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Written by Hemanshu Patel
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Thursday, 08 November 2007 |
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Page 2 of 17 2.1. Successful New Registration
Bob SIP Server
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| REGISTER F1 |
|------------------------------>|
| 401 Unauthorized F2 |
|<------------------------------|
| REGISTER F3 |
|------------------------------>|
| 200 OK F4 |
|<------------------------------|
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Bob sends a SIP REGISTER request to the SIP server. The request
includes the user's contact list. This flow shows the use of HTTP
Digest for authentication using TLS transport. TLS transport is used
due to the lack of integrity protection in HTTP Digest and the danger
of registration hijacking without it, as described in RFC 3261 [1].
The SIP server provides a challenge to Bob. Bob enters her/his valid
user ID and password. Bob's SIP client encrypts the user information
according to the challenge issued by the SIP server and sends the
response to the SIP server. The SIP server validates the user's
credentials. It registers the user in its contact database and
returns a response (200 OK) to Bob's SIP client. The response
includes the user's current contact list in Contact headers. The
format of the authentication shown is HTTP digest. It is assumed
that Bob has not previously registered with this Server.
Message Details
F1 REGISTER Bob -> SIP Server
REGISTER sips:ss2.biloxi.example.com SIP/2.0
Via: SIP/2.0/TLS client.biloxi.example.com:5061;branch=z9hG4bKnashds7
Max-Forwards: 70
From: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>;tag=a73kszlfl
To: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>
Call-ID:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 REGISTER
Contact: <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>
Content-Length: 0
F2 401 Unauthorized SIP Server -> Bob
SIP/2.0 401 Unauthorized
Via: SIP/2.0/TLS client.biloxi.example.com:5061;branch=z9hG4bKnashds7
;received=192.0.2.201
From: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>;tag=a73kszlfl
To: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>;tag=1410948204
Call-ID:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 1 REGISTER
WWW-Authenticate: Digest realm="atlanta.example.com", qop="auth",
nonce="ea9c8e88df84f1cec4341ae6cbe5a359",
opaque="", stale=FALSE, algorithm=MD5
Content-Length: 0
F3 REGISTER Bob -> SIP Server
REGISTER sips:ss2.biloxi.example.com SIP/2.0
Via: SIP/2.0/TLS client.biloxi.example.com:5061;branch=z9hG4bKnashd92
Max-Forwards: 70
From: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>;tag=ja743ks76zlflH
To: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>
Call-ID:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 2 REGISTER
Contact: <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>
Authorization: Digest username="bob", realm="atlanta.example.com"
nonce="ea9c8e88df84f1cec4341ae6cbe5a359", opaque="",
uri="sips:ss2.biloxi.example.com",
response="dfe56131d1958046689d83306477ecc"
Content-Length: 0
F4 200 OK SIP Server -> Bob
SIP/2.0 200 OK
Via: SIP/2.0/TLS client.biloxi.example.com:5061;branch=z9hG4bKnashd92
;received=192.0.2.201
From: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>;tag=ja743ks76zlflH
To: Bob <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>;tag=37GkEhwl6
Call-ID:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
CSeq: 2 REGISTER
Contact: <sips:
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
>;expires=3600
Content-Length: 0
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