;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 ]]> ;tag=[call_number] To[$3] Call-ID: [call_id] Cseq: 1 ACK Contact: sip:sipp@[local_ip]:[local_port] Max-Forwards: 70 Content-Length: 0 ]]>