Version 6.2 175 February 2011
SIP User's Manual 3. Web-Based Management
Release reason for Tel-to-IP calls: Reason for call release on the IP side, 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, see
''Configuring Outbound IP Routing Table'' on page 165. This
call release reason type
can be configured, for example, 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 plays a tone to the endpoint whenever an alternative route is used. This tone is
played for a user-defined time, configured by the AltRoutingToneDuration parameter.
Notes:
• To enable alternative routing using the IP-to-Tel routing table, set 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 (see
''Number Manipulation and Routing Parameters'' on page 836).
¾ To configure reasons for alternative routing:
1. Open the 'Reasons for Alternative Routing' page (Configuration tab > VoIP menu >
GW and IP to IP submenu > Routing submenu > Alternative Routing Reasons).
Figure 3-86: Reasons for Alternative Routing Page
2. In the 'IP to Tel Reasons' group, select up to five different call failure reasons that
invoke an alternative IP-to-Tel routing.
3. In the 'Tel to IP Reasons' group, select up to five different call failure reasons that
invoke an alternative Tel-to-IP routing.
4. Click the Submit button to save your changes.
5. To save the changes to flash memory, see ''Saving Configuration'' on page 336.
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