sip80 229 Bytes Edit Raw Blame History Permalink 1 2 3 4 5 6 7 8 9 OPTIONS sip:135.180.130.133 SIP/2.0 Via: SIP/2.0/UDP company.com:5604 From: sip:iuser@company.com To: sip:user@135.180.130.133 Call-ID: 1804928587@company.com CSeq: 1 OPTIONS Expires: 3600 Contact: sip:host.company.com