IMS Response Codes

IMS Response Codes :

The Response code are categorized in below types :-

1xx: Provisional    :request received, continuing to process the request

2xx: Success       : The Request successful.

3xx: Redirection   : Further action needs to be taken in order to complete the request.

4xx: Client Error  : The request contains bad syntax or cannot be fulfilled at this server

5xx: Server Error  : The server failed to fulfill an apparently valid request.

6xx: Global Failure:the request cannot be fulfilled at any server.

IMP codes and uses :

100 Trying :- Request is received  by the server this will stop the re-transmission of the

              request messages.

180 Ringing :- alter the user and local ring back.

183 Session Progress:-Share the progress of the session can be used to convey some session                                  information     

200 OK :- session success.

400 Bad Request :-Malformed request i.e. missing some value checked at the server.

401 Unauthorized:- The request requires user authentication.

407 Proxy Authentication Required :- authentication with the proxy failed.

THE INVITE MESSGAE:

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