EHS36 Not Picking Up Phone

[gobenb]

I am having an issue with the EHS36, a Plantronics CS500 and a T42G/T46G.

I have the EHS hooked up the the phone via the EXT port. The EHS has the audio jack to the headset base. Then i have the special Plantronics RJ9/RJ11 cable connecting the headset base to the phones headset port.

If a call is received I hear nothing on the headset. if I press the button on the headset it does not pickup the call. I cannot end the call using the button on the headset. I cannot make a call on the headset unless the headset button on the phone and the button on the side of the headset have been pressed.

The phones are at the latest firmware approved by 3CX. The EHS is firmware 3.16.

I cant for the life of me figure out what I am missing.