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9.11. SIP-Supported-User-Data-Type AVP

   The SIP-Supported-User-Data-Type AVP (AVP Code 388) is of type
   UTF8String and contains a string that identifies the type of
   supported user data (user profile, see SIP-User-Data AVP
   (Section 9.12)) supported in the node.  The AVP can be repeated, if
   the SIP server supports several user data types.  In case of
   repetition, the Diameter client should order the different instances
   of this AVP according to its preferences.

   When the Diameter client inserts this AVP in a SAR message, it allows
   the Diameter client to provide an indication to the Diameter server
   of the types of user data supported by the SIP server.  The Diameter
   server, upon inspection of these AVPs, will return a suitable
   SIP-User-Data AVP (Section 9.12) of the type indicated in the
   SIP-User-Data-Type AVP (Section 9.12.1).

9.12. SIP-User-Data AVP

   The SIP-User-Data AVP (AVP Code 389) is of type Grouped.  This AVP
   allows the Diameter server to transport user-specific data, such as a
   user profile, to the SIP server (in the Diameter client).  The
   Diameter server selects a type of user data that is understood by the
   SIP server in the Diameter client, and has been indicated in a
   SIP-Supported-User-Data-Type AVP.  In case the Diameter client
   indicated support for several types of user data, the Diameter server
   SHOULD choose the first type supported by the client.

   The SIP-User-Data grouped AVP contains a SIP-User-Data-Type AVP that
   indicates the type of user data included in the
   SIP-User-Data-Contents-AVP.

   The SIP-User-Data AVP is defined as follows (per the grouped-avp-def
   of RFC 3588 .

      SIP-User-Data ::= < AVP Header: 389 >
                        { SIP-User-Data-Type }
                        { SIP-User-Data-Contents }
                      * [ AVP ]

9.12.1. SIP-User-Data-Type AVP

   The SIP-User-Data AVP (AVP Code 390) is of type UTF8String and
   contains a string that identifies the type of user data included in
   the SIP-User-Data AVP (Section 9.12).

   This document does not specify a convention to characterize the type
   of user data contained in the SIP-User-Data AVP (Section 9.12).  It
   is believed that in most cases this feature will be used in
   environments controlled by a network administrator who can configure
   both the client and server to assign the same value type at the
   client and server.  It is also RECOMMENDED that organizations
   developing their own profile of SIP-User-Data AVP (Section 9.12)
   allocate a type based on their canonical DNS name.  For instance,
   organization "example.com" can define several types of SIP-User-Data
   and allocate the types "type1.dsa.example.com",
   "type2.dsa.example.com", and so on.  This convention will avoid a
   clash in the allocation of types of SIP-User-Data AVP (Section 9.12).

9.12.2. SIP-User-Data-Contents AVP

   The SIP-User-Data-Contents AVP (AVP Code 391) is of type OctetString.
   The Diameter peers do not need to understand the value of this AVP.

   The AVP contains the user profile data required for a SIP server to
   give service to the user.

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