SIP/2.0 100<hex>20</hex>
Via: SIP/2.0/UDP 192.0.2.105;branch=z9hG4bK2398ndaoe
Call-ID: noreason.asndj203insdf99223ndf
CSeq: 35 INVITE
From: <sip:user@example.com>;tag=39ansfi3
To: <sip:user@example.edu>;tag=902jndnke3
Content-Length: 0
Contact: <sip:user@host105.example.com>
