The CNAP supplementary service shall be withdrawn at the customer's request or for administrative reasons.
The CNAP supplementary service is activated as a result of provision.
The CNAP supplementary service is deactivated as a result of withdrawal.
The network shall automatically invoke the CNAP supplementary service in the call set-up phase to the terminating CNAP subscriber.
CNAP is invoked when the Calling Name Information associated with an incoming call is available and can be presented to the called party which has subscribed to CNAP.
A user who has subscribed to the CNAP supplementary service and receives a call shall also receive the calling name information of the calling party, if available.
The calling party takes no action to activate, initiate, or in any manner provide the calling name identity.
When the CNAP service is subscribed and activated, the destination network provides the called subscriber with calling name information at call set-up on all incoming calls or during an active call for that particular call.
In addition to, or instead of, the calling name identity, the subscriber may be given a presentation indicator with the relevant information.
The mobile subscriber can, by the appropriate control procedure, request from the network the status of this supplementary service. Upon receiving an interrogation request, the network shall send the status of this supplementary service to the subscriber.
The information sent to the subscriber shall indicate whether the service is provided to her.
The information sent in response to the interrogation of this supplementary service shall not imply the status of any other supplementary service.