Hi, I have a siemens Hipath 3550 with HG1500 voip card installed. I want to build a gateway from 3cx to the hg1500. Is this possible and if yes, what is the best way to do this. :roll: I have seen a lot of manuals how to do this (sip trunking) from asteriks, but I would like to do this with the 3cx system. I'm aware that many of the features of the siemens system can be handeled by the 3cx system, but we invested quite a lot in siemens phones next to that we use this also for the ISDN lines, that we still prefer over a voip provider.