SIP User's Manual 126 Document #: LTRT-68806
Mediant 2000 & TP-1610 & TP-260/UNI
5.5.4.3 IP to Trunk Group Routing
The IP to Trunk Group Routing Table is used to route incoming IP calls to groups of E1/T1
B-channelscalled trunk groups. Calls are assigned to trunk groups according to any
combination of the following three options (or using each independently):
îš„ Destination phone prefix
îš„ Source phone prefix
îš„ Source IP address
The call is then sent to the VoIP gateway channels assigned to that trunk group. The
specific channel, within a trunk group that is assigned to accept the call is determined
according to the trunk group's channel selection mode which is defined in the 'Trunk Group
Settings' screen (refer to 'Configuring the Trunk Group Settings' on page 140) or according
to the global parameter ChannelSelectMode (refer to 'Number Manipulation and Routing
Parameters' on page 318).
Note: When a release reason that is defined in the 'Reasons for Alternative IP to Tel
Routing' table is received for a specific IPÆTel call, an alternative Trunk
Group for that call is available. To associate an alternative Trunk Group to an
incoming IP call, assign it with an additional entry in the 'IP to Trunk Group
Routing' table (repeat the same routing rules with a different Trunk Group ID).
For detailed information on the 'Reasons for Alternative Routing Tables', refer
to 'Reasons for Alternative Routing' on page 130.
To use Trunk Groups you must also perform the following:
îš„ Assign a Trunk Group ID to the VoIP gateway's channels in the 'Trunk Group Table'
screen. For information on how to assign a Trunk Group ID to a channel, refer to
'Configuring the Trunk Group Table' on page 138.
îš„ You can configure the 'Trunk Group Settings' table to determine the method in which
new calls are assigned to channels within the Trunk Groups (a different method for
each Trunk Group can be configured). For information on how to enable this option,
refer to 'Configuring the Trunk Group Settings' on page 140. If a Channel Select Mode
for a specific Trunk Group isn't specified, then the global Channel Select Mode
parameter (defined in the 'General Parameters' screen under 'Advanced Parameters')
applies.
You can also configure the IP to Trunk Group Routing table using the ini file parameter
PSTNPrefix (refer to 'Number Manipulation and Routing Parameters' on page 318).
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