So, I have 3cx up and running. I am using a Cisco 2651 with an analog line plugged into an FXO port, all works as planned. I am also using Exchange 2010 Unified Messaging as my voicemail. My router also has an FXS port which I have connected to my hard wired analog ports. If I don't have a voicemail account setup for the FXS analog ports, i can call the extension and it rings the phones, but if I enable voicemail the call goes directly to voicemail. I believe because in the extension properties there is an option on what to do if your phone is busy or unregistered, being it is an FXO port it shows as unregistered. There is not an option to ignore registration (at least what I can find) anyone have any ideas on how to get around this? Ideally I would want the analog port to behave the same as a sip phone, after so many seconds unanswered it goes to voicemail. The process is as follows, a call comes in and is answered by the exchange auto attendant, which provides a menu selection. One of those options is to ring the house phones.