T58A and Plantronics DECT CS540A

[schmidt_as]

Hello everybody,

I am unable to get the Plantronics CS540A headset to work with the T58A. I have the EHS40 adapter. You can make calls, but you cannot accept and hang up calls. If you want to take a call on the headset, you can hear the click of the relay in the DECT base. But the signal is not passed to the phone. What am I doing wrong here.

I look forward to your answers.
Alex