HP Media Gateways G250 - Manual (Page 37)

Issue 5 June 2008 37
Chapter 3: Summary of services
The Branch Gateway (G250 or G350) offers various services, which are described in Media
gateway services on page 37, LAN services on page 45, and WAN services on page 47.
Media gateway services
The Avaya G250 and Avaya G350 Media Gateways provide a telephone exchange service,
supporting the connection of various types of telephones and outside telephone lines.
Telephones and lines are connected to the G250/G350 via ports and media modules on the
chassis. Different media modules provide access ports for different types of telephones and
lines.
Telephony services are controlled by a media gateway controller (MGC) running Avaya
Communication Manager (CM) call processing software. You can use the Avaya CM to
configure many advanced telephone exchange functions. For more information, see the
Administrator’s Guide for Avaya Communication Manager, 555-233-506.
This section describes the services the G250/G350 provides as a media gateway. All services
are supported by both the G250 and the G350 except where otherwise specified.
Voice over IP (VoIP)
The Avaya G250 and Avaya G350 Media Gateways feature a VoIP engine that provides voice
services over IP data networks. The G250/G350 allows you to use many types of telephones
and trunks that do not directly support VoIP. The G250/G350 translates voice and signalling
data between VoIP and the system used by the telephones and trunks, as follows: Avaya media
modules convert the voice path of traditional circuits such as analog trunk, T1/E1, and DCP to a
TDM bus inside the G250/G350. The VoIP engine then converts the voice path from the TDM
bus to a compressed or uncompressed and packetized VoIP on an Ethernet connection.
Both the G250 and the G350 provide VoIP services over the LAN and WAN. The G350 supports
the G.711 codec for up to 32 concurrent calls and the G.729 codec for up to 16 concurrent calls.
The G250-Analog and G250-BRI support both the G.711 and the G.729 codec, for a total of 10
concurrent calls. The G250-DCP and G250-DS1 support both the G.711 and the G.729 codec,
for a total of 16 concurrent calls.