Call waiting notifying apparatus

A telephone exchange apparatus, comprising:

• connecting means for connecting an exclusive telephone and an analog telephone;
• input means for supplying a communication signal from a communication channel of a digital line to the analog telephone in communication via the digital line;
• generating means for generating a predetermined tone indicative of a generation of a call waiting from a control channel of the digital line;
• and
• transmitting means for synthesizing the communication signal supplied from the input means and the predetermined tone and for transmitting a synthesized signal to the analog telephone in accordance with an incoming call from the control channel of the digital line.

A call waiting notifying apparatus comprising:

• analyzing means for analyzing a calling party identification in a case where a call waiting has been generated;
• selecting means for selecting one of a plurality of predetermined repeatedly-intermittent tones in accordance with the calling party identification;
• and
• notifying means for notifying a called party of the call waiting by using the selected repeatedly-intermittent tone.

A key telephone main unit comprising:

• exchanging means which can connect a digital line, an exclusive telephone, and a single analog telephone;
• and
• generating means for generating a tone indicative of a generation of a call waiting,
• wherein when a call reception is generated from a control channel of the digital line and the single analog telephone is in communication using a communication channel of the digital line, the exchanging means transmits, to the single analog telephone, a signal in which a communication signal to the single analog telephone and the tone from said generating means are synthesized.

A method for notifying a call waiting in a private exchange apparatus to one of a plurality of extension terminals which is in communication via a digital external line, comprising the steps of:

• (a) sending a predetermined tone to one of the plurality of extension terminals, in accordance with an incoming call from a control channel of the digital external line;
• (b) sending a communication signal from the communication channel of the digital external line to the one of the plurality of extension terminals, after the predetermined tone is sent to one of the plurality of extension terminals during a first predetermined time;
• (c) sending the predetermined tone to one of the plurality of extension terminals, after the sending of the communication signal to the extension terminal sent to one of the plurality of extension terminals;
• and
• (d) returning to said step (b) and repeating said step (b) and said following steps.

A call waiting notifying method of a telephone exchange apparatus to which an exclusive telephone and an analog telephone are connected, comprising the steps of:

• detecting a call waiting to the analog telephone based on a call from a control channel of a digital line and communication performed by the analog telephone via a communication channel of the digital line;
• synthesizing a communication signal to be transmitted from the communication channel of the digital line to the analog telephone and an audio signal for notifying the call waiting;
• and
• transmitting the communication signal and the audio signal synthesized in said synthesizing step to the analog telephone.

An incoming call notifying method of a telephone exchange apparatus to which an exclusive telephone and an analog telephone are connected, comprising the steps of:

• detecting an incoming call from a control channel of a digital line;
• synthesizing an incoming call notifying signal and a communication signal to be transmitted from the communication channel of the digital line to the analog telephone in communication via the communication channel of the digital line;
• and
• transmitting the incoming call notifying signal and the communication signal synthesized in said synthesizing step to the analog telephone in communication.

A telephone exchange apparatus comprising:

• connecting means for connecting a plurality of analog terminals;
• detecting means for detecting an incoming call from a control channel of a digital line in a case where one of the plurality of terminals is in communication via a communication channel of the digital line;
• and
• transmitting means for transmitting a predetermined tone to one of the plurality of terminals which is in communication via the communication channel of the digital line in accordance with the incoming call from the control channel of the digital line detected by said detecting means in the case where one of the plurality of terminals is in communication via the communication channel of the digital line.