Nortel Networks Mediant TP-1610 SIP - Manual (Page 50)

Mediant 2000 SIP
Mediant 2000 SIP User’s Manual 50 Document #: LTRT-72504
Alternative Routing’ table, the gateway 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 to two IP addresses, the timeout for Invite retransmissions can
be reduced by using the parameter ‘Number of RTX Before Hotswap’.
Note: If the alternative routing destination is the gateway itself, the call can be configured to
be routed back to PSTN. This feature is referred to as "PSTN Fallback", meaning that if
sufficient voice quality is not available over the IP network, the call is routed through legacy
telephony system (PSTN).
Tip: Tel to IP routing can be performed either before or after applying the number
manipulation rules. To control when number manipulation is done, set the
RouteModeTel2IP parameter. For information on this parameter, refer to refer
to
Table 6-5 on page 115 .
To configure the Tel to IP Routing table, take these 6 steps:
1. Open the ‘Tel to IP Routing’ screen (Protocol Management menu > Routing Tables
submenu > Tel to IP Routing option); the ‘Tel to IP Routing’ screen is displayed (shown in
Figure 5-5 ).
2. In the ‘Tel to IP Routing Mode’ field, select the Tel to IP routing mode (refer to Table 6-5 ).
3. In the ‘Routing Index' drop-down list, select the range of entries that you want to edit.
4. Configure the Tel to IP Routing table according to Table 5-3 .
5. Click the Submit button to save your changes.
6. To save the changes so they are available after a power fail, refer to Section 5.12 on page
84 .
Figure 5-5: Tel to IP Routing Table Screen
Table 5-3: Tel to IP Routing Table
Parameter Description
Destination Phone Prefix Each entry in the Destination Phone Prefix fields represents a called telephone
number prefix. The prefix can be 1 to 19 digits long. An asterisk (*) represents all
numbers.
Source Phone Prefix Each entry in the Source Phone Prefix fields represents a calling telephone number
prefix. The prefix can be 1 to 19 digits long. An asterisk (*) represents all numbers.