3Com VCX V7122/SIP VoIP Gateway User Manual
53
Table 15
Using SIP Gateway Features
Feature Parameter
Sheet of Excel
Utility
Value
Using Trunk Groups
TrunkGroup_x = <Trunk port>/a-b,
<starting number>
PSTNPrefix = <prefix>, <Trunk Group
ID>
AddTrunkGroupAsPrefix
This feature defines groups of
Gateway channels, called trunk
groups, for routing outgoing IP
Æ
Tel
calls. For example:
TrunkGroup_1
=
0/1-31,1000
TrunkGroup_1
=
1/1-31,2000
TrunkGroup_2
=
2/1-31,3000
In this example, trunk group number 1
is composed of B-channels from the
first and the second E1 spans.
For T1 spans range of 1–24 is usually
used, such as 0/1–24,1000.
To use the Trunk group feature, it is
required to define routing rules using
the PSTNPrefix parameter.
The routing IP
Æ
Tel rules define for
each called number, according to its
prefix, the Trunk Group ID to where
the call is sent. For example:
PSTNPrefix = 101,1
An outgoing IP
Æ
Tel call with called
number starting with 101 is allocated
to a free channel in Trunk group
number 1.
Add Trunk Group ID, as a prefix, to
destination number,
(AddTrunkGroupAsPrefix = 1) for Tel
Æ
IP calls. This feature enables users
to differentiate incoming IP calls and
apply routing and number
manipulation rules, based on the trunk
group from where the call arrived.
When using Trunk groups the
ChannelList parameter is ignored.
General
Range
1– 99
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