test20.txt

this is simple sip stack.

INVITE sip:user;par=[e-mail] SIP/2.0 
To: sip:[e-mail] 
From: sip:[e-mail];tag=33242 
Max-Forwards: 3 
Call-ID: 0ha0isndaksdj@10.1.1.1 
CSeq: 8 INVITE 
Via: SIP/2.0/UDP 135.180.130.133;branch=z9hG4bKkdjuw 
Content-Length: 0