Setting-Up Servers Behind a Cisco VOIP Router
From Asterisk Australia
Q. How do I set-up a server behind a Linksys VOIP router?
Port Forwarding is a method that allows you to run a server behind the router. Port Forwarding opens a specific port to a computer behind the router, allowing all incoming traffic on that port to be sent directly to that server. It is used to set up servers behind the router.</p>
In setting-up Port Forwarding on the Linksys router, you will need to go through two steps:
- Assigning Static IP Address on the Server PC
- Setting-up Port Forwarding on the Router

Below is an example of how to set up Port Forwarding. In the example below, we will be setting-up an FTP Server. FTP uses ports 20 and 21.
Note: It is important that you know the service ports the server is using. If you do not know which port/s your server is using, consult the user guide or contact the developer.
It is strongly recommended that the server is wired to the router for a stable connection.
Most common ports:
Web Server: 80
FTP Server: 20 and 21
POP3: 110
SMTP: 25
Assigning Static IP Address on the Server PC
This is done to prevent the server from changing or obtaining a new IP address from the router. This article assumes that the LAN IP address of the router is 192.168.15.1.
After assigning a static IP address on the server PC, set-up port forwarding on the router. For instructions, follow the steps below.
Setting-up Port Forwarding on the Router
Step 1:
Access the router's web-based setup page. For instructions, click <a href="../../../../en/US/products/ps10024/products_qanda_item09186a0080a35691.shtml">here</a>.Step 2:
When the router's web-based setup page appears, click Applications