Last time, I described how to set up ejabberd real time IM server and migrate your office to XMPP chat. In this tutorial I will explain how to configure ejabberd video & voice calling.
I assume the ejabberd 20.03 configuration from that previous tutorial as a start. It turns out, if you try ejabberd video & voice calling within your local network, it just works. If your office is on the same LAN or Wi-Fi, everyone will be able to voice or video call each other. Follow the setup from my previous tutorial. To achieve the best result, everyone should use the same chat app (“client”) on their phones or computers.
But that’s not good enough. You want your office staff to communicate no matter the location. You could use an office VPN. But all devices connected to it should appear as if on the same local network. That’s a significant overhead, especially for smartphones.
Lucky for us, ProcessOne just released ejabberd 20.04. This new version has a built-in STUN/TURN server. It simplifies service discoverability between clients. This helps chat apps setup a direct link between each other no matter the network they are on. And makes ejabberd video & voice calling possible.
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First, we need to update our current ejabberd instance to version 20.04 or newer. Be sure to make a backup. Please read the upgrade procedure docs to check the migration notes. Once ready, proceed with the update:
wget https://www.process-one.net/downloads/downloads-action.php?file=/20.04/ejabberd_20.04-0_amd64.deb -O ejabberd_20.04.deb apt install ./ejabberd_20.04.deb /etc/init.d/ejabberd start
Configuring STUN/TURN for ejabberd video & voice calling
Now, we need to edit
ejabberd.yml configuration file to enable STUN/TURN discovery using
mod_stun_disco. Add the following somewhere at the bottom of the
modules: ... mod_stun_disco: credentials_lifetime: 12h services: - host: 0.0.0.0 port: 3478 type: stun transport: udp restricted: false - host: 0.0.0.0 port: 3478 type: turn transport: udp restricted: true - host: example.com port: 5349 type: stuns transport: tcp restricted: false - host: example.com port: 5349 type: turns transport: tcp restricted: true
0.0.0.0 with the IP address of your ejabberd server, and
example.com with your ejabberd domain. Also, make sure your server & firewall allows connections on ports 3478, 5349.
Finally, we have to actually listen for STUN/TURN traffic. We need to add new listeners in the
listen section at the top of that configuration file:
listen: ... - port: 3478 transport: udp module: ejabberd_stun use_turn: true turn_min_port: 49152 turn_max_port: 65535 ## The server's public IPv4 address: turn_ip: 0.0.0.0 - port: 5349 transport: tcp module: ejabberd_stun use_turn: true tls: true turn_min_port: 49152 turn_max_port: 65535 ip: 0.0.0.0 turn_ip: 0.0.0.0
0.0.0.0 with the IP address of your ejabberd server. Make sure that server & firewall allows connections in the range of ports from 49152 to 65535.
Configuring ejabberd STUN/TURN domain records (DNS)
There are a few extra steps to make it easier for clients to discover the STUN/TURN services. Create a list of SRV records under your main ejabberd domain:
_stun._udp IN SRV 0 0 3478 example.com. _stun._tcp IN SRV 0 0 3478 example.com. _stuns._tcp IN SRV 0 0 5349 example.com. _turn._udp IN SRV 0 0 3478 example.com. _turn._tcp IN SRV 0 0 3478 example.com. _turns._tcp IN SRV 0 0 5349 example.com.
Different domain providers have different names in the forms to set up such records. The above listings are usually split this way:
Testing ejabberd video & voice calling
In this tutorial I have tested ejabberd video & voice calling using two Android devices. Both were running Conversations. One device was on my local Wi-Fi while the other was on LTE. Both ejabberd video & voice calls were established quickly and the quality was between good and excellent.
Sometimes you may experience long delays while establishing calls. In that case try adjusting the
shaper settings in ejabberd configuration as follows:
shaper: normal: rate: 3000 burst_size: 20000 fast: 100000
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ejabberd server has a lot more to offer. We could experiment with BOSH or WebSocket connections that are useful for web applications. We could try and set up an MQTT broker. Let me know in the comments what kind of tutorials you want the most. For now, let’s tweak your ejabberd server to get 100% in the XMPP compliance test.
In this ejabberd tutorial series:
- How to move the office to ejabberd XMPP server
- How to set up ejabberd video & voice calling (STUN/TURN)
- How to configure ejabberd to get 100% in XMPP compliance test
- Check ejabberd XMPP server useful configuration steps
- Starting with MQTT protocol and ejabberd MQTT broker
- Getting started with WebSocket API in ejabberd
- Install and configure MariaDB with ejabberd
- Publish-Subscribe pattern and PubSub in ejabberd
Photo by Harry Cunningham on Unsplash