SIP/2.0 0 
Via: SIP/2.0/UDP MY.IP.ADDRESS:5060;branch=z9hG4bK014de206
From: "CALLING.NUMBER" <sip:CALLING.NUMBER@MY.IP.ADDRESS>;tag=as08a6b037
To: <sip:CALLED.NUMBER@REMOTE.IP.ADDRESS>;tag=008C-0003-D615398C
Call-ID: 61fc18730991c7280bcd891852848a7e@MY.IP.ADDRESS
CSeq: 102 INVITE
Contact: <sip:CALLED.NUMBER@REMOTE.IP.ADDRESS:5060>
Reason: Q.850 ;cause=17
User-Agent: VEGA400/10.02.07.2xS019
Content-Length: 0