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