6 Interaction with telecommunication services

23.1353GPPMulticall supplementary serviceRelease 17Stage 2TS

6.1 Speech

The Multicall supplementary service does not provide multiple traffic channels for speech calls. Refer to Procedure Check_OG_Multicall_MSC and Procedure Check_MT_Multicall_MSC.

If N_br_UE is greater than N_br_SN, the mobile station may initiate an Emergency call even if N_br_SN has been reached. When the network receives an Emergency call Setup message from the mobile station:

– if N_br_SN has not been reached, the network shall accept it regardless of N_br_SB or N_br_User;

– if N_br_SN has been reached, the network shall reject the emergency call setup attempt. The MS shall release one or more existing calls and it shall re-initiate an Emergency call.

The MS shall ensure that an emergency call Setup request is acceptable to a serving network which does not support multicall, if necessary by releasing one or more existing calls.

6.2 Short message service

No impact.

6.3 Facsimile service

The Multicall supplementary service provides multiple traffic channels for facsimile service except for alternate speech and facsimile group 3.

6.4 Data circuit asynchronous

The Multicall supplementary service provides multiple traffic channels for data circuit asynchronous.

6.5 Data circuit synchronous

The Multicall supplementary service provides multiple traffic channels for data circuit synchronous.

6.6 Void

6.7 GPRS

No impact.