REGISTER sip:garage.sr.ntc.nokia.com SIP/2.0
Via: SIP/2.0/UDP srlab.sr.ntc.nokia.com:5060;maddr=192.168.102.5
Record-Route: <sip:garage.sr.ntc.nokia.com:5060;maddr=srlab.sr.ntc.nokia.com>
From: sip:digest@garage.sr.ntc.nokia.com
To: sip:digest@garage.sr.ntc.nokia.com
Call-Id: 982773899-reg@172.21.9.155
Cseq: 2 REGISTER
Contact: sip:digest@172.21.9.155
Expires: 180
Content-Length: 0
Accept-Language: en
Supported: sip-cc, sip-cc-01, timer
User-Agent: Pingtel/0.8.0 (WinNT)
Authorization: Digest USERNAME="digest",
  REALM="garage.sr.ntc.nokia.com", NONCE="MjAwMS0wMS0yMSAxNTowODo1OA==",
  RESPONSE="d9d7f1ae99a013cb05f319f0f678251d",
  URI="sip:garage.sr.ntc.nokia.com"
Via: SIP/2.0/UDP 172.21.9.155