Here is what I would like to accomplish. We have two seperate locations one in DC and one in PA. Our phone system(UC560) is located here in PA. I would like to use SPA504G's at our remote location(DC). Is this a posibility? Currently I do not have a VPN connection between the two offices and would like to stay away from this if at all possible.(It's tough allocating funds) Right now all I have really tried is changing the "key system IP address" on the SPA504G to the public IP of the UC560. Are there any ports that need forwarded to the UC560?
Any help would be appreciated.