RFC4083 - Input 3rd-Generation Partnership Project (3GPP) Release 5 Requirements on the Session Initiation Protocol (SIP)

   This implies a need for a notification mechanism whereby the UA can
   be notified of the de-registration, or of a request for
   re-registration.

   We believe that this requirement is met by the SIP-specific event
   notification [12] and a registration event package [14].

4.3.5.3.  Network-initiated De-registration, Network Maintenance

   There might be cases in which the SIP serving proxy has to shutdown;
   e.g., due to maintenance operation.  Although this situation is not
   likely to happen in everyday situations, it is desirable to have a
   mechanism to inform the UA that his current registration is being
   cancelled.  The UA may initiate another registration process that
   will lead to the selection of a new SIP serving proxy.

4.3.5.4.  Network-initiated De-registration, Network/Traffic Determined

   The system must support a mechanism to avoid inconsistent information
   storage and to remove any redundant registration information.  This
   case will occur when a subscriber roams to a different network
   without a prior de-registration.  This case occurs in normal mobility
   procedures when the user roams from one access network to another, or
   when new service conditions are imposed on roamers.

4.3.5.5.  Network-initiated De-registration, Administrative

   For different reasons (e.g., subscription termination, stolen
   terminal, etc.) a home network administrative function may determine
   a need to clear a user's SIP registration.  It is desirable to have a
   mechanism whereby the SIP serving proxy can inform the UA that its
   registration is being cancelled.

   There must be a procedure for the SIP serving proxy to de-register
   users.  The de-registration information must be available at all the
   proxies that keep registration state and the UA.

   We believe that a procedure based on SIP-specific event notification
   [12] and a registration event package [14] will meet this

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