3Com V7122 User Manual page 267

Via: SIP/2.0/UDP 10.1.1.200
From: <sip: 122@10.1.1.200>;tag=1c17940
To: <sip: 122@10.1.1.200>
Call-ID: 634293194@10.1.1.200
User-Agent: 3Com-Sip-Gateway/TrunkPack 1610/v.4.20.299.412
CSeq: 1 REGISTER
Contact: sip:122@10.1.1.200:
Expires:3600
On receiving this request the Registrar/Proxy returns 401 Unauthorized response.
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 10.2.1.200
From: <sip:122@10.2.2.222 >;tag=1c17940
To: <sip:122@10.2.2.222 >
Call-ID: 634293194@10.1.1.200
Cseq: 1 REGISTER
Date: Mon, 30 Jul 2001 15:33:54 GMT
Server: Columbia-SIP-Server/1.17
Content-Length: 0
WWW-Authenticate: Digest realm="3Com.com",
nonce="11432d6bce58ddf02e3b5e1c77c010d2",
stale=FALSE,
algorithm=MD5
According to the sub-header present in the WWW-Authenticate header the correct
REGISTER request is formed.
Since the algorithm used is MD5, take:
The username from the ini file: M2K-3Com
The realm return by the proxy: 3Com.com
The password from the ini file: 3Com.
The equation to be evaluated: (according to RFC this part is called A1).
'M2K-3Com:3Com.com:3Com'.
The MD5 algorithm is run on this equation and stored for future usage.
The result is: 'a8f17d4b41ab8dab6c95d3c14e34a9e1'
Next we need to evaluate the par called A2. We take:
The method type 'REGISTER'
Using SIP protocol 'sip'
Proxy IP from ini file '10.2.2.222'
The equation to be evaluated:
V7122 Gateway User Guide
267