EP-T25 and BMW Motorrad communication system

Hi everyone, I bought the EP-T25 headphones to use them on the bike as an intercom. I paired them with the BMW Motorrad TFT: everything ok, I can listen to music, I can start a phone call, but I hear nothing in the headphones and on the other side they do not hear me.
I can hear the music, but not the phone calls. Can anyone help me? The headphones, being A2DP, should be compatible with the BMW Motorrad communication system.
Thank you all