Web-based Configuration Manual
H3C VG Series Voice Gateways Chapter 1
Introduction to VG
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Chapter 1 Introduction to VG
H3C VG is a voice gateway device (hereinafter referred to as VG). It is developed by
Huawei-3Com Technology Co., Ltd. as a new generation of voice and fax access
equipment for various sectors and SOHO (small office and home office).
The VG is designed to access voice and fax signal, and convert the analog voice and
fax signal to digital signal, then packetize the digital signal into IP packets, and send the
IP packets to the IP network through an Ethernet interface at the network side.
Additionally, some models, such as VG 10-40/10-41, can implement broadband access
of digital service, and provide an Ethernet interface at the user side to connect a PC or
a LAN.
The VG is cost-effective, for it integrates various IP telephone features, such as voice
over IP (VoIP), fax over IP (FoIP), call control, resource management, and
maintenance management, provides multiple coding/decoding modes, and supports
dynamic address acquisition.
The VG is compliant with H.323 of ITU-T and guarantees quality of voice and fax data
transmission over the IP network through high-performance DSP chips,
coding/decoding algorithms with a high compression ratio, echo cancellation, mute
compression, comfortable noise, jitter prevention, and relevant security and QoS
features.
The VG supports fast and non-fast connection to implement outband transmission of
the DTMF (dual tone multifrequency) code and provide busy tone detection,
abbreviated dialing, private lines, outgoing prefix, and some special services of
program-controlled switch (such as do-not-disturb, call forward on busy, alarm call, and
multi-line group access).
At present, the VG provides Ethernet interfaces to connect with LAN and WAN, and
FXS (foreign exchange station) interfaces and FXO (foreign exchange office) interfaces
to connect with ordinary telephone sets or PBX (private branch exchange).
Apart from providing SOHO users with IP telephone and fax services, the VG can
implement simultaneous transmission of voice and data by connecting with LAN
through Ethernet interfaces and thus make better use of the resources.