Proposal 1: Make DTMF support part of the IMS voice service over NB-IoT NTN.

Proposal 2: Design DTMF support under the following assumptions

The DTMF packet size is at most as large as the voice packet size

Delay requirement of DTMF is not as stringent as voice service

DTMF takes priority over voice

Proposal 3: SA4 designs the mechanisms needed to support voice and DTMF multiplexing for SPS and works with RAN1 and RAN2.