Headset voice has to squeeze over GSM voice channel, that is 9.6kbps. I had pretty smooth experience with using Pulse with multiple sinks/sources, maybe look i

Headset voice has to squeeze over GSM voice channel, that is 9.6kbps. I had pretty smooth experience with using Pulse with multiple sinks/sources, maybe look into doc. Only problem I had was latency sync while multiple sinks play together.