Switching control apparatus for a communication terminal having a voice terminal device and a non-voice terminal device

A switching control apparatus for a communication terminal, connected to a communication circuit, having a voice terminal device and a non-voice terminal device, which maintains a connection with said communication circuit upon reception of a calling signal by said communication terminal, wherein said apparatus comprises:

• (a) means for switching the connection with said communication circuit between said voice terminal device and said non-voice terminal device;
• (b) a call signal recognition detector which detects an incoming signal and distinguishes the incoming signal between a voice signal and a non-voice terminal call signal;
• (c) means for transmitting a voice response message to a calling party if no voice signal is detected by said call signal recognition detector within a predetermined time period immediately after the connection with said communication circuit is maintained;
• (d) means for urging a called party to respond by said voice terminal device when a voice signal is recognized after transmitting the voice response message;
• and
• (e) a control device which switches the connection of said communication circuit to said non-voice terminal device if neither the voice signal nor the non-voice signal is detected by said call signal recognition detector after the voice response message is transmitted;
• wherein said call signal recognition detector counts an ON-time of the incoming signal within a specified frequency range within a predetermined unit time period immediately after detecting the incoming signal, and determines the incoming signal to be a non-voice terminal call signal if the counted ON-time is less than a specified time duration percentage against the predetermined unit time period, and determines the incoming signal to be a voice signal if the counted ON-time is greater than said specified time duration percentage against the predetermined unit time period.

A switching control apparatus for a communication terminal, connected to a communication circuit, having a voice terminal device and a non-voice terminal device, which maintains a connection with said communication circuit upon reception of a calling signal by said communication terminal, wherein said apparatus comprises:

• (a) means for switching the connection with said communication circuit between said voice terminal device and said non-voice terminal device;
• (b) a call signal recognition detector which detects an incoming signal and distinguishes the incoming signal between a voice signal and a non-voice terminal call signal;
• (c) means for transmitting a voice response message to a calling party if no voice signal is detected by said call signal recognition detector within a predetermined time period immediately after the connection with said communication circuit is maintained;
• (d) means for urging a called party to respond by said voice terminal device when a voice signal is recognized after transmitting the voice response message;
• and
• (e) a control device which switches the connection of said communication circuit to said non-voice terminal device if neither the voice signal nor the non-voice signal is detected by said call signal recognition detector after the voice response message is transmitted;
• wherein said call signal recognition detector counts an OFF-time of the incoming signal within a specified frequency range within a predetermined unit time period immediately after detecting the incoming signal, and determines the incoming signal to be a non-voice terminal call signal if the counted OFF-time is greater than a specified time duration percentage against the predetermined unit time period, and determines the incoming signal to be a voice signal if the counted OFF-time is less than said specified time duration percentage against the predetermined unit time period.