Have you looked at mumble?
this post was submitted on 08 Oct 2023
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That's voice chat, i.e. chat rooms and group conversations.
The "calling" feature is missing though. You can't get the attention of someone who isn't currently active on the server.
Ah fair enough
I’d recommend setting up a Matrix server with Element
E2E encrypted text & voice calls (I believe unless they’re still doing the rewrite of e2e voice calls)
Matrix info: https://matrix.org Synapse server install: https://matrix-org.github.io/synapse/latest/setup/installation.html Synapse TURN (voice) install: https://matrix-org.github.io/synapse/latest/turn-howto.html
Edit: calls also work on mobile (hooks into native mobile calling apis to look very similar to a normal phone call)
https://github.com/spantaleev/matrix-docker-ansible-deploy makes it easy to deploy.
Not sure about the RAM limitation. If Synapse is too heavy, perhaps a different server (Dendrite?) will be light enough.
https://snikket.org/ can do that well. Currently only 1:1 voice calls though, small group conference calls are still a work in progress.
This looks very interesting. Thanks.
SIP?
The 5 users will only talk to each other, or you have to connect out to the regular phone network? Group calls? Messaging? And when you say secure, do you mean end to end encrypted?
Yeah e2e encryption is a must. The 5 users will talk to each other only. And yes messaging will be good to have too.