We have Vonage as a VOIP provider with 3 VOIP lines. I wanted to use 3CX as a PBX to be able to have a virtual receptionist plus extensions to transfer calls to and between extensions. Vonage limits us a GREAT deal. They disable all access to the VOIP Phone settings both for VOIP Phones and routers and they will not give out the username and passwords for any of the lines. The only workaround is to use a Vonage softphone which then must have a username and password. So, basically, we purchased a new line with them (4 lines total now) just to have 1 Softphone line and be able to set that line as an extension and a VOIP line in 3CX. We also created 3 other extensions that corresponds to our 3 other Vonage lines but that can never register with the 3CX system. In each of those extensions we activated the "Forward All" rule and we forward to the phone number associated to that line. All of that works, except for one major flaw, the transfered calls do not free the main 3CX line. So if we are on a call, nobody can call in because the 3CX associated line is busy even though a transfer was used to get to another line. Is there anybody that can tell me a way of "hacking" into the vonage phones to get them to be "real" extensions? Or more probably, to get the line to free itself once a transfer is made? Thanks!