Voice Gateway Network Topology; Gr-303/Tr008 Mode - Alcatel-Lucent 7302 Information Manual

Intelligent services access manager

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Server (s) DHCP,

application, FTP etc.,

Class 5 PSTN

The G6 voice gateway mode supports two submodes as follows:

GR-303/TR008 mode for ANSI H.248 support

V5 mode for ETSI H.248 support

The G6 voice gateway supports both GR-303 and TR008 interfaces with the Class 5

switch. In this mode, two types of message flows typically occur between the voice

gateway and the ONT: H.248/Megaco signaling and ABCD-bit loop-start signaling.

H.248/Megaco message-based signaling is used to set up and tear down calls. It sets

up the bearer path and DS0 connection.

ABCD-bit loop-start signaling controls the analog interface and is passed in the

bearer channel using RFC 2833 protocol. The G6 voice gateway converts the 2-bit

AB signaling used by the TR008 interface to the 4-bit ABCD loop-start signaling

used by the ONT.

Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02

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ONT Product Information Guide

Figure 5-1 Voice gateway network topology

Management channel

5 — VoIP overview

November 2013