QuadroM-E1/T1 Manual I: Installation Guide
Appendix: Configuring SIP NAT Traversal
QuadroM-E1/T1; (SW Version 5.2.x)
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Appendix: Configuring SIP NAT Traversal
The QuadroM-E1/T1 initiates and receives SIP calls from the network connected to the
WAN port). In order to receive SIP calls, the QuadroM-E1/T1 must be able to receive pack-
ets from the SIP server or any other device that is trying to make an incoming call. If the
QuadroM-E1/T1 is placed behind a router with NAT, like most basic routers on the market
today, the QuadroM-E1/T1 will not be able to receive calls. To resolve this issue, either
STUN must be enabled on the QuadroM-E1/T1 or SIP NAT traversal must be set up in the
router and in the QuadroM-E1/T1 to properly route the incoming calls.
NAT or Network Address Translation is a common feature used to expand the use of con-
nected PCs and other networked devices without having to use multiple global Internet pub-
lic IP address. Most ISP will assign one public IP address to each customer that is con-
nected to the Internet. The customer can use a router to provide NAT capability and create
a private network of PCs and other devices not visible to the Internet. This method offers
security and also eliminates the need to assign global Internet public IP addresses to each
device.
Please Note
: SIP NAT traversal only works with Internet connections that have static IP ad-
dresses. Verify from your provider this is the case for your Internet connection. Some ISPs
provide dynamic IP addresses that may change from time to time, and are not appropriate
for SIP NAT traversal.
Please Note
: If you have more than one router in series between the QuadroM-E1/T1 and
the Internet, the same port forwarding setup must be configured on each router.
SIP NAT Traversal Setup
•
Install the QuadroM-E1/T1 behind the router. If the QuadroM-E1/T1 is configured with
its factory default settings, it is already configured for DHCP and will obtain an IP ad-
dress automatically from the router. If the DHCP was changed, please
Run the System
Configuration Wizard
to place the QuadroM-E1/T1 in DHCP mode. Power up the
QuadroM-E1/T1.
•
Connect a PC or laptop to the QuadroM-E1/T1 LAN port and power it up.
•
Verify the QuadroM-E1/T1 can connect to the Internet by opening a browser window
and browsing to a familiar WEB site. If the QuadroM-E1/T1 can not reach the Internet,
verify the LAN/WAN LEDs and the cabling. Verify the QuadroM-E1/T1 is set up for
DHCP on the WAN and that the router has the DHCP server enabled for the devices
behind it.
•
Find the address of the router and log into the router. Refer to the router user manual
on how to open the router configuration.
•
Set up port forwarding on the router to forward the UDP ports according to the ports
specified for SIP (Mapped Port for SIP, default: 5060) and RTP/RTCP (Min mapped
RTP/RTCP port (default 6000 and Max mapped RTP/RTCP port (default 6099)) on the
QuadroM-E1/T1. The router should forward that UDP (USP/TCP for SIP) ports to the
IP address assigned to the QuadroM-E1/T1. You can see the IP address of the
QuadroM-E1/T1 in the System menu under Status. The IP address will be listed as the
WAN IP address. Your router may also indicate the IP address assigned to the
QuadroM-E1/T1.
•
Find out the public Internet address of the router. To do so, open a browser and go to
www.whatismyip.com
. The site will return your public Internet IP address. Record this
IP address.
Summary of Contents for QuadroM-E1
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