While you wait for answers, we may have found some information which could help you.
Success
Message
Bt 4600 phone?
Problem with handsets?
Fix blank screen in cordless hand set CLP99483?
How can i get my handset to speak with the caller?
How can I mend my BT4600 (1+1) phone?
BT Studio 4500 cordless telephone?
BT 4600 twin one handset bot ringing?
Mute?
How can I repair my phone?
How do i clear the TAM?
Battery cover?
TAM FULL on Binatone 1420 Single, base holds old messages th?