QuadroE1/T1 Manual I: Installation Guide
Appendix: Configuring SIP NAT Traversal
QuadroE1/T1; (SW Version 3.2.x)
49
Appendix: Configuring SIP NAT Traversal
The QuadroE1/T1 initiates and receives SIP calls from the network connected to the WAN
port). In order to receive SIP calls, the QuadroE1/T1 must be able to receive packets from
the SIP server or any other device that is trying to make an incoming call. If the
QuadroE1/T1 is placed behind a router with NAT, like most basic routers on the market to-
day, the QuadroE1/T1 will not be able to receive calls. To resolve this issue, either STUN
must be enabled on the QuadroE1/T1 or SIP NAT traversal must be set up in the router and
in the QuadroE1/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 QuadroE1/T1 and the
Internet, the same port forwarding setup must be configured on each router.
SIP NAT Traversal Setup
•
Install the QuadroE1/T1 behind the router. If the QuadroE1/T1 is configured with its
factory default settings, it is already configured for DHCP and will obtain an IP address
automatically from the router. If the DHCP was changed, please
Run the System Con-
figuration Wizard
to place the QuadroE1/T1 in DHCP mode. Power up the
QuadroE1/T1.
•
Connect a PC or laptop to the QuadroE1/T1 LAN port and power it up.
•
Verify the QuadroE1/T1 can connect to the Internet by opening a browser window and
browsing to a familiar WEB site. If the QuadroE1/T1 can not reach the Internet, verify
the LAN/WAN LEDs and the cabling. Verify the QuadroE1/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
QuadroE1/T1. The router should forward that UDP (USP/TCP for SIP) ports to the IP
address assigned to the QuadroE1/T1. You can see the IP address of the
QuadroE1/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
QuadroE1/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.
•
From the QuadroE1/T1 Management menu go to the SIP Settings menu and check
Use Manual NAT Traversal for SIP. For NAT station IP, enter the public Internet IP
address found on the step above and the port numbers for SIP and RTP/RTCP. The
default values are:
•
For Mapped Port for SIP 5060
•
For Min mapped RTP/RTCP port 6000
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