I read the whole manual before posting this but don't see it noticed. In Asterisk you can do device and user mode, so if I have an office plus my home, I can have an IP phone at both locations that I log into as a user, and then my extensions are shown on both phones so if someone calls me both ring etc. The other way I can do that is with follow me, where I could make a different extension for when I'm at home and then set my main extension to ring both when someone calls, and then to go to my main line voicemail if there's no answer. How would I do that in 3CX? The only thing I see is "ring my mobile simultaneously" but not to ring another extension. I thought maybe set up a ring group with both and set it to go to the main extension voicemail at the end, but then it doesn't look like I can set it to send an extension call to a ring group. The only thing I could think of is getting a separate DID for the home phone extension and entering that as my "mobile" number and then checking the box to ring simultaneously. Or am I completely missing it here and can just register more than 1 phone to 3CX at the same time?