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Document History
Revision#
Version Date
Comments
01
July 2009
Initial Release
01
June 2009
Comments Incorporated
02
June 2015
Updated for release 5.10.2
Refer to www.dialogic.com for product updates and for information about support policies, warranty
information, and service offerings.
ControlSwitch (v.5.10.2) SIP Local Number Portability
Dialogic Inc. Proprietary Page 3
Table of Contents
INTRODUCTION ............................................................................................................................................ 4 1.
1.1 Overview ..................................................................................................................................................... 4
1.2 System Architecture .................................................................................................................................... 4
SIP LNP SERVER INTERACTION ...................................................................................................................... 6 2.
2.1 Request to LNP Server ................................................................................................................................. 6
2.2 Possible response formats .......................................................................................................................... 6
Format 1.................................................................................................................................................. 6 2.2.1
Format 2.................................................................................................................................................. 7 2.2.2
Format 3.................................................................................................................................................. 7 2.2.3
Format 4.................................................................................................................................................. 7 2.2.4
2.3 No Response from the LNP Server .............................................................................................................. 8
2.4 Possible Response Formats ......................................................................................................................... 8
LSG CALL FLOW ............................................................................................................................................ 10 3.
CDR INFORMATION ..................................................................................................................................... 11 4.
4.1 Call Tracing and Routing Dips .................................................................................................................... 11
ALARMS AND REPORTS ............................................................................................................................... 12 5.
5.1 Alarms ....................................................................................................................................................... 12
5.2 Reports ...................................................................................................................................................... 12
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Introduction 1.
1.1 Overview
Local Number Portability (LNP) is deployed world-wide, allowing the end-users to keep their existing
phone number if they either move or switch carriers. This involves storing of the Network Routing
Number (NRN) that is a different number from the user’s directory number (DN) in the SCP. When a
switch (this could be an originating, transit, or a terminating switch) determines that a number is
ported, it attempts to retrieve the NRN for the DN. NRN is used to route the call towards the correct
destination. One way of doing this is to query an SCP (SN) by using the SIP protocol – a simple
transaction with an INVITE to the SN results in a 3xx redirection with the LNP information. The LSG (CS
element) provides a SIP transaction-based interface, for querying the SIP service nodes (SN), in IP
network.
For SIP LNP configuration, refer to ControlSwitch Advanced Elements and Services User's Manual,
section SIP LNP Configuration.
1.2 System Architecture
The LNP Signaling Gateway (LSG) is an integral component of the CS, used when an external SIP SN
needs to be queried.
The SIP LNP solution involves the following elements:
Call Processing Element (CCE). IP/TDM Call Processing element.
Service Execution Element (SEE). After dipping with the Policy Engine (PE), the SEE interacts
with the LSG that queries the SCP.
Policy Engine (PE). Provides the service trigger information for identifying whether or not there
is a need for SIP-based SCP interaction.
LNP SIP Gateway (LSG): Communicates the transaction messages between the CS and SCP.
SIP LNP Server: External SCP which provides SIP interface to access LNP database.
EMS: EMS manages all the elements of the CS. It provisions the PE with routing information
and other necessary mappings required within the system and allows the dynamic provisioning
of the service nodes.
LSG interacts with SEE for providing the LNP information and with EMS for management purposes.
When an incoming call is forwarded to the PE for route determination, if the PE finds that the called
party belongs to a ported number range and that is being served by a SIP SN, it instructs the SEE to
make the LNP dip. SEE sends the request to the LSG which interacts with the SN and obtains the LNP
information. The call processing continues with the new information.
The following figure depicts the system architecture.
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Figure 1: System Architecture
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SIP LNP Server Interaction 2.
Figure 2: SIP Communication between CS and the SIP Server
2.1 Request to LNP Server
INVITE sip:[email protected]:5061;user=phone SIP/2.0
Call-ID: [email protected]
From: <sip:[email protected]:3560;user=phone>;tag=30705
To: <sip:[email protected]:5061;user=phone>
CSeq: 1 INVITE
Via: SIP/2.0/UDP 10.5.30.239:3560;branch=z9hG4bK-600000006-a051eef-7
Contact: sip:54321001@10.5.30.239:3560
Supported: timer,100rel
Max-Forwards: 70
2.2 Possible response formats
CS supports the following formats of ‘301/302’ response messages.
Format 1 2.2.1
Case: ‘sip:’ url SCP Dip done and Number ported:
SIP/2.0 301 Moved Permanently /302 Moved Temporarily
Via: SIP/2.0/UDP 10.5.30.239:3560;branch=z9hG4bK-600000006-a051eef-7
From: <sip:[email protected]:3560;user=phone>;tag=30705
To: <sip:[email protected]:5061;user=phone>;tag=583330932
CSeq: 1 INVITE
Contact: <sip: 54321001;rn=1408987654;[email protected]:9090;user=phone>
Content-Length: 0
Ported number should be presented in “rn=” parameter.
CS Supports both formats for npdi ie. “npdi=yes” or npdi
For ‘sip:’ url rn and npdi should be present in User part
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Format 2
2.2.2
Case: ‘tel url’ SCP Dip done and Number ported:
SIP/2.0 301 Moved Permanently/302 Moved Temporarily
Via: SIP/2.0/UDP 10.5.20.87:3020;branch=z9hG4bK-400000004-a051457-5
From: <sip:[email protected]:3020;user=phone>;tag=8684
To: <sip:[email protected]:9090;user=phone>;tag=4
CSeq: 1 INVITE
Contact: <tel:+14088888888;rn=14089876543; npdi>
Content-Length: 0
The following flow shows SEE interaction where the service node does not have ported information for
the ported called number.
Figure 3: SIP Communication between CS and the SIP Server (number not ported)
Format 3 2.2.3
Case: SCP Dip done and Number not ported: (npdi, no rn)
SIP/2.0 301 Moved Permanently /302 Moved Temporarily
Via: SIP/2.0/UDP 10.5.30.239:3560;branch=z9hG4bK-600000006-a051eef-7
From: <sip:[email protected]:3560;user=phone>;tag=30705
To: <sip:[email protected]:5061;user=phone>;tag=583330932
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: <sip: 54321001;[email protected]:9090;user=phone>
Content-Length: 0
Format 4 2.2.4
Case: SCP Dip done and Number not found
SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 10.5.20.87:3020;branch=z9hG4bK-500000005-a051457-6
From: <sip:[email protected]:3020;user=phone>;tag=8550
To: <sip:[email protected]:9090;user=phone>;tag=1
CSeq: 1 INVITE
Content-Length: 0
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2.3 No Response from the LNP Server
The following shows the SEE interaction when SEE terminates the transaction early/SCP
unreachable/SCP response not received.
Figure 4: SIP Communication between the CS and the SIP Sever (no response)
2.4 Possible Response Formats
RSIP Response
npdi
Rn
Use Case
Msg to SEE
Destination Routing Addr
3xx
present
present
Number ported
Connect
“rn” as received in contact hdr
of 3xx (Format 1/ Format 2
present
absent
Number not ported
Connect/Release
(Note1)
“user” field of UserPart from the
contact header (Format 3)
absent
present
Other services (such
as free phone)
Connect
“rn” as received in contact hdr
of 3xx
absent
absent
Other services as
(such as free phone)
Connect
“user” field of UserPart from the
contact header
404
-
-
Number not ported
Connect/
Release
(Note1)
Set it to same number as
received in the InitialDP request
(Called Party Number) (Format
4)
4xx, 5xx, 2xx
-
-
Error
Abort
None
6xx
-
-
Error
Connect
Set it to same number as
received in the InitialDP request
(Called Party Number)
Internal Error
-
-
Error
Abort
None
Basic Call Flow:
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Figure 5: Message Flow
1. Call Ingress in CS through IP/TDM network
2. CCE sends Call Info to SEE
3. SEE dips to PE to find out Services associated with Incoming Call
4. PE based on Trunk Group (TG) Service Trigger plan executes policies associated with Incoming call,
identifies whether or not there is need of SIP based SCP Interaction and send response back with
LSG details to SEE.
5. SEE applies DA rule to called number if applicable and sends Incoming call Info to LNP.
6. LNP sends SIP INVITE message with Incoming call information to SCP
7. If number is ported then SCP sends ‘301/302’ response with rn and npdi parameters.
8. LSG passes routing number to SEE.
9. SEE sends Routing number, Original Called Party Number to PE.
10. PE does Post processing, applies policies based on New routing number sends back final Egress TG
list to SEE. Original Called Party Number is copied into GAP parameter.
11. SEE updates Forward Indicator based on SCP response and sends call to outgoing CCE
12. CCE sends call out on IP/TDM network.
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LSG Call Flow 3.
Figure 6: Call Flow
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CDR Information 4.
CS records the LNP events in CDR. If the dip succeeds, CS receives ‘301/302’ message with RN and NPDI,
and records following information:
<SVC ID="32" SUCC="1" ServiceNodeId="5" ServiceCategory="LNP"
TcapGatewayId="691"><Time>2010-10-19+01:23:38.023</Time>
If the operation fails the following information is recorded:
<SVC ID="32" SUCC="0" ServiceNodeId="5" ServiceCategory="LNP"
TcapGatewayId="691"><Time>2010-10-19+01:23:38.023</Time>
The following scenarios list the unsuccessful dip caes:
If Veraz CS receives 4xx/5xx/6xx message for INVITE
INVITE request time out
Veraz CS could not reach to SCP
4.1 Call Tracing and Routing Dips
When a call has been triggered for tracing and it involves routing dips, all messages that are required
are viewable by the operator. The following messages are traced:
The routing dip request sent by SEE
The SIP request sent out by LNP SIP Gateway
The SIP responses or timeout in the LNP SIP Gateway
The routing dip response received by SEE
LSG sends the following messages/information in the trace messages:
The Service Node ID to which the SIP request is being sent to
The content of SIP requests and responses
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Alarms and Reports 5.
5.1 Alarms
LSG supports the following alarms:
General Life cycle (Stat up, Shutdown, Disable) alarms related to CS element
CPU overload alarm
Process related alarms: Queue delay
5.2 Reports
The reports are available on daily or hourly basis for the SIP LNP service.
Number of Calls Requiring LNP dips
Number of Ported Calls. SCP returned a positive response with the new RN.
Total Dips. Total number of attempts made (some attempts may be failures, some calls may
have done multiple dips).
END of DOCUMENT
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