While you wait for answers, we may have found some information which could help you.
Click here for Studio 1100 Base
How can I get my telephone/answering machine (model 29870ge1-A)to work?
base 1 again?
binatone shield 6015 twin phone set?
Fix answer machine number?
flashing new message light when call has been answered?
BT Studio 1500 triple set?