U 222.222.222.222:1024 -> 111.111.111.111:5060
INVITE sip:13237773456@111.111.111.111 SIP/2.0.
Via: SIP/2.0/UDP 10.0.1.100:5060;branch=z9hG4bK03cd6fd2;rport.
From: "3235551212" <sip:3235551212@111.111.111.111>;tag=as146a87d7.
To: <sip:13237773456@111.111.111.111>.
Contact: <sip:3235551212@222.222.222.222>.
Call-ID: 4382446d3a46269d7f469e93147b46eb@111.111.111.111
CSeq: 103 INVITE.
User-Agent: Asterisk PBX.
Max-Forwards: 70.
Remote-Party-ID: "3235551212" <sip: 
3235551212@111.111.111.111>;privacy=off;screen=no.
Proxy-Authorization: Digest username="3235551212",  
realm="111.111.111.111", algorithm=MD5, uri="sip:13237773456@111.111.111.111 
", nonce="c52ba984-f888-dd11-80f4-00188b37805b",  
response="01635afacb7eeebc6fc0888991c0411d", qop=auth,  
cnonce="4e065f27", nc=00000001.
Date: Mon, 22 Sep 2008 22:54:14 GMT.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY.
Supported: replaces.
Content-Type: application/sdp.
Content-Length: 234.