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This page contains a simple example to demonstrate the manipulation of the ext= and phone-context= tags of the SIP URI for calls to and from Lync clients. The Sonus

Spacevars
0company
SBC 1000/2000 system will send calls to a Lync client with ext and phone-context configured properly, and when received, the Lync client will appropriately set the calling number based on the phone-context value:

...

  • All Called Number of 4-digit whose number does not begin with '2' and Calling Number of 4-digit beginning with '2' will be sent to the Lync client. Sonus
    Spacevars
    0company
    SBC 1000/2000 will set phone-context to fremont.example.com and ext to the Calling Number.

...

Note

Note: SIP message sent by the Sonus

Spacevars
0company
SBC 1000/2000 system should have the From and To headers as follows:

No Format
From: 5551234<sip:5551234;ext=1234;phone-context=example.com@192.168.1.10>
To: tel:2222<sip:2222;ext=2222;phone-context=example.com@192.168.1.20>