CANCEL sip:5105@192.168.36.180:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.36.80:5060;branch=4
From: <sip:5225@192.168.36.80:5060>
To: <sip:5105@192.168.6.5:5060>
Call-ID: c2943000-1ce062-44b1d2-2e323931@192.168.6.20
CSeq: 100 CANCEL
Content-Length: 0
