How is the STUN server address configured?
• The STUN server address, either an FQDN or a direct numeric IP address, can be defined with provisioning. If not provisioned, the VoIP client will try to resolve the address with a DNS SRV query. The query is expanded from the SIP domain, that is, the hostname part of the user’s SIP URI as specified in RFC 2782 and draft-ietf-behave-rfc3489bis-04.