SlackBuildsOrg/network/coturn

coturn (Free open source implementation of TURN and STUN Server)

The TURN Server is a VoIP media traffic NAT traversal server
and gateway. It can be used as a general-purpose network
traffic TURN server and gateway, too.

You need the 'turnserver' group and user to run this script,
for example:

  groupadd -g 366 turnserver
  useradd -u 366 -g turnserver -d /var/lib/turn -s /bin/bash turnserver

If you wish another group and username, you can set TURN_GROUP and
TURN_USER, for example:

  TURN_GROUP=mygroup TURN_USER=myuser ./coturn.SlackBuild