Unsuccessful Registration 401

2.5.  Unsuccessful Registration


   Bob                        SIP Server
     |                               |
     |          REGISTER F1          |
     |------------------------------>|
     |      401 Unauthorized F2      |
     |<------------------------------|
     |          REGISTER F3          |
     |------------------------------>|
     |      401 Unauthorized F4      |
     |<------------------------------|
     |                               |

   Bob sends a SIP REGISTER request to the SIP Server.  The SIP server
   provides a challenge to Bob.  Bob enters her/his 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 attempts to validate the user's
   credentials, but they are not valid (the user's password does not
   match the password established for the user's account).  The server
   returns a response (401 Unauthorized) to Bob's SIP client.

   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
    ;received=192.0.2.201
   From: Bob <sips:bob@biloxi.example.com>;tag=a73kszlfl
   To: Bob <sips:bob@biloxi.example.com>
   Call-ID: 1j9FpLxk3uxtm8tn@biloxi.example.com
   CSeq: 1 REGISTER
   Contact: <sips:bob@client.biloxi.example.com>
   Content-Length: 0





Johnston, et al.         Best Current Practice                 [Page 10]

 
RFC 3665              SIP Basic Call Flow Examples         December 2003


   F2 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:bob@biloxi.example.com>;tag=a73kszlfl
   To: Bob <sips:bob@biloxi.example.com>;tag=1410948204
   Call-ID: 1j9FpLxk3uxtm8tn@biloxi.example.com
   CSeq: 1 REGISTER
   WWW-Authenticate: Digest realm="atlanta.example.com", qop="auth",
    nonce="f1cec4341ae6ca9c8e88df84be55a359",
    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:bob@biloxi.example.com>;tag=JueHGuidj28dfga
   To: Bob <sips:bob@biloxi.example.com>
   Call-ID: 1j9FpLxk3uxtm8tn@biloxi.example.com
   CSeq: 2 REGISTER
   Contact: <sips:bob@client.biloxi.example.com>
   Authorization: Digest username="bob", realm="atlanta.example.com",
    nonce="f1cec4341ae6ca9c8e88df84be55a359", opaque="",
    uri="sips:ss2.biloxi.example.com",
    response="61f8470ceb87d7ebf508220214ed438b"
   Content-Length: 0

   /*  The response above encodes the incorrect password */


   F4 401 Unauthorized SIP Server -> Bob

   SIP/2.0 401 Unauthorized
   Via: SIP/2.0/TLS client.biloxi.example.com:5061;branch=z9hG4bKnashd92
    ;received=192.0.2.201
   From: Bob <sips:bob@biloxi.example.com>;tag=JueHGuidj28dfga
   To: Bob <sips:bob@biloxi.example.com>;tag=1410948204
   Call-ID: 1j9FpLxk3uxtm8tn@biloxi.example.com
   CSeq: 2 REGISTER
   WWW-Authenticate: Digest realm="atlanta.example.com", qop="auth",
    nonce="84f1c1ae6cbe5ua9c8e88dfa3ecm3459",
    opaque="", stale=FALSE, algorithm=MD5
   Content-Length: 0