;tag=[call_number] To[$3] Call-ID: [call_id] Cseq: 1 INVITE Contact: sip:sipp@[local_ip]:[local_port] Max-Forwards: 70 Content-Type: application/sdp Content-Length: [len] v=0 o=- 2 2 IN IP4 192.168.0.15 s=pjmedia c=IN IP4 192.168.0.15 t=0 0 m=audio 0 RTP/AVP 0 ]]> ;tag=[call_number] To[$3] Call-ID: [call_id] Cseq: 1 INVITE Contact: sip:sipp@[local_ip]:[local_port] Max-Forwards: 70 Content-Length: 0 ]]>