SIP User's Manual 556 Document #: LTRT-12804
Mediant 800 MSBG
d. Click Apply.
Figure 8-70: IP-to-IP Routing Rules
8.4.10.2 Survivability and Alternative Routing
This section provides an example for configuring SBC Survivability for LAN users. This
example is based on the scenario described in ''General SBC Setup'' on page 546.
In normal operation, the I
P-PBX serves the enterprise's IP phones (calls are routed to the
IP-PBX). The SBC Survivability feature ensures the continuity (survivability) of calls even if
the Proxy server (in our example, the hosted IP-PBX) does not respond or the WAN is
unavailable. Therefore, SBC Survivability feature offers an alternative routing mechanism.
It does this by utilizing the device's internal registration database to route calls to registered
users.
The survivability feature provides the following survivability mechanisms:
If the IP-PBX does not respond (WAN failure), the SBC application ensures that calls
between IP phones within the enterprise's LAN are maintained.
If there is a WAN failure and the called destination is not a registered user (not
registered in the device's database), the calls are routed to the PSTN.
You can view registered users in the device's database by accessing the 'SAS/SBC
Registered Users' page (Status & Diagnostics tab > VoIP Status menu > SAS/SBC
Registered Users).
In addition to the configuration described in ''General SBC Setup'' on page 546, this
example requ
ires the following additional configurations:
Enable the Keep-Alive feature for the Proxy Set ID# 1 belonging to the IP-PBX.
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