J. purpose: SIP server code @ 1.1 Registersip domain name or IP address port SIP/2.0
Via: SIP/2.0/UDP source domain name or IP address port
From: & lt; Sip, sip equipment coding @ the source domain name & gt;; The tag=185326220
To: & lt; Sip, sip equipment coding @ the source domain name & gt;
Call - ID: [email protected]
CSeq: 1 register
Contact: & lt; Sip, sip device coding @ source IP address port & gt;
Max - recently: 70
Expires: 3600
The Content - Length: 0

J. SIP/2.0401 1.2 Unauthorized
To: sip, sip device coding @ the source domain name
The Content - Length: 0
CSeq: 1 register
Call - ID: [email protected]
From: & lt; Sip, sip equipment coding @ the source domain name & gt;; The tag=185326220
Via: SIP/2.0/UDP source domain name or IP address port
WWW - Authenticate: Digestrealm="64010000", the nonce="6 fe9ba44a76be22a
"