Both my work and my home networks use dynamic IP's assigned by the ISP. I use DD-WRT routers at both locations. Both locations also use dyndns names so I can find them from anywhere. 3CX test server is at work. I took a single Cisco SPA5108 phone home and configured it per the instructions on the 3CX pages. I only configured the phone, no changes to the router or anything. It worked great. I then tried adding a 2nd SPA5108 as a new extension at home. Then I seemed to have problems with both remote (home) phones. I couldn't call one phone from the other, for example (I wrote the message from the phone down but it is at home). The question is, am I supposed to be able to run multiple remote extensions without making any changes to the router? Provided one extension works at a time, should they both work? It is entirely possible I was having some other form of network problem, so I'm planning on trying this again tonight. Just thought I'd ask if I skipped a step or something before I spend too much time chasing my tail. Thanks in advance.