REGISTER sip:iptel.org:5060 SIP/2.0
To:poo <bear@iptel.org>
From: <sip:jiri@iptel.org>
Call-ID: 7138115741688223740@195.37.78.226
CSeq: 4 REGISTER
Via: SIP/2.0/UDP bat.iptel.org:5060
User-Agent:  UbiquityUserAgent/4
Expires: 0
Content-Length: 0