AudioCodes mediapack MP-500 User Manual page 210

3.4.5.10.6 Configuring Reasons for Alternative Routing
The 'Reasons for Alternative Routing' page allows you to define up to four different call
release (termination) reasons for IP-to-Tel call releases and for Tel-to-IP call releases. If a
call is released as a result of one of these reasons, the device tries to find an alternative
route for that call. The device supports up to two different alternative routes.
The release reason for IP-to-Tel calls is provided in Q.931 notation. As a result of a release
reason, an alternative Hunt Group is provided. For defining an alternative Hunt Group, refer
to ''Configuring the IP to Trunk Group Routing'' on page 206.
The release reason for Tel-to-IP calls is provided in SIP 4xx, 5xx, and 6xx response codes.
As a result of a release reason, an alternative IP address is provided. For defining an
alternative IP address, refer to ''Configuring the Tel to IP Routing Table'' on page 201.
Call release reasons can be configured, for example, for the following scenarios:
IP-to-Tel calls: when the destination is busy and release reason #17 is issued or for
other call releases that issue the default release reason (#3) (refer to the parameter
DefaultReleaseCause).
Tel-to-IP calls: when there is no response to an INVITE message (after INVITE re-
transmissions), the device issues an internal 408 'No Response' implicit release
reason.
The device also plays a tone to the endpoint whenever an alternative route is used. This
tone is played for a user-defined time (using the ini file parameter AltRoutingToneDuration -
refer to Configuring General Routing Parameters on page 200).
Notes:
SIP User's Manual
•
To enable alternative routing using the IP-to-Tel routing table, configure
the parameter RedundantRoutingMode to 1 (default).
•
The reasons for alternative routing for Tel-to-IP calls also apply for
Proxies (if the parameter RedundantRoutingMode is set to 2).
•
You can also configure alternative routing using the ini file table
parameters AltRouteCauseTel2IP and AltRouteCauseIP2Tel (refer to
''Number Manipulation and Routing Parameters'' on page 408).
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MP-500 MSBG
Document #: LTRT-12801