Hi, I've installed a 3cx pbx v11 with some grandstream phones and with panasonic dect phones kx-tgp500. There is a problem I think with the portable (panasonic) phones. When a user goes thru the digitl receptionist and finally it rings at an extension. When he takes the call in most cases it works, but 10 times a day he takes the call and hears "Hi I'm cal....." and connections breaks. His customer has to call back and sometimes this happens few times with the same caller. Calling outside works perfect, or once the connection is made and he can talk longer then a few seconds the call doesn't disconnects. Setup : server : WINDOWS 8 3CX : V11 ISDN : Patoon gateway 4638 fix phones : grandstream gxp 2124 dect phones : panasonic kx-tgp500 WHat I've tried : - Updated to latest firmware of the panasonic phones - downgrade to earlier version - updated patton to latest firmware But problem still stays the same, Anybody got an idea ? I can provide a verbose log if needed.