While you wait for answers, we may have found some information which could help you.
Success
Message
BT Studio 3500 base problem?
how to repair BT 3500 Studio phone base (Master) unit?
Beeping phone BT Studio 1100?
bt 1100 twin need to replace broken 2nd handset?
telephones?
How can i show calls made to my phone?
BT Studio 1500 triple set?
how do i record a telephone conversation on a bt synergi 5500 cordless anse?
How do I connect my own answering machine?
Permanent engaged tone on BT Studio 1100 handset?
how can i fix a bt graphite 1100phone?
Bt 3500 cordless tel/answerphone?