Diameter SIP Application AVPs - Page 8

9.8. SIP-AOR AVP

   The SIP-AOR AVP is a RADIUS attribute imported from the RADIUS
   Extension for Digest Authentication [RFC4590] namespace, allowing a
   smooth transition between RADIUS and Diameter applications supporting
   SIP.  The SIP-AOR AVP carries the URI of the intended user related to
   the SIP request (whose location in SIP may vary depending on the
   actual SIP request and whether the SIP server is acting on Diameter
   due to a SIP-originated or terminating requests).

   The Diameter client (SIP server) uses the value found in a SIP
   Request-URI or a header field value of the SIP request to construct
   the SIP-AOR AVP.  The selection of a Request-URI or a particular
   header field to create the value of the SIP-AOR AVP depends on the
   semantics of the SIP message and whether the SIP server is acting for
   originating or terminating requests.  For instance, when the SIP
   server receives an INVITE request addressed to the served user (e.g.,
   the SIP server is receiving a terminating SIP request), it maps the
   SIP Request-URI of the SIP request to this AVP.  However, when the
   SIP server receives an INVITE request originated by the served user,
   it can map either the P-Asserted-Identity or the From header field
   values to this AVP.  If the SIP server is acting as a SIP registrar,
   then it maps the To header field of the REGISTER request to the
   SIP-AOR AVP.

9.9. SIP-Visited-Network-Id AVP

   The SIP-Visited-Network-Id AVP (AVP Code 386) is of type UTF8String.
   This AVP contains an identifier that helps the home network identify
   the visited network (e.g., the visited network domain name), in order
   to authorize roaming to that visited network.

9.10. SIP-User-Authorization-Type AVP

   The SIP-User-Authorization-Type AVP (AVP Code 387) is of type
   Enumerated and indicates the type of user authorization being
   performed in a User Authorization operation, i.e., the Diameter
   User-Authorization-Request (UAR) command.  The following values are
   defined:

   o  REGISTRATION (0)
      This value is used for initial registration or re-registration.
      This is the default value.

   o  DEREGISTRATION (1)
      This value is used for deregistration.

   o  REGISTRATION_AND_CAPABILITIES (2)
      This value is used for initial registration or re-registration
      when the SIP server explicitly requests the Diameter server to get
      capability information.  This capability information helps the SIP
      server to allocate another SIP server to serve the user.

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