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