coturn

firewallを超える場合に、turnサーバーでドメインを指定する

$ sudo cp /usr/local/etc/turnserver.conf.default /usr/local/etc/turnserver.conf
$ sudo vi /usr/local/etc/turnserver.conf

# The default realm to be used for the users when no explicit 
# origin/realm relationship was found in the database, or if the TURN
# server is not using any database (just the commands-line settings
# and the userdb file). Must be used with long-term credentials 
# mechanism or with TURN REST API.
#
#realm=mycompany.org
...

# Uncomment if no UDP client listener is desired.
# By default UDP client listener is always started.
#
#no-udp

# Uncomment if no TCP client listener is desired.
# By default TCP client listener is always started.
#
#no-tcp

# Uncomment if no TLS client listener is desired.
# By default TLS client listener is always started.
#
#no-tls

# Uncomment if no DTLS client listener is desired.
# By default DTLS client listener is always started.
#
#no-dtls

ってことはSTUNは外部で調達して、TURNはインスタンスで立てるって理解でOK?