Patent ID: 6151389
Filing Date: 2000-11-21
Classification: H04M

Abstract:
A telephone comprising:a keyboard having a set of function buttons;a CPU (central processing unit);at least two telephone lines each connected to a respective ringing circuit, said at least two telephone lines each having a switch respectively connected to said CPU;a talking circuit connected to said at least two telephone lines through a switch having an input end connected to a first contact at an output end of the switch at each of said telephone line;a hand-free circuit connected to said at least two telephone lines through a switch having an input end connected to a second contact at the output end of the switch at each of said telephone line;wherein when said at least two telephone lines are busy, the function buttons of said keyboard are operated to drive said CPU to output control signals to the switches at said at least two telephone lines, said talking circuit and said hand-free circuit, enabling one of said at least two telephone lines to be connected to said hand-free circuit or said talking circuit, so that said talking circuit and said hand-free circuit can be independently operated.