Make sure under the phone configuration page you have selected the CKEM under the "Expansion Module Information" section. Also make sure the 9971 has downloaded the correct firmware that is on your call manager and not the out of the box firmware.
Version of firmware is sip9971-9-2-1 now. I've selected CKEM in the Expansion Module Information" section. But the module is still unavailable. If i try to insert module into the phone the following message appears on the screen "The phone is unable to power this accesssory". Power supply is implemented with PoE+ switch, and now only a few ports are active in it. Do you know what does this message mean? Thank you
It depends on the type of PoE switch which is used. We are using 3560 802.3AF switch so we do need a power cube to power the CKEM.