JPS63296448A - System for calling telephone exchange - Google Patents

Abstract

PURPOSE:To prevent the misunderstanding whether a line is busy or the party is absent and to execute service improvement to a subscriber by hearing the signal sound under the same conditions as those of the subscriber to execute the receiving first when the receiving is executed to a telephone subscriber in a condition during the calling. CONSTITUTION:When a subscriber 10 calls on a telephone to a subscriber 9, a calling sound is sent to the subscriber 9, a sound during a calling is sent to the subscriber 10, and information LENb of the subscriber is then recorded to a first priority area 6 of an information storing memory 5. In such a condition, when the subscriber 11 calls a telephone to the subscriber 9, the subscriber 9 is not changed, the sound during the calling is sent even to one side subscriber 11 in the same way as the subscriber 10 and information LENc of the subscriber is recorded in a second priority area 7 of the information storing memory 5. To the information LENc of the subscriber, a timing 17 during the calling is set, when >= 30 seconds pass, switched from the sound during the calling to the busy tone to the subscriber 11 and deleted from the second priority area 7 of the information storing memory 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a telephone exchange calling system, and in particular, when a call is received to a telephone subscriber who is in a ringing state, the status of the called subscriber is communicated to the caller. Concerning telephone exchange calling system.

[Conventional technology]

Conventionally, in this type of paging system, when a call is received from a telephone subscriber who is in a ringing state, the caller is informed of the status of the called subscriber using a busy tone.

[Problem that the invention seeks to solve]

In the conventional calling method described above, when a call is received to a calling subscriber, a busy tone is set, so if the calling subscriber is away and unable to answer, the subscriber who knows that the call is busy will receive a busy tone. I misunderstand whether someone is busy or not home. In addition, there is a risk that the call will be made again due to the busy tone, and the line may be put on hold.

[Means for solving problems]

The telephone exchange calling system of the present invention provides a third subscriber call during a second subscriber call.
When a subscriber attempts to receive a call from the second subscriber who is in a ringing state, the third subscriber receives a signal tone with the same conditions as the first subscriber who initially attempted to receive the call from the second subscriber. It is characterized by having subscribers listen to it.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Figures 1(a) to 1(f) are state transition diagrams showing one embodiment of the present invention.6 In each figure, 1 is a telephone exchange;
3 is a network that connects subscribers and between subscribers and trunks; 3 is a paging trunk (RG-T) that calls subscribers;
4 is a trunk (RBT> that indicates that a call is in progress), 5 is an information storage memory corresponding to subscriber (A) 9, 6.7.8 is a 1.2.3 priority area in the information storage memory 5, 9, 10
゜11, j2 are telephone subscribers (A, B, C.

D), 13 is a trunk for transmitting busy tone (BTT), 1
4, 15.16 are telephone subscriber information (LENb, LENc) corresponding to subscribers 10, 11.12.

LENd), 17 indicates that the ringing timing T has been set. '0' at 18 indicates that there is no telephone subscriber information.Also, an arrow at 19 indicates a change in status.

FIG. 1(a) shows a state in which when subscriber 10 calls subscriber 9, a ring tone is sent to subscriber 9 and a ringing tone is sent to subscriber 10. Information LENb
is recorded in the first priority area 6 of the information storage memory 5.

When subscriber 11 calls subscriber 9 in this state, subscriber 9 remains in the same state, but one subscriber 1
Similarly to the subscriber 10, a ringing tone is transmitted to the subscriber 1, and the subscriber's information LENc is stored in the second priority area 7 of the information storage memory 5.
recorded in Further, the calling timing 17 (for example, 30 seconds) is set for the subscriber's information LENC,
The result will be as shown in Figure 1(b).

If more than 30 seconds have passed in this state, the ringing tone is switched to the busy tone for the subscriber 11, and the first
It will look like figure (c).

Returning to FIG. 1(b), subscriber 12 is subscriber 9 in the same way.
When calling, the same process as subscriber 11 is performed, a ringing tone is heard, and the subscriber's information L E 'N d
is recorded in the third ff destination area 8 of the information storage memory 5,
The result will be as shown in Figure 1(d). In FIG. 1(d), when the subscriber 10 disconnects, the subscriber 10 is disconnected from the ringing trunk 4 and deleted from the first priority area 6 of the information storage memory 5. Then, the subscribers 11 and 12 move to the first and second priority areas 6.7 of the information storage memory 5, and the calling timing 17 of the subscriber 11 is reset and becomes the first priority area as shown in FIG. 1(e). It will look like this. If Figure 1 (
If the subscriber 9 responds in e), the subscriber 9 is connected to the first priority subscriber 11 in the information storage memory 5 and can talk. On the other hand, for the subscriber 12 who is in the ringing tone, the tone is switched to busy tone. Also, the information storage memory 5 is completely deleted and the information storage memory 5 is deleted as shown in FIG.
f).

〔Effect of the invention〕

As explained above, according to the present invention, when an attempt is made to receive a call from a telephone subscriber who is in a ringing state, by hearing a signal tone with the same conditions as the subscriber who first tried to receive the call, it is possible to determine whether the subscriber is busy or not. This allows for improved services for subscribers without any misunderstanding.

[Brief explanation of drawings]

FIGS. 1(a) to 1(f) are state transition diagrams showing one embodiment of the present invention. 1...Telephone exchange, 2...Network, 3...
Calling trunk, 4... Calling trunk, 5... Information storage memory, 6... First priority area, 7... Second priority area, 8... Third priority area, 9.10. 11.
1. ．． 2...Telephone subscriber, 13...Busy trunk. , <”゛Representative Patent Attorney Ashi Uchihara (-／′

Claims (1)

[Claims] If a third subscriber tries to receive a call to the second subscriber in the ringing state while the second subscriber is calling, the first subscriber who tried to call the second subscriber first A telephone exchange calling system characterized in that the third subscriber is made to hear a signal tone under the same conditions.