;tag=[pid]SIPpTag00[call_number] To: sut Call-ID: [call_id] CSeq: 1 INVITE Contact: sip:test@[local_ip]:[local_port] Max-Forwards: 70 Subject: Codec test Content-Type: application/sdp Content-Length: 0 ]]> ;tag=[pid]SIPpTag00[call_number] To: sut [peer_tag_param] Call-ID: [call_id] CSeq: 1 ACK Contact: sip:alice-codec-match@[local_ip]:[local_port] Max-Forwards: 70 Subject: Performance Test Content-Length: [len] v=0 o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip] s=- c=IN IP[media_ip_type] [media_ip] t=0 0 m=audio 0 RTP/AVP 9 0 8 101 ]]> Content-Length: 0 ]]>