Canon C70 - Manual (Page 5)

Preface v
5. If the supply cord of this equipment is damaged, it must be replaced
by the special cord (Parts No.: HH2-1910).
6. Not all standard telephones will respond to incoming ringing when
connected to the extension socket.
7. This device may be subject to bell tinkle, or mistakenly enter receive
mode when calls are made from another device on the same line. If
this occurs, the problem should not be referred to the Telecom Faults
service.
8. Please note when you connect an extension phone to this device, if
you use an extension phone which has features such as “last number
redial”, redial memory numbers may be lost.