# Example coturn configuration for BigBlueButton

# These are the two network ports used by the TURN server which the client
# may connect to. We enable the standard unencrypted port 3478 for STUN,
listening-port=3478

# and since TLS over SMTP port (465) is now blocked by major browser vendors, 
# we reverted to the most common coturn TLS port 5349, which has limitations
# in restrictive firewall environments. For maximum client support run 
# coturn on a dedicated host on port 443.
tls-listening-port=5349

# If the server has multiple IP addresses, you may wish to limit which
# addresses coturn is using. Do that by setting this option (it can be
# specified multiple times). The default is to listen on all addresses.
# You do not normally need to set this option.
#listening-ip=172.17.19.101

# If the server is behind NAT, you need to specify the external IP address.
# If there is only one external address, specify it like this:
#external-ip=172.17.19.120
# If you have multiple external addresses, you have to specify which
# internal address each corresponds to, like this. The first address is the
# external ip, and the second address is the corresponding internal IP.
#external-ip=172.17.19.131/10.0.0.11
#external-ip=172.17.18.132/10.0.0.12

# Fingerprints in TURN messages are required for WebRTC
fingerprint

# The long-term credential mechanism is required for WebRTC
lt-cred-mech

# Configure coturn to use the "TURN REST API" method for validating time-
# limited credentials. BigBlueButton will generate credentials in this
# format. Note that the static-auth-secret value specified here must match
# the configuration in BigBlueButton's turn-stun-servers.xml
# You can generate a new random value by running the command:
#   openssl rand -hex 16
use-auth-secret
# static-auth-secret=<random value>

# If the realm value is unspecified, it defaults to the TURN server hostname.
# You probably want to configure it to a domain name that you control to
# improve log output. There is no functional impact.
realm=example.com

# Configure TLS support.
# Adjust these paths to match the locations of your certificate files
cert=/tmp/cert.pem
pkey=/tmp/key.pem
# Limit the allowed ciphers to improve security
# Based on https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
cipher-list="ECDH+AESGCM:ECDH+CHACHA20:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS"

# Enable longer DH TLS key to improve security
dh2066

# All WebRTC-compatible web browsers support TLS 1.2 or later, so disable
# older protocols
no-tlsv1
no-tlsv1_1

# To enable single filename logs you need to enable the simple-log flag
syslog
#verbose

# Allocate Address Family according 
# If enabled then TURN server allocates address family according  the TURN 
# Client <=> Server communication address family.
# (By default Coturn works according RFC 6156.)
# !!Warning: Enabling this option breaks RFC6156 section-4.2 (violates use default IPv4)!!
keep-address-family