14 Subscriber interactions with the CSE

22.0783GPPCustomised Applications for Mobile network Enhanced Logic (CAMEL)Release 17Service descriptionStage 1TS

14.1 Announcement and tones insertion

As a part of the following procedures, it shall be possible for the CSE to order the playing of announcements or tones to the calling subscriber:

– The call set-up request procedure;

– The unsuccessful call establishment procedure;

– The call disconnection procedure;

– The incoming call request procedure;

– The called party alert reporting procedure.

In the active phase of the call leg and in the mid-call procedure it shall be possible for the CSE to play tones and/or announcements to any held party or the group as specified in clauses 5, 6, 8 and 24. It shall be possible to play tones efficiently using local tone generators.

The HPLMN operator is responsible for the administration of announcements. If there is an appropriate bilateral agreement the VPLMN operator may also administer announcements.

14.2 Voice prompting and information collection

As a part of the call set-up request procedure, unsuccessful call establishment procedure, call disconnection procedure and incoming call request procedure it shall be possible for the CSE to order voice prompting and information collection to the calling subscriber. It shall not be possible to collect information from the user as part of the originating CAMEL handling for a forwarded call.

In the active phase of the call leg and in the mid-call procedure it shall be possible for the CSE to order voice prompting and information collection towards any held party as specified in clauses 5, 6, 8 and 24.

14.3 Subscriber interaction by using USSD

It shall be possible for the CSE to initiate the sending of a USSD message to the served subscriber at any time. It shall be possible for the CSE to receive a served subscriber initiated USSD message at any time (see TS 22.030 [3] and TS 22.090 [4]).