D-Link DIR-615 User Manual page 47

Enable STUN:
Enter the IP address of a STUN server.
STUN Server
Address:
Enter the port of the STUN server.
STUN Server Port:
Enter the username of the STUN server.
STUN Server User
Name:
Enter the password of the STUN server
STUN Server
Password:
Enter a port of the router that allow STUN server to get through.
Local Listen Port
D-Link DIR-615 User Manual 45