Greetings all. In the past with Asterisk systems when there has been a Main location and multiple branch locations in different cities, I have put phone servers with analog or digital phone line gateways at each location and then each server manages calls that go between branches. I'm doing a new install and replacing such a system. My question is if it is possible/advisable to have only 1 phone server with analog or digital phone line gateways at each branch to connect to the respective branch's local telephone company. Having 1 central server would solve some issues that the company wants to do, but I've never had a pstn gateway traverse across a WAN on different subnets before. Each branch is connected to the main branch by either a dedicated line (T1 grade or higher) or a site to site VPN. Because of the type of business, we still need to use local lines rather than simply VOIP providers. Thanks for your thoughts. L.