Hi, I recently changed from KPN to Alice and since them the telephone number of the person who calls me is not displayed (or an incorrectt number is displayed) on the screen of my telephone. I read that my telephone (Philips DECT 225) supports DTMF protocol. Alice help-desk told me that all I need to be able to see the telephone number of the caller is to set-up DTMF in my telephone. Can anybody tell me how do I have to set up this DTMF, as I could not find that in the instruction manual of the telephone? Thanks