After (finally) getting Cisco IP phones to work on 3CX I'm now tackling the job of connecting a Linksys SPA3102. I tried doing so using the instructions on the 3CX site unsuccessfully. First, I want to use the SPA3102 to connect a PSTN line to 3CX so I can make and receive calls on that line from my 3CX extensions and I also want to use the single analog phone port on the SPA3102 to connect an analog cordless phone as a 3CX extension. I think the SPA3102 can do both. I am not wanting to use the Linksys as a router or a DHCP server nor am I looking to use the function that lets me dial in to the Linksys from a remote location to make cheap VoIP calls. My confusion is related to the IP addresses I need to use in the setup. the IP address of my ADSL2 modems/router/DHCP server is 10.1.1.1. My 3CX system is installed on a laptop at IP address 10.1.1.30 and I currently have the Linksys at 10.1.1.31 and have disabled DHCP on that box. I think I'm okay with the LAN settings but I'm not sure what IP address to use in the WAN settings or whether to use dynamic or static addressing. The documentation on the 3CX site at http: //www.3cx.com/voip-gateways/linksys-3102/ - NO LONGER AVAILABLE says (in part): "6. One thing to have in mind is that if you are planning to use this device just as a VoIP gateway, then you don’t need to configure the Ethernet(local or yellow) interface; just the Internet (external or blue) interface. 7. Now click the “ROUTER” and after that the “WAN SETUP” tab on the top of the page to configure an IP in your local network. (Assuming you already have a router/internet gateway and you just want to use this device as a VoIP Gateway)." I don't think I am using this device "just as VoIP gateway" am I? I don't think I'm using it as a VoIP gateway at all, am I? Isn't my (VoIP enabled) ADSL2 modem/router doing that in conjunction with 3CX? This even confuses me about the physical cable connections I have made to the Linksys - I have connected a cable to the Ethernet (yellow) socket but nothing to the Internet (blue) socket. The other end of the Ethernet cable is connected to one of my local ethernet switches - I am able to access the configurations panels on the Linksys from one of the computers on my network. Point 7 above really confuses me. I already have a router/Internet gateway so I think I need to "configure an IP in my local network". But what IP? The IP of the router? Of the Linksys box? Of the 3CX system? Or something else? I have looked at sample configurations of the Linksys box provided on this forum by Michael Knowles (http://www.3cx.com/forums/spa-3102---uk-settings-4655-30.html#p22450) - in his post he says his "10.0.0.14 is the Linksys in question, 10.0.0.2 is my 3cx server and also my DNS/DHCP server, and 10.0.0.1 is the router", but the screen shot of his LAN settings shows the IP address of his Linksys box as 10.1.1.5. I decided two weeks ago that I needed to move with the times and replace my existing (working!) Commander system - 8 extensions, 3 outside lines including one PSTN and two VoIP (the latter provided through the two analog ports on my VoIP modem/router). Having spent countless hours over the last two weeks getting to a point where the system is only still partly working has convinced me that I really should have stuck with what I had!