/etc/ufw/applications.d/turnserver is in coturn 4.5.0.7-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [Turnserver]
title=Coturn Turnserver
description=Free open source implementation of TURN and STUN Server
ports=3478,3479,5349,5350,49152:65535/tcp|3478,3479,5349,5350,49152:65535/udp
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