Version 6.4 279 March 2012
SIP User's Manual 18. GW and IP to IP
18.4.3 Configuring Inbound IP Routing Table
The Inbound IP Routing Table page allows you to configure up to 24 inbound call routing
rules:
For IP-to-IP routing: identifying IP-to-IP calls and assigning them to IP Groups
(referred to as Source IP Groups). These IP-to-IP calls, now pertaining to an IP Group,
can later be routed to an outbound destination IP Group (see Configuring Outbound IP
Routing Table on page 271).
For IP-to-Tel routing: routing incoming IP calls to Trunk Groups. The specific channel
pertaining to the Trunk Group to which the call is routed is determined according to the
Trunk Group's channel selection mode. The channel selection mode can be defined
per Trunk Group (see 'Configuring Trunk Group Settings' on page 253), or for all
Trunk Groups using the global parameter ChannelSelectMode.
This table provides two main areas for defining a routing rule:
Matching Characteristics: user-defined characteristics of the incoming IP call are
defined in this area. If the characteristics match a table entry, the rule is used to route
the call. One or more characteristics can be defined for the rule:
• Source and destination Request-URI host name prefix
• Source (calling) and destination (called) telephone number prefix and suffix
• Source IP address (from where the call is received)
Destination: user-defined destination. If the call matches the characteristics, the
device routes the call to the defined destination:
• Trunk Group
• Source IP Group
The device also supports the following alternative routing methods if the Trunk Group used
in the routing rule is unavailable:
When a call release reason that you have configured for alternative IP-to-Tel routing is
received for a specific IP-to-Tel call, the device re-routes the call to an alternative
Trunk Group. This is done by configuring an additional routing rule with the same call
characteristics but different Trunk Group ID. For more information on IP-to-Tel
alternative routing, see "Alternative Routing to Trunk upon Q.931 Call Release Cause
Code" on page 287.
The device can re-route (i.e., call redirection) IP-to-Tel calls to an alternative IP
destination, using SIP 3xx responses. For more information, see "Alternative Routing
to IP Destinations upon Busy Trunk" on page 288.
Note: You can also configure the Inbound IP Routing Table using the ini file table
parameter PSTNPrefix (see 'Number Manipulation Parameters' on page 750).
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