SIP/2.0 180 Ringing
From: "jiri" <sip:jiri@iptel.org>;tag=ae2c8aec-fd00-4f0c-98b9-6d40b72c950c
To: <sip:jirim@bat.iptel.org>
Call-ID: 83cd6524-386b-4e78-8975-ab96a0f78590@212.202.173.36
CSeq: 2 OPTIONS
Content-Length: 0
Via: SIP/2.0/UDP 195.37.77.100;branch=902932441872fa3682b9de564b113050.e1.0
Via: SIP/2.0/UDP pig.iptel.org
foo: bar