Does anyone have experience with the cost dynamics of one vs the other? I imagine it has to be cheaper to run our own TURN servers, but I want to make sure it's worth it (cost savings significantly outweigh the setup overhead and such, in the long-term) before locking into that approach.

Context: implementing P2P VoIP in a mobile app, probably over WebRTC. We probably won't expect too much load at first (max 100 active concurrent calls), so I imagine Twilio might even be cheaper overall, at first.

Any help/resources/etc would be much appreciated. Thanks!