JPH04320142A - Incoming signal system - Google Patents

Abstract

PURPOSE:To avoid multi-purpose utilization of a caller number and difficulty of hearing of the number by making a station exchange send a caller number to a private branch exchange and making the private branch exchange identify whether a call is local call or a toll call based on the caller number so as to revise a speech level. CONSTITUTION:When a call comes from a caller telephone set 11 in Tokyo to a private branch of exchange 13 in Osaka via a station exchange 12, a signal reception section 14 receives a caller number from the station exchange 12 and outputs '03' being a toll station number of Tokyo to a toll/local identification section 15. The identification section 15 compares the toll station number with a toll station number 06 registered in advance depending on the installed position to identify whether the call is a local call or a toll call and controls a level conversion circuit 16 in the case of the toll call. The circuit 16 increase the speech level automatically and the caller number received by the reception section 14 is connected by an extension telephone set 18 receiving the call via an exchange switch 17 and displayed on a display device. Thus, the caller number is used in multi-purpose and difficulty of hearing is avoided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dial-in incoming signal system from a central office exchange to a private branch exchange.

0002

2. Description of the Related Art FIG. 4 is a diagram showing a sequence when a call is received between a central office exchange and a private branch exchange. number, 2 is a ringing signal, 3 is a primary response signal, 4 is an extension designated reception completion signal represented by a DC loop disconnection, 5 is a secondary response signal represented by a DC loop, and 6 is a call in progress. be.

Next, the operation will be explained. When a paging signal 2 is sent from the central office exchange, the private branch exchange receives it and sends a primary response signal 3 to the central office exchange. Next, the central office exchange sends an extension designation number 1, and in response, the private branch exchange sends an extension designation reception completion signal 4. At the same time, the private branch exchange calls the designated extension telephone,
Returns a pseudo ringback tone to the calling party. When the designated extension telephone answers, the private branch exchange sends a secondary response signal to the central office exchange. As a result, a conversation is established between the calling party and the specified extension telephone.

0004

[Problem to be Solved by the Invention] In the conventional incoming call signaling system, only the designated extension number is sent from the central office exchange, so the private branch exchange not only knows the caller's number but also determines whether the call is local or long distance. I couldn't even recognize it. Also,
Even if a private branch exchange is equipped with a function to change the call level, it cannot distinguish between local and long-distance calls, so there is a problem in that the volume of long-distance calls is low and difficult to hear. The present invention has been made to solve the above-mentioned problems, and it is possible to recognize the caller number and the type of call (local or long distance) when receiving a call, and also solve the difficulty of hearing long distance calls. With the goal.

[0005]

[Means for Solving the Problems] The present invention provides an incoming call signal system in which an extension designation number sent from a central office exchange is received when a call is received, and an incoming call is displayed on a designated extension telephone of a private branch exchange. In addition to the extension designation signal that is sent out, the caller number is also sent out. Further, the private branch exchange is provided with a level change means for changing the call level with the central office exchange, and an identification means for identifying whether the call is a local call or a long distance call based on the received caller number, and the identification result of the identification means is The level changing means is controlled according to the level.

[0006]

[Operation] In the present invention, the central office exchange sends the caller number to the private branch exchange. The private branch exchange identifies whether the call is a local call or a long distance call based on the caller number, and changes the call level based on the identification result.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a sequence diagram showing an embodiment of the incoming call signal system according to the present invention, and the same parts as in the conventional sequence of FIG. In the figure, 7 is a caller number, which is sent from the central office exchange to the private branch exchange following the extension designation number 1. When the private branch exchange receives extension designation number 1 and caller number 7, it sends an extension designation reception completion signal 4 to the central office exchange, and then sends a secondary response signal 5.
will be sent and the call will be in progress.

FIG. 2 is a system configuration diagram of the incoming signal system according to the present invention, in which 11 is a calling side telephone, 12 is a central office exchange, 1
3 is a private branch exchange, 14 is a signal receiving section, 15 is a local/outside identification section, 16 is a level variable circuit, 17 is an exchange switch, 1
8 is an extension telephone. In the figure, for example, when a call is received from a telephone 11 in Tokyo to a private branch exchange 13 in Osaka via a central office exchange 12, the signal receiving unit 14
Receive caller number 7 from 2 and enter Tokyo area code 03.
" is output to the city/outside area identification section 15. City/outside area identification section 1
5 is the Osaka area code registered in advance according to the installation location.
06'' to identify whether the call is a local call or a long distance call, and in the case of a long distance call, the level variable circuit 16 is controlled. This automatically raises the call level and eliminates the difficulty of hearing long-distance calls. Further, the caller number 7 received by the signal receiving section 14 is transmitted to the extension telephone 18 that received the call through a circuit not shown, and the caller number is displayed on the display of the extension telephone.

[0009] When combined with a call waiting service, the caller's number is displayed on the display when the called party is busy, so the operator on the called party can confirm the caller's number on the display and respond to subsequent calls. You can decide whether to respond or not.

FIG. 3 is a sequence diagram according to another embodiment of the present invention, which differs from the conventional sequence diagram in FIG. 4 in that the central office exchange sends caller number 7 to the private branch exchange instead of extension number 1. The operations after the private branch exchange receives the caller's number are the same as in the above case.

[0011]

As described above, according to the present invention, the caller number is transmitted from the central office exchange, so the caller number can be used for a variety of purposes, including display, on the receiving side. Furthermore, by recognizing long-distance calls and changing the call level at the receiving side's private branch exchange, it is possible to eliminate the difficulty of hearing long-distance calls.

[Brief explanation of drawings]

FIG. 1 is a sequence diagram showing an embodiment of an incoming signal system according to the present invention.

FIG. 2 is a system configuration diagram of an incoming call signaling system according to the present invention.

FIG. 3 is a sequence diagram showing another embodiment of the incoming signal system according to the present invention.

FIG. 4 is a sequence diagram showing a conventional incoming signal system.

[Explanation of symbols]

1 Extension designation signal 2 Call signal 3 Primary response signal 4 Extension designated reception completion signal 5 Secondary response signal 6 During a call 7 Caller ID

Claims (2)

[Claims] Claim 1: In an incoming call signal system in which an extension designation number sent from a central office exchange is received when a call is received, and an incoming call is displayed on a designated extension telephone of a private branch exchange, in addition to the extension designation signal sent from the central office exchange, An incoming call signal system characterized by transmitting a caller's number together with the caller's number. 2. The private branch exchange includes level changing means for changing the call level with the central office exchange, and identification means for identifying whether the call is a local call or a long distance call based on the received caller number, An incoming call signal system characterized in that the level changing means is controlled according to the identification result of the means.