OPTIONS sip:user@example.com SIP/2.0
To: sip:user@example.com
From: sip:caller@example.org;tag=33242
Max-Forwards: 3
Via: SIP/2.0/UDP 192.0.2.1;branch=z9hG4bK
Accept: application/sdp
Call-ID: badbranch.sadonfo23i420jv0as0derf3j3n
CSeq: 8 OPTIONS
l: 0
