INVITE sip:t.watson@ieee.org SIP/2.0
Via: SIP/2.0/UDP c.bell-tel.com
From: A. Bell <sip:a.g.bell@bell-tel.com>
To: T. Watson <sip:t.watson@ieee.org>
Call-ID: 31414@c.bell-tel.com
CSeq: 1 INVITE