Trying to link my ComPilot to my Gigaset 850A DECT telephone. I put my ComPilot in pairing mode, the telephone searches and finds the Phonak ComPilot and offers me to "Trust device", I key OK, it then asks for the passcode, so I key in 0000 (four zeros) and the telephone reports that the passcode is invalid. So I can't connect my ComPilot to my DECT phone.

Suggestions please.