While you wait for answers, we may have found some information which could help you.
Success
Message
BT 4600 twin one handset bot ringing?
BT Studio 4500 cordless telephone?
How do i clear the TAM?
How can I mend my BT4600 (1+1) phone?
How can I repair my phone?
Bt 4600 phone?
Battery cover?
BT 4600 phone problem?
How can i get my handset to speak with the caller?
Problem with handsets?
TAM FULL on Binatone 1420 Single, base holds old messages th?
Mute?