expected_error:0 a very simple message
SIP/2.0 200 OK
To: <sip:fluffy@example.org>;tag=fb86ad2694115d75c77dce61523c9f07.ca6e
From: <sip:fluffy@example.org>;tag=a1fd
Via: SIP/2.0/UDP cj14:5002;branch=z9hG4bK-c87542-472987176-1;received=1.2.3.4
Call-ID: 048cec32
CSeq: 2 REGISTER
Contact: <sip:fluffy@1.2.3.4:5002>;q=1.00;expires=1951
Contact: <sip:fluffy@example.com:5002>;q=0.50;expires=10
Contact: <sip:floppy@example.com:5002>;q=0.00;expires=100
Server: The Server
Content-Length: 0
Warning: junk junk junk