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Chapter 4: Configuring your VOIP
Multi-Tech Systems, Inc. 71
NAT Traversal
Setting the NAT Traversal parameters. NAT (Network Address Translation) parameters are applicable only when
the MultiVOIP is operating in SIP mode. STUN (Simple Traversal of UDP through NATs (Network Address
Translation)) is a protocol for assisting devices behind a NAT firewall or router with their packet routing. This is not
available on the –SS models.
Figure 4-23: NAT Traversal
Descriptions for NAT Traversal screen fields are presented in the table below.
NAT Traversal Definitions
Field Name
V
alues Description
Enable (STUN) Y/N Enables STUN client functionality in the MultiVOIP.
STUN (Simple Traversal of UDP through NATs (Network Address Translation))
is a protocol that allows a server to assist client gateways behind a NAT firewall
or router with their packet routing.
Name/IP (Server)
n.n.n.n
IP address of the STUN server.
Port (Server;
NAT/STUN)
port;
default=
3478
The data port (TDM time slot) at which STUN info will be transmitted and
received.
Keep Alive (Timers;
NAT/STUN)
60 – 3600
(seconds)
The interval at which the STUN client sends indicator (“Keep Alive”) packets to
the STUN server to determine whether or not the STUN server is available.