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The challenge is to provide secure connection to subscribers behind NAT (Network Address Translation) devices and
Firewalls. Overcoming this traversal problem will lead to widespread deployment of profitable voice over IP service to
any subscriber with a broadband connection. Therefore, this IP Phone implements NAT traversal function for solving the
Firewall and NAT traversal problems.
STUN
Simple Traversal of User Datagram Protocol through Network Address
Translators is a protocol that allows applications to determine the types
of NATs and firewalls are in between them and the internet. STUN also
provides the ability for applications to determine the public IP addresses
allocated to them by the NAT.
STUN Domain Name/IP Address
Enter STUN domain name or IP address if STUN is enabled.
6.14 NAT Traversal Settings Manual Config External IP/Port
User Defined External IP/Port
Enable or disable the settings for configuring the user defined external IP
address and port number.
External IP Address
Setup the external IP address manually.
Use Stun server to get external IP address.
Use UPnP to get external IP address.
External SIP Port
External
SIP
port
