5 — VoIP overview
Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02 November 2013 5-5
3FE 55873 AAAA TCZZA Edition 01
ONT Product Information Guide
Figure 5-1 Voice gateway network topology
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
GR-303/TR008 mode
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.
PSTN
gateway
Softswitch
Signaling
channel
BRAS
IP cloud
PSTN
cloud
L2
Ethernet
cloud
POTS
phone
IP phone
POTS
phone
IP
phone
RJ11
RJ45
Class 5 PSTN
switch
21708
ONT
Server (s) DHCP,
application, FTP etc.,
Management channel
ISAM
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