While you wait for answers, we may have found some information which could help you.
How can i get my handset to speak with the caller?
How can I repair my phone?
How can I fix my Binatone 3505?
Free style 750?
BT 4600 twin one handset bot ringing?
How can I mend my BT4600 (1+1) phone?
TAM FULL on Binatone 1420 Single, base holds old messages th?
How can I fix my BT 4500 Cordless phone?