We may have found other answers which could help you.
Click here for Incoming Calls RingRCA 25255RE2 Corded phone?
How can I fix my princess phone, push button 1950s design?
Binatone 1900?
Bt Duet 700?
How can I fix my Binatone 3525 phone?
Instructions Manual Bench Corded Telephone KH 5001?