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...YEXTENSION) And the debug output: Sip read: INVITE sip:94732771@yyy.yy.113.56;user=phone SIP/2.0 Via: SIP/2.0/UDP xxx.xxx.226.166:5060 From: "TOMS" <sip:TOMS@yyy.yy.113.56>;tag=0003e362fc0a001a407788de-1f443a6c To: <sip:94732771@yyy.yy.113.56;user=phone> Call-ID: 0003e362-fc0a0042-22647abb-4243e54a@xxx.xxx.226.166 CSeq: 101 INVITE User-Agent: CSCO/4 Contact: <sip:TOMS@xxx.xxx.226.166:5060> Expires: 180 Content-Type: application/sdp Content-Length: 250 Accept: application/sdp v=0 o=Cisco-SIPUA 20902 8155 IN IP4 xxx.xxx.226.166 s=SIP Call c=IN IP4 xxx.xxx.226.166 t=0 0...