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9.2. SIP-Server-URI AVP

   The SIP-Server-URI AVP (AVP Code 371) is of type UTF8String.  This
   AVP contains a SIP or SIPS URI (as defined in RFC 3261 [RFC3261])
   that identifies a SIP server.

9.3. SIP-Server-Capabilities AVP

   The SIP-Server-Capabilities AVP (AVP Code 372) is of type Grouped.
   The Diameter indicates in this AVP the requirements for a particular
   SIP capability, so that the Diameter client (SIP server) is able to
   select another appropriate SIP server to serve the user.

   The SIP-Server-Capabilities AVP allows a Diameter client (SIP server)
   to select another SIP server for triggering or executing services to
   the user.  A user may have enabled some services that require the
   implementation of certain capabilities in the SIP server that
   triggers or executes those services.  For example, the SIP server
   that triggers or executes services to this user may need to implement
   SIP servlets [JSR-000116], Call Processing Language (CPL) [RFC3880],
   or any other kind of capability.  Or perhaps that user belongs to a
   premium users group that has a certain stringent quality-of-service
   agreement that requires a fast SIP server.  The capabilities required
   or recommended to a given user are conveyed in the
   SIP-Server-Capabilities AVP.  When it receives them, the Diameter
   client (SIP server) that does the SIP server selection needs to have
   the means to find out available SIP servers that meet the required or
   optional capabilities.  Such means are outside the scope of this
   specification.

   Note that the SIP-Server-Capabilities AVP assists the Diameter client
   (SIP server) to produce a subset of all the available SIP servers to
   be allocated to the user in the Home Realm; this is the subset that
   conforms the requirements of capabilities on a per-user basis.
   Typically this subset will be formed of more than a single SIP

   server, so once the subset of those SIP servers is identified, it is
   possible that several instances of these SIP servers exist, in which
   case the Diameter client (SIP server) should choose one particular
   SIP server to execute and trigger services to this user.  It is
   expected that at this point the SIP server (Diameter client) will
   follow the procedures of RFC 3263 [RFC3263] to allocate one SIP
   server to the user.

   The SIP-Server-Capabilities AVP is defined as follows (per the
   grouped-avp-def of RFC 3588 [RFC3588]):

      SIP-Server-Capabilities ::= < AVP Header: 372 >
                                * [ SIP-Mandatory-Capability ]
                                * [ SIP-Optional-Capability ]
                                * [ SIP-Server-URI ]
                                * [ AVP ]

9.3.1. SIP-Mandatory-Capability AVP

   The SIP-Mandatory-Capability AVP (AVP Code 373) is of type
   Unsigned32.  The value represents a certain capability (or set of
   capabilities) that have to be fulfilled by the SIP server allocated
   to the user.

   The semantics of the different values are not standardized, as it is
   a matter of the administrative network to allocate its own semantics
   within its own network.  Each value has to represent a single
   capability within the administrative network.

9.3.2. SIP-Optional-Capability AVP

   The SIP-Optional-Capability AVP (AVP Code 374) is of type Unsigned32.
   The value represents a certain capability (or set of capabilities)
   that, optionally, may be fulfilled by the SIP server allocated to the
   user.

   The semantics of the different values are not standardized, as it is
   a matter of the administrative network to allocate its own semantics
   within its own network.  Each value has to represent a single
   capability within the administrative network.

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