;tag=[pid]SIPpTag00[call_number] To: sut ;tag=pasdetagicinormalement Call-ID: [call_id] CSeq: 1 SUBSCRIBE Contact: sip:sipp@[local_ip]:[local_port] Max-Forwards: 70 Event: presence Expires: 60 Accept: application/pidf+xml Allow-Events: presence User-Agent: full-presence-support Content-Length: 0 ]]> ;tag=[pid]SIPpTag00[call_number] To: sut ;tag=pasdetagicinormalement Call-ID: [call_id] CSeq: 2 SUBSCRIBE Contact: sip:sipp@[local_ip]:[local_port] Max-Forwards: 70 Event: presence [authentication] Expires: 60 Accept: application/pidf+xml Allow-Events: presence User-Agent: full-presence-support Content-Length: 0 ]]>