7 Interaction with other GSM services

3GPP42.068Release 17Stage 1TSVoice Group Call Service (VGCS)

7.1 Calling Line Identification Presentation (CLIP)

If CLIP is applied, the group call reference – including the group call area ID and the group ID – shall be presented to the destination dispatchers. In addition the subaddress field of the calling party may be used to identify the calling service subscriber or calling dispatcher to the destination dispatchers.

The receiving mobile stations of the destination service subscribers shall display the paged group ID regardless the destination service subscribers have a subscription to CLIP.

7.2 Calling Line Identification Restriction (CLIR)

CLIR shall be supported.

The network shall have the possibility to override CLIR or reject the request to establish a voice group call for a calling service subscriber or calling dispatcher who has CLIR activated.

7.3 Connected Line Identification Presentation (COLP)

If COLP is applied, the group call reference – including the group call area ID and the group ID – shall be presented to the calling dispatcher. No destination subscriber identities will be presented.

Calling service subscribers receive the group call reference via standard group call setup messaging. COLP therefore does not apply to service subscribers.

7.4 Connected Line Identification Restriction (COLR)

COLR is not applicable to voice group calls.

7.5 Call Forwarding Unconditional (CFU)

CFU is not applicable to voice group calls of service subscribers when activate and operative, i.e. CFU shall be ignored.

CFU is applicable for dispatchers, i.e. voice group calls are forwarded by CFU.

7.6 Call Forwarding on mobile subscriber Busy (CFB)

CFB is not applicable to voice group calls of service subscribers with CFB active and operative.

CFB is applicable for dispatchers if the voice group call does not have a higher priority than the present call.

7.7 Call Forwarding on No Reply (CFNRy)

CFNRy is not applicable to voice group calls of service subscribers with CFNRy active and operative.

CFNRy is applicable for dispatchers, i.e. voice group calls are forwarded by CFNRy.

7.8 Call Forwarding on mobile subscriber Not Reachable (CFNRc)

CFNRc is not applicable to voice group calls of service subscribers with CFNRc active and operative.

CFNRc is applicable for dispatchers, i.e. voice group calls are forwarded by CFNRc.

7.9 Call Waiting (CW)

CW is not applicable for service subscribers. Instead, as a network option, a notification of paging for other calls shall be given to the service subscribers involved in the voice group call.

CW is applicable for dispatchers. Subject to the capabilities of the UE and the serving network it shall be possible for a dispatcher to receive additional information of the talker when accepting a waiting voice group call.

Subject to the capabilities of the UE and the serving network it shall be possible for a dispatcher to receive an emergency indication for a waiting voice group call.

7.10 Call Hold (HOLD)

Call hold is not applicable for service subscribers. For handling of parallel group calls to the same destination subscriber see item i) of clause 4.

The acceptance of a voice group call by a service subscriber while being in a point-to-point call shall release the point-to-point call. This release will be invoked by the mobile station.

If a voice group call is requested by a service subscriber while being in a point-to-point call, the point-to-point call shall be released. This release will be invoked by the mobile station.

Call hold is applicable for dispatchers. Subject to the capabilities of the UE and the serving network it shall be possible for a dispatcher to receive additional information of the talker when retrieving a held voice group call.

Subject to the capabilities of the UE and the serving network it shall be possible for a dispatcher to receive an emergency indication and an indication that the emergency situation has ended for a held voice group call.

7.11 Multi-party Service (MPTY)

MPTY is not applicable for service subscribers.

MPTY is applicable for dispatchers, subject to the capabilities of the UE and the serving network.

7.12 Closed User Group (CUG)

CUG is not applicable for service subscribers. Consequently, being a member of a CUG has no impact on receiving and establishing voice group calls.

CUG is applicable for dispatchers. Therefore a dispatcher who is a member of a CUG may be excluded from originating, joining and receiving group calls subject to the capabilities of the UE and the serving network.

7.13 Advice of Charge (AoC)

AoC is not applicable.

7.14 Barring of All Outgoing Calls (BAOC)

BAOC is applicable, if subscribed to, with the possible exception of high priority voice group calls.

7.15 Barring of Outgoing International Calls (BOIC)

BOIC is not applicable for voice group calls of service subscribers.

BOIC is applicable for dispatchers.

7.16 Barring of Outgoing International Calls except those to the Home PLMN country (BOIC-exHC)

BOIC-exHC is not applicable for voice group calls of service subscribers.

BOIC-exHC is applicable for dispatchers.

7.17 Barring of All Incoming Calls (BAIC)

BAIC is not applicable for voice group calls to service subscribers.

BAIC is applicable for dispatchers.

7.18 Barring of Incoming Calls when Roaming outside the home PLMN country (BIC-Roam)

BIC-Roam is not applicable for voice group calls to service subscribers.

BIC-Roam is applicable for dispatchers.

7.19 Explicit Call Transfer (ECT)

ECT is not applicable for service subscribers.

ECT is applicable for dispatchers, subject to the capabilities of the UE and the serving network.

Note: Dispatcher rights may not be transferred.

7.20 Enhanced Multi-Level Precedence and Pre-emption service (eMLPP)

Different priorities with corresponding set-up procedures are applicable as defined in the stage 1 description of eMLPP in 3G TS 22.067.

7.21 Short Message Service (SMS)

Subject to capabilities of the UE and the serving network, it shall be possible for the talking service subscriber, the listening service subscriber or dispatcher in a voice group call as well as for other initiators of short messages that are not part of the voice group call to send short messages to the group call – addressed by the group call reference – for which delivery will be attempted only one time i.e. there is no re-try mechanism for short messages to group calls.

It shall be possible for the VGCS service provider to configure the short message service to a particular group in such a way that short messages to established group calls are either supported or not supported. If supported then the message shall be delivered immediately to the established group call.

A receipt confirmation, containing the group call reference of the voice group call, may be returned to the sender of the short message. However no receipt confirmation shall be returned by individual members of the voice group call.

Optionally the VGCS may trigger an SMS being sent back to the sender, containing information as to whether or not the group call was established at time of sending.

Subject to capabilities of the UE, service subscribers who have activated the group ID and are currently in the established group call shall be able to receive the content of short messages sent to the group call.

Subject to capabilities of the UE and the serving network, dispatchers who are connected to the group call, shall be able to receive the content of short messages sent to the group call.

The terminal shall treat the received content in the same way as if it would have been received by the normal SMS mechanism.

During an ongoing group call it shall be possible for the talker as well as the listener to send and receive point to point short messages.

Support of Short Message Service is optional in VGCS.

7.22 Operator Determined Barring (ODB)

Same as for subscriber controlled barring.

7.23 Completion of Calls to Busy Subscribers (CCBS)

The CCBS supplementary service is only applicable for dispatchers and not for VGCS service subscribers.

If a new terminating p-t-p call is set up to a dispatcher who is busy because of an active VGCS call, it shall be possible to allow the calling party to apply the CCBS service. If the dispatcher initiates a VGCS call and the called group ID has been active, then the dispatcher shall be connected to the ongoing VGCS call.

7.24 GPRS

Depending on the capabilities of the UE it shall be possible for the mobile dispatcher, the talking service subscriber as well as for the listening service subscriber to use GPRS in parallel to the VGCS subject to the capabilities of the serving network.