AudioCodes Mediant 4000 SBC, User Manual

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CHAPTER 28 Advanced SBC Features
Mediant 4000 SBC | 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:
Enabling Survivability Display on Aastra IP Phones
If the SBC device is deployed in a 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
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