REGISTER sip:192.168.102.23 SIP/2.0
Via: SIP/2.0/UDP 192.168.102.250:51781;rport;branch=z9hG4bKPj3f42ea713eca49ec93f6cb69f6c38014
Max-Forwards: 70
From: <sip:233@192.168.102.23>;tag=ca565d7bd4e24a6d80c631d395ee117e
To: <sip:233@192.168.102.23>
Call-ID: a5e53e302b2d4a4d83c1455527c882c3
CSeq: 26538 REGISTER
User-Agent: MicroSIP/3.21.5
Contact: <sip:233@192.168.102.250:51781;ob>
Expires: 300
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Content-Length:  0