♦ The 'Destination Type' field is set to Hunt Group, which is specifically used
for call center survivability.
♦ The 'Destination IP Group ID' field is set to the IP Group of the call center
agents.
The figure below displays a routing rule example, assuming IP Group "1" represents
the TDM Gateway and IP Group "3" represents the call center agents:
Figure 30-13: Routing Rule Example for Call Center Survivability
30.9.4 Survivability Mode Display on Aastra IP Phones
If the SBC device is deployed in an Enterprise network with Aastra IP phones and
connectivity with the WAN fails, the device provides call survivability by enabling
communication between IP phone users within the LAN enterprise. In such a scenario, the
device can be configured to notify the IP phones that it is currently operating in Survivability
mode. When this occurs, the Aastra IP phones display the message, "StandAlone Mode"
on their LCD screens. This feature is enabled by setting the
SBCEnableAASTRASurvivabilityNotice parameter to 1.
When this feature is enabled and the SBC device is in Survivability mode, it responds to
SIP REGISTER messages from the IP phones with a SIP 200 OK containing the following
XML body:
Content-Type: application/xml
<?xml version="1.0" encoding="utf-8"?>
<LMIDocument version="1.0">
<LocalModeStatus>
<LocalModeActive>true</LocalModeActive>
<LocalModeDisplay>StandAlone Mode</LocalModeDisplay>
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