<--- SIP read from UDP:172.24.3.254:51108 --->
REGISTER sip:172.17.1.42 SIP/2.0^M
Via: SIP/2.0/UDP 172.24.3.254:5060;branch=z9hG4bK64aa7491^M
From: <sip:5001@172.17.1.42>;tag=001c585784db00186ee8f8f9-49c00103^M
To: <sip:5001@172.17.1.42>^M
Call-ID: 001c5857-84db0002-3799b38a-0162c5dd@172.24.3.254^M
Max-Forwards: 70^M
CSeq: 123 REGISTER^M
User-Agent: Cisco-CP7960G/8.0^M
Contact: <sip:5001@172.24.3.254:5060;transport=udp>;+sip.instance="<urn:uuid:00000000-0000-0000-0000-001c585784db>";+u.sip!model.ccm.cisco.com="7"^M
Content-Length: 0^M
Expires: 3600^M
^M