SIP User's Manual 132 Document #: LTRT-65412
MP-11x & MP-124
Alternative routing (using this table) is commonly implemented when there is no
response to an INVITE message (after INVITE retransmissions). The device then
issues an internal 408 'No Response' implicit release reason. If this reason is included
in the 'Reasons for Alternative Routing' table, the device immediately initiates a call to
the redundant destination using the next matched entry in the 'Tel to IP Routing' table.
Note that if a domain name in this table is resolved into two IP addresses, the timeout
for INVITE retransmissions can be reduced by using the parameter 'Number of RTX
Before Hotswap'.
Notes:
• If the alternative routing destination is the device itself, the call can be
configured to be routed back to the PSTN. This feature is referred to as
'PSTN Fallback', meaning that if poor voice quality occurs over the IP
network, the call is routed through the legacy telephony system (PSTN).
• Tel-to-IP routing can be performed before or after applying the number
manipulation rules. To control when number manipulation is performed,
use the 'Tel to IP Routing Mode' (or RouteModeTel2IP ini file) parameter,
described in the table below.
• You can also configure the 'Tel to IP Routing' table using the ini file table
parameter Prefix (refer to ''Number Manipulation and Routing
Parameters'' on page 328).
¾ To configure the Tel to IP Routing table:
1. Open the 'Tel to IP Routing' page (Configuration tab > Protocol Configuration menu
> Routing Tables submenu > Tel to IP Routing page item).
Figure 3-77: Tel to IP Routing Page
2. From the 'Routing Index' drop-down list, select the range of entries that you want to
add.
3. Configure the Tel to IP Routing table according to the table below.
4. Click the Submit button to save your changes.
5. To save the changes to flash memory, refer to ''Saving Configuration'' on page 167.
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