I just installed some Grandstream GXP2100 telefoons. We also use 3cxphone vs 12 on windows 7 pc's. With the old models, GXP20xx we could setup a call in the 3cxphone (CTI mode) and the gxp20xx phones would ring. After picking up the horn, the call was setup. With the gxp2100 telephones this doens'nt work anymore. I think I read this is not supported for Grandstream by 3cx, but even the siemens dect works with this option and old grandsteam Phones also. (dialing from 3cx Phone) Anyone an idear if this is a setting in the GXp2100 (or GXP1450, which also doesn't work) Phone I can enable to get this work? The firmware is 18.104.22.168 C.