Figure 5-1 Voice Gateway Network Topology - Alcatel-Lucent 7330 Product Information Manual

Server (s) DHCP,
application, FTP etc.,
IP phone
PSTN
gateway
PSTN
cloud
POTS
phone
Class 5 PSTN
switch
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.
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a
3FE 54199 AAAA TCZZA

Figure 5-1 Voice gateway network topology

Management channel
IP cloud
L2
Ethernet
cloud
Edition 01 ONT Product Information Guide
Softswitch
Signaling
channel
BRAS
ISAM
March 2011
5 — VoIP overview
RJ11
POTS
phone
RJ45
ONT
IP
phone
21708
5-5