AudioCodes Mediant 500 MSBR, User Manual

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Version 7.2 735 Mediant 500 MSBR
User's Manual 41. Advanced SBC Features
41.5.1 Enabling Auto-Provisioning of Subscriber-Specific Information of
BroadWorks Server for Survivability
This feature enables SBC user registration for interoperability with BroadSoft BroadWorks
server to provide call survivability in case of connectivity failure with the BroadWorks
server, for example, due to a WAN failure. The feature enables local users to dial a local
extension (or any other configured alias) that identifies another local user, in survivability
mode.
In normal operation, when subscribers (such as IP phones) register with the BroadWorks
server through the device, the device includes the SIP Allow-Events header in the sent
REGISTER message. In response, the BroadWorks server sends the device a SIP 200 OK
containing an XML body with subscriber information such as extension number, phone
number, and URIs (aliases), as shown in the example below:
<?xml version="1.0" encoding="utf-8"?>
<BroadsoftDocument version="1.0" content="subscriberData">
<phoneNumbers>
<phoneNumber>2403645317</phoneNumber>
<phoneNumber>4482541321</phoneNumber>
</phoneNumbers>
<aliases>
<alias>sip:bob@broadsoft.com</alias>
<alias>sip:rhughes@broadsoft.com</alias>
</aliases>
<extensions>
<extension>5317</extension>
<extension>1321</extension>
</extensions>
</BroadSoftDocument>
The device forwards the 200 OK to the subscriber (without the XML body). The call flow is
shown below:
Figure 41-5: Interoperability with BroadWorks Registration Process
The device saves the users in its registration database with their phone numbers and
extensions, enabling future routing to these destinations during survivability mode when
communication with the BroadWorks server is lost. When in survivability mode, the device
routes the call to the Contact associated with the dialed phone number or extension
number in the registration database.

To enable the BroadWorks survivability feature:
1. Open the SBC General Settings page ( Setup menu > Signaling & Media tab > SBC
folder > SBC General Settings ).
2. From the 'BroadWorks Survivability Feature' drop-down list
(SBCExtensionsProvisioningMode), select
Enable :
3. Click Apply .