STUN and local transport settings for ICE stream transport.
Specify the STUN 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 STUN 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, STUN mapped address resolution will not be performed. In this case only ICE host candidates will be added to the ICE transport, unless if no_host_cands field is set. In this case, both host and srflx candidates are disabled.
If there are more than one STUN candidates per ICE stream transport component, the standard recommends to use the same STUN server for all STUN candidates.
The default value is empty.