The Media Transport Settings section allows administrators to configure the STUN (Session Traversal Utilities for NAT) server used for SIP media communication.
STUN Server Address
Configure the STUN server that Asterisk/PJSIP can use to determine the public IP address and port mapping when the PBX is operating behind NAT.
STUN Server Address: Defines the STUN server hostname or IP address used for NAT traversal.
Port: Defines the STUN server port used for media discovery and connectivity.