I have two sites linked by Linksys broadband modem with VPN function, recently I am adding a ip phone system to my office so i could call the other office without using the analog phone. I already bought 2 sets of ip phone cp-6941, what hardware or software do I need to get to get these two phone to talk to each other?
and I would want to save money as i can. both office wont have over 5 ip phones, so dont need lots of licence.
my modem is linksys AG300