How to enable audio/video calls on a self-hosted Delta Chat server?

k2evil · April 6, 2026, 12:34am

Hello,
I’m running a self-hosted Stalwart mail server and using Delta Chat in a private setup. Messaging works, but I can’t get audio/video calls to work.

SMTP and IMAP are working, and users are onboarded via QR (dclogin://).

The issue is that there’s no place in Delta Chat to configure anything related to calling, and I couldn’t find clear documentation on how this is supposed to work in a self-hosted setup. I’ve tried searching and asking AI tools, but they keep hallucinating or giving conflicting answers, so I’m looking for a reliable explanation.

What is the recommended way to enable calls in a self-hosted environment?

Any guidance or documentation would be appreciated.

Thanks!

garrimiller7 · April 6, 2026, 5:32am

You need a chatmail-turn server for calls. GitHub - chatmail/chatmail-turn: TURN server for chatmail relays · GitHub

WofWca · April 6, 2026, 8:16am

This post is basically the same as Can I add calls to my mail by adding a turn on HestiaCP?.

k2evil · April 6, 2026, 12:11pm

Thank you very much. This seems exactly what I’m looking.

Sorry for my duplicated question. I were looking for this for weeks.

Also any update on this?

Delta Chat is gonna include a default TURN server for non-Chatmail accounts, so most people don’t need to worry about this.

I’m asking since I believe Stalwart does NOT natively expose this key.

WofWca · April 6, 2026, 12:34pm

Yes, it is the case now, see this function:

github.com/chatmail/core

src/calls.rs

1219cbe1a


      
          /// Creates JSON with ICE servers when no TURN servers are known.
          pub(crate) fn create_fallback_ice_servers() -> Vec<UnresolvedIceServer> {
              // Do not use public STUN server from https://stunprotocol.org/.
              // It changes the hostname every year
              // (e.g. stunserver2025.stunprotocol.org
              // which was previously stunserver2024.stunprotocol.org)
              // because of bandwidth costs:
              // <https://github.com/jselbie/stunserver/issues/50>
          
              vec![
                  UnresolvedIceServer::Stun {
                      hostname: "nine.testrun.org".to_string(),
                      port: STUN_PORT,
                  },
                  UnresolvedIceServer::Turn {
                      hostname: "turn.delta.chat".to_string(),
                      port: STUN_PORT,
                      username: "public".to_string(),