Hello EE. I was hoping to get some advice on configuring my Cisco 1841 router. Here is the situation. We have a site that moved. They split between three different locations. They want to link the phones together to use the phone system at the main location. The phone provider wants to add a router at the main site to link up the phones. I have one spare Fastethernet port on the 1841 router at the main site. The serial interface is connecting to the Internet and one of the Fastethernet ports connect to the inside network. How to configure the spare port to talk to their router and route traffic? I attached a map and the IP info for the site and the existing router config. Thanks.