SIP/2.0 180 Ringing
t: <sip:vijay@atosc.org>;tag=e18a3bd5
f: <sip:amoizard@antisip.com>;tag=293a8
i: 1960129851@one.ip.com
CSeq: 1 INVITE
v: SIP/2.0/UDP one.ip.com:5060;received=two.ip.org
m: <sip:tcchiang@one.ip.com>
Server: 3Com ICD 1.0.1.4.0
l: 0