TURN transport settings for ICE stream transport.
Specify the TURN server domain or hostname or IP address. If DNS SRV resolution is required, application must fill in this setting with the domain name of the TURN server and set the resolver instance in the resolver field. Otherwise if the resolver setting is not set, this field will be resolved with hostname resolution and in this case the port field must be set.
The port field should also be set even when DNS SRV resolution is used, in case the DNS SRV resolution fails.
When this field is empty, relay candidate will not be created.
The default value is empty.