start of article on a/v support

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Title: Prosody server support for A/V calls with Conversations
Date: 2020-05-04
Tags: xmpp, chat, coturn, instant messaging, prosody, audio/video calls
Slug: server-support-for-audio-video-calls
Summary: Configure support for audio/video calls with Prosody,
Category: instant messaging
Status: draft
[TOC]
Introduction
---
This is a guide to set up server-side support for audio/video calls over XMPP. To do this we will install and configure `coturn`, a libre STUN/TURN server that helps establish peer connections across firewalls for media streams such as calls. Additionally we will configure `prosody` to talk to `coturn`.
Like the other guides, this one assumes Debian stable running on the server, the fact that you will end up hosting a few of your friends and that you have some basic skills working on a linux command line.
Furthermore it assumes you have already installed and configured Prosody, if you haven't have a look [at how to do so as well!]({filename}instant-messaging/configuring_an_xmpp_server_prosody_0.11.md)
Set up firewall
----
To make your server communicate make sure following ports are open in your firewall for UDP traffic:
:::console
3478 (TURN)
5349 (TURN + TLS)
49152-65535 (UDP endpoints for clients)
Set up coturn
---
First install `coturn`
:::console
sudo apt-get update && sudo apt-get install coturn