7 Exceptional procedures or unsuccessful outcome

22.0943GPPFollow Me service descriptionRelease 17Stage 1TS

7.1 Registration

If the system cannot accept a registration request, the initiating subscriber shall receive a notification that Follow Me registration was not successful. Possible causes are:

– insufficient information;

– feature not provisioned to initiating subscriber;

– feature not provisioned to remote party (in case the remote party is a subscriber);

– conflicting situation with supplementary services (e.g. incoming call barring has been activated);

– remote party already registered to a different initiating subscriber;

– insufficient authorisation for initiating subscriber or remote party.

7.2 Erasure

If the network cannot accept a mobile initiating or remote subscriber’s request for erasure, cause will be returned to the subscriber, such as:

– insufficient information;

  • remote party not registered;
  • remote party registered to a different initiating subscriber;
  • insufficient authorisation for initiating subscriber or remote party;

– feature not provisioned to initiating subscriber;

– feature not provisioned to remote party (in case the remote party is a subscriber).

Interrogation

If the network cannot accept a mobile initiating or remote subscriber’s request for interrogation, cause will be returned to the subscriber, such as:

  • insufficient information;
  • insufficient authorisation for initiating subscriber or remote party;
  • feature not provisioned to initiating subscriber;

– feature not provisioned to remote party (in case the remote party is a subscriber).

7.4 Invocation

Within a PLMN or different PLMNs the number of tandem forwarding connections (including call forwarding, call deflection, Follow Me) should be limited. The maximum number of tandem forwarding connections should be limited to a value between 1 and 5. This is to prevent infinite looping.

If the limit of successive forwardings of a call has already been reached, an unsuccessful call set up indication is sent backwards.

If the call cannot be completed to the Follow Me destination, then the network will clear the forwarded part of the call and an unsuccessful call set up indication is sent backwards.