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6.6. Update of the User Profile

   The Diameter SIP application provides a mechanism for a Diameter
   server to asynchronously download a user profile to a SIP server
   whenever there is an update of such user profile.  It must be noted
   that the Diameter server also attaches the user profile to the
   Diameter Server-Assignment-Answer (SAA) message.  This is valid for
   most of the daily situations; however, the administrator may decide
   to update or modify the user profile for a particular user, due to,
   e.g., new services made available to the user.  This may involve
   mechanisms outside the scope of this specification, such as human

   intervention, in the Diameter server.  In this situation, the
   Diameter server is able to push the new user profile into the SIP
   server allocated to the user.

   The scenario is illustrated in Figure 6.  When the user profile
   changes, the Diameter server sends a Diameter Push-Profile-Request
   (PPR) message (step 1) to the Diameter client in the SIP server
   allocated to that user (SIP server 2 in the examples).  The Diameter
   PPR message contains one or more SIP-User-Data AVPs, a User-Name AVP
   and zero or more SIP-AOR AVPs.  The Diameter client in SIP server 2
   acknowledges the Diameter PPR message by sending a Diameter
   Push-Profile-Answer (PPA) message (step 2) to the Diameter server.

                   +--------+          +--------+
                   |Diameter|          |  SIP   |
                   | server |          |server 2|
                   +--------+          +--------+
                       |                   |
                       |     1. PPR        |
                       |------------------>|
                       |                   |
                       |     2. PPA        |
                       |<------------------|
                       |                   |

      Figure 6: Diameter server pushes an update of the user profile

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