Diameter SIP Application Command Codes

All the Diameter implementations conforming to this specification
   MUST implement and support the list of Diameter commands listed in
   Table 1.

   +-------------------------------------+-------+------+--------------+
   | Command Name                        | Abbr. | Code | Reference    |
   +-------------------------------------+-------+------+--------------+
   | User-Authorization-Request          |  UAR  |  283 | Section 8.1  |
   | User-Authorization-Answer           |  UAA  |  283 | Section 8.2  |
   | Server-Assignment-Request           |  SAR  |  284 | Section 8.3  |
   | Server-Assignment-Answer            |  SAA  |  284 | Section 8.4  |
   | Location-Info-Request               |  LIR  |  285 | Section 8.5  |
   | Location-Info-Answer                |  LIA  |  285 | Section 8.6  |
   | Multimedia-Auth-Request             |  MAR  |  286 | Section 8.7  |
   | Multimedia-Auth-Answer              |  MAA  |  286 | Section 8.8  |
   | Registration-Termination-Request    |  RTR  |  287 | Section 8.9  |
   | Registration-Termination-Answer     |  RTA  |  287 | Section 8.10 |
   | Push-Profile-Request                |  PPR  |  288 | Section 8.11 |
   | Push-Profile-Answer                 |  PPA  |  288 | Section 8.12 |
   +-------------------------------------+-------+------+--------------+

                      Table 1: Defined command codes

Sections defining commands contain the Message Format for that
   particular command.  The Message Formats included in this document
   are defined as per Section 3.2 of RFC 3588 [RFC3588].

8.1. User-Authorization-Request (UAR) Command

   The User-Authorization-Request (UAR) is indicated by the Command-Code
   set to 283 and the Command Flags' 'R' bit set.  The Diameter client
   in a SIP server sends this command to the Diameter server to request
   authorization for the SIP User Agent to route a SIP REGISTER request.
   Because the SIP REGISTER request implicitly carries a permission to
   bind an AOR to a contact address, the Diameter client uses the
   Diameter UAR as a first authorization request towards the Diameter
   server to authorize the registration.  For instance, the Diameter
   server can verify that the AOR is a legitimate user of the realm.

   The Diameter client in the SIP server requests authorization for one
   of the possible values defined in the SIP-User-Authorization-Type AVP
   (Section 9.10).

   The user name used for authentication of the user is conveyed in a
   User-Name AVP (defined in the Diameter base protocol, RFC 3588
   [RFC3588]).  The location of the authentication user name in the SIP

   REGISTER request varies depending on the authentication mechanism.
   When the authentication mechanism is HTTP Digest as defined in RFC
   2617 [RFC2617], the authentication user name is found in the
   "username" directive of the SIP Authorization header field value.
   This Diameter SIP application only provides support for HTTP Digest
   authentication in SIP; other authentication mechanisms are not
   currently supported.

   The SIP or SIPS URI to be registered is conveyed in the SIP-AOR AVP
   (Section 9.8).  Typically this SIP or SIPS URI is found in the To
   header field value of the SIP REGISTER request that triggered the
   Diameter UAR message.

   The SIP-Visited-Network-Id AVP indicates the network that is
   providing SIP services (e.g., SIP proxy functionality or any other
   kind of services) to the SIP User Agent.

   The Message Format of the UAR command is as follows:

       <UAR> ::= < Diameter Header: 283, REQ, PXY >
                 < Session-Id >
                 { Auth-Application-Id }
                 { Auth-Session-State }
                 { Origin-Host }
                 { Origin-Realm }
                 { Destination-Realm }
                 { SIP-AOR }
                 [ Destination-Host ]
                 [ User-Name ]
                 [ SIP-Visited-Network-Id ]
                 [ SIP-User-Authorization-Type ]
               * [ Proxy-Info ]
               * [ Route-Record ]
               * [ AVP ]

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