConfigData( ) When Using SIP . . . . . . . . . . . . . . . . . 586
43 Summary of Parameter Sets and Parameter Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 599
44 GCSET_CALL_CONFIG Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 614
45 IPSET_CALLINFO Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 615
46 IPSET_CONFERENCE Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618
47 IPSET_CONFIG Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 618
48 IPSET_DTMF Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 620
49 IPSET_EXTENSIONEVT_MSK Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 622
50 IPSET_FOIP Parameter Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 622
51 IPSET_H323_RESPONSE_CODE Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623
52 IPSET_IPPROTOCOL_STATE Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 623
53 IPSET_LOCAL_ALIAS Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 624
54 IPSET_MEDIA_STATE Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625
55 IPSET_MIME and IPSET_MIME_200OK_TO_BYE Parameter Sets. . . . . . . . . . . . . . . . . . . . 626
56 IPSET_MIME_ACK_TO_REJECTION Parameter Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 627
57 IPSET_MSG_H245 Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 628
58 IPSET_MSG_Q931 Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 628
59 IPSET_MSG_REGISTRATION Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 628
60 IPSET_MSG_SIP Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629
61 IPSET_NONSTANDARDCONTROL Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 630
62 IPSET_NONSTANDARDDATA Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631
63 IPSET_PROTOCOL Parameter Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 631
64 IPSET_PROXY_INFO Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632
65 IPSET_REG_INFO Parameter Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632
66 IPSET_RTP_ADDRESS Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633
67 IPSET_SDP Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 634
68 IPSET_SIP_MSGINFO Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635
69 IPSET_SIP_REQUEST_ERROR Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 637
70 IPSET_SIP_RESPONSE_CODE Parameter Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 638
71 IPSET_SIP_SESSION_TIMER Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639
72 IPSET_SUPPORTED_PREFIXES Parameter Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 640
73 IPSET_SWITCH_CODEC Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 641
74 IPSET_TRANSACTION Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642
75 IPSET_TUNNELEDSIGNALMSG Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643
76 IPSET_VENDORINFO Parameter Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644
Dialogic® Global Call IP Technology Guide 17
Revision History
This revision history summarizes the changes made in each published version of this document.
Document No. Publication Date Description of Revisions
05-2239-012 May 2014 Incorporated documentation updates.
IP-Specific Parameters chapter : Added IPPARM_SIP_VIA_HDR_REPLACE row to
IPSET_SIP_MSGINFO Parameter Set table in IPSET_SIP_MSGINFO section.
IP-Specific Operations chapter : Updated code example in Retrieving SIP Message
Header Fields section.
05-2239-011 May 2012 Updated for Dialogic® HMP Software for Linux and for Windows. Incorporated
features and documentation updates from Release Updates for Release 3.0, Release
3.1, and Release 4.1.
05-2239-010 March 2008 Updated to correct faulty formatting in some tables.
05-2239-009 November 2007 Made global changes to reflect Dialogic brand.
05-2239-008 August 2006 Updated.
05-2239-007 December 2005 Updated.
05-2239-006 August 2005 Updated.
05-2239-005 April 2005 Updated.
05-2239-004 January 2005 Updated.
05-2239-003 September 2004 Updated.
05-2239-002 April 2004 Updated.
05-2239-001 September 2003 Initial version of document.
18 Dialogic® Global Call IP Technology Guide
Revision History
Dialogic® Global Call IP Technology Guide 19
About This Publication
The following topics provide information about this publication.
•Purpose
•Applicability
•Intended Audience
•How to Use This Publication
•Related Information
Purpose
This publication describes the Dialogic® Global Call API for IP technology as it is implemented in
Dialogic® Host Media Processing (HMP) Software. The Dialogic® Global Call API
implementation in Dialogic® System Release software is documented in a separate set of
documents.
This guide is for users of the Dialogic® Global Call API who are writing applications that use host-
based IP H.323 or SIP technology. The Dialogic® Global Call API provides call control capability
and supports IP Media control capability. This guide provides Dialogic® Global Call API IP-
specific information only and should be used in conjunction with the Dialogic® Global Call API
Programming Guide and the Dialogic® Global Call API Library Reference, which describe the
generic behavior of the Dialogic® Global Call API.
Applicability
This document version is published for Dialogic® Host Media Processing (HMP) Software Release
4.1 and 3.0.
This document may also be applicable to other software releases (including service updates) on
Linux or Windows operating systems. Check the Release Guide for your software release to
determine whether this document is supported.
Intended Audience
This guide is intended for:
•System Integrators
•Independent Software Vendors (ISVs)
•Value Added Resellers (VARs)
20 Dialogic® Global Call IP Technology Guide
About This Publication
•Original Equipment Manufacturers (OEMs)
This publication assumes that the audience is familiar with the Windows or Linux operating system
and has experience using the C programming language.
How to Use This Publication
This guide is divided into the following chapters:
•Chapter 1, “IP Overview”, gives an overview of VoIP technology and brief introductions to the
H.323 and SIP standards for novice users.
•Chapter 2, “Dialogic® Global Call API Architecture for IP”, describes how Dialogic® Global
Call API can be used with IP technology and provides an overview of the architecture.
•Chapter 3, “IP Call Scenarios”, provides some call scenarios that are specific to IP technology,
including scenarios for the call transfer supplementary service.
•Chapter 4, “IP-Specific Operations”, describes how to use Dialogic® Global Call API to
perform IP-specific operations, such as setting call related information, registering with a
registration server, sending and receiving protocol-specific messages, etc.
•Chapter 5, “Third Party Call Control (3PCC) Operations and Multimedia Support”, describes
the Dialogic® Global Call API library’s support for scenarios where the SIP call control
application is not a direct participant in calls.
•Chapter 6, “Building Dialogic® Global Call API IP Applications” provides information for
building Dialogic® Global Call API applications that use IP technology.
•Chapter 7, “Debugging Dialogic® Global Call API IP Applications” provides information for
debugging Dialogic® Global Call API IP applications using RTF logging facilities.
•Chapter 8, “IP-Specific Function Information”, documents functions that are specific to the IP
technology and describes additional functionality or limitations for specific Dialogic® Global
Call API functions when used with IP technology.
•Chapter 9, “IP-Specific Parameters” provides a reference for IP-specific parameter set IDs and
their associated parameter IDs.
•Chapter 10, “IP-Specific Data Structures”, provides reference information for data structures
that are specific to the use of Dialogic® Global Call API with the IP technology.
•Chapter 11, “IP-Specific Event Cause Codes” describes IP-specific event cause codes.
•Chapter 12, “Supplementary Reference Information” provides supplementary information
including technology references and formats for called and calling party addresses for H.323.
Related Information
See the following for additional information:
•http://www.dialogic.com/manuals/ (for Dialogic® product documentation)
•http://www.dialogic.com/support/ (for Dialogic technical support)
•http://www.dialogic.com/ (for Dialogic® product information)
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