Enabling Survivability Display On Aastra Ip Phones - AudioCodes Mediant 500L User Manual

User's Manual
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 39-9: Routing Rule Example for Call Center Survivability

39.8.4 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:
Content-Type: application/xml
<?xml version="1.0" encoding="utf-8"?>
<LMIDocument version="1.0">
<LocalModeStatus>
<LocalModeActive>true</LocalModeActive>
<LocalModeDisplay>StandAlone Mode</LocalModeDisplay>
</LocalModeStatus>
</LMIDocument>

To enable survivability display on Aastra phones:
1. Load an ini file to the device that includes the following parameter setting:
SBCEnableSurvivabilityNotice = 1
Version 7.2 763 Mediant 500L Gateway & E-SBC
39. Advanced SBC Features