We tried to use this script.
But it only sets you into 1 voice channel. So my questions is:
Is it possible to have more than 1 voice channel active at once? Right now when you call somone, aint nobody around you can hear you and you can’t hear them. Don’t know if this even possible for fiveM. Can you speak in a phone with somebody while they can hear you also? 
Ask directly on that thread…no reason to create your own.
It was a generel fivem question, if you even read the thread 
I asked if it was possible to have 2 active voice channel at a time.
Have you tried to create more then one channel? 
Nope, beacuse i dont really know how to do that. Thats what the question is all about. I dont know if it’s possible to talk to one person on phone, and then one right beside you 
No it is not. As of right now you can only have one active voice channel
we tried it for weeks, we came to the conclusion that it is not possible with native functions. we wait for mumble support…
We found a solutuion to use a google turn server and it works fine
May i ask you to elaborate please ? or give me an ideea? i really want to implement calls and radio.