Figure 3-77: Reasons For Alternative Routing - AudioCodes Mediant 2000 User Manual
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3.4.7.4.8 Reasons for Alternative Routing
The 'Reasons for Alternative Routing' page includes two groups - IP to Tel Reasons and Tel
to IP Reasons. Each group allows you to define up to four different release reasons. 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 release reason for IP-to-Tel calls is provided in Q.931 notation. The
release reason for Tel-to-IP calls is provided in SIP 4xx, 5xx, and 6xx response codes. For
Tel-to-IP calls, an alternative IP address is provided; for IP-to-Tel calls an alternative Trunk
Group is provided. Refer to ''Tel to IP Routing Table'' on page
defining an alternative IP address; refer to ''IP to Trunk Group Routing'' on page
information on defining an alternative Trunk Group.
You can use the 'Reasons for Alternative Routing' page for the following example
scenarios:
Tel-to-IP calls: when there is no response to an INVITE message (after INVITE
retransmissions), the device issues an internal 408 'No Response' implicit release
reason.
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
DefaultReleaseCause in ''Advanced Parameters'' on page 151.
Notes:
To configure the reasons for alternative routing, take these 5
steps:
Open the 'Reasons for Alternative Routing' page (Configuration tab > Protocol
1.
Configuration menu > Routing Tables submenu > Reasons for Alternative
Routing page item).
In the 'IP to Tel Reasons' group, select up to four different call failure reasons that
2.
invoke an alternative IP-to-Tel routing.
SIP User's Manual
•
The reasons for alternative routing for Tel-to-IP calls only apply when a
Proxy isn't used.
•
For Tel-to-IP calls, the device sends the call to an alternative route only
after the call has failed and the device has subsequently attempted twice
to establish the call unsuccessfully.
•
You can also configure alternative routing using the ini file table
parameters AltRouteCauseTel2IP and AltRouteCauseIP2Tel (refer to
''Number Manipulation and Routing Parameters'' on page 313).
Figure 3-77: Reasons for Alternative Routing Page
188
Mediant 2000
175
for information on
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Document #: LTRT-68808
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