User guide

Chapter 4 – Configuring Your MultiVOIP
MultiVOIP® Voice/Fax over IP Gateways 77
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.
The following table describes NAT Traversal fields.
NAT Traversal Definitions
Field Name
Values
Description
Enable (STUN)
Y/N
Enables STUN client functions 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 is 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.