Enabling Survivability Display On Aastra Ip Phones - AudioCodes Mediant 4000 SBC User Manual

User's Manual
3. In the SBC IP-to-IP Routing table (see ''Configuring SBC IP-to-IP Routing Rules'' on
page 499), add the following IP-to-IP routing rules:
•
For normal operation:
♦
♦
•
For call survivability mode: Routing from TDM Gateway to call center agents. This
configuration is unique due to the following settings:
♦
♦
♦
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 29-14: Routing Rule Example for Call Center Survivability

29.8.4 Enabling Survivability 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, "Stand Alone Mode"
on their LCD screens.
If you enable the feature and the 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:
Version 7.2
Routing from TDM Gateway to Application server.
Routing from Application server to call center agents.
The 'Source IP Group' field is set to the IP Group of the TDM Gateway.
The 'Destination Type' field is set to Hunt Group, which is specifically used
for call center survivability.
The 'Destination IP Group' field is set to the IP Group of the call center
agents.
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29. Advanced SBC Features
Mediant 4000 SBC