JP3483097B2 - Communication status recognition method - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a communication state of a terminal,
In particular, the present invention relates to a method of recognizing the communication status of an extension terminal of a switching device connected to ISDN.

[0002]

2. Description of the Related Art Conventionally, the communication state of a terminal (calling state, releasing state, etc.) is such that when a call is actually made to the terminal, it is in a releasing state if an incoming call can be made, and is in a calling state if an incoming call cannot be made. , I could only judge as a result.

[0003]

As described above, the prior art is as follows.
There is a problem in that the call must be made without knowing the communication state of the other terminal, and the call is uselessly made to the terminal that cannot receive the call because of the call state.

It is an object of the present invention to provide a communication state recognition method capable of recognizing the communication state of a terminal without transmitting it to the terminal and enabling efficient communication.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a plurality of arbitrarily designated switching devices among a plurality of switching devices connected to an ISDN and extension terminals accommodated in the respective switching devices are provided. In a communication state recognition method for recognizing a communication state between extension terminals in a group consisting of and, a packet link is formed between switching devices in the group, and an extension terminal in a released state changes to a call state. The switching device that recognizes that the DT packet to which the identification information of the calling terminal and its accommodating switching device, the identification information of the receiving terminal and its accommodating switching device, and the call state identification information are added is sent to another switching device, and at the same time accommodating. The other switching device that receives the DT packet including the call state identification information displays the call state on each extension terminal accommodated. The switching device, which recognizes that the extension terminal in the talking state has changed to the released state, adds the identification information of the calling terminal and its accommodation switching device, the identification information of the receiving terminal and its accommodation switching device, and the release state identification information. D
The T packet is sent to other exchanges, and the extension status is displayed on the other extension terminals to be accommodated, and the other exchanges receiving the DT packet containing the release state identification information release the extension packets to the respective extension terminals to accommodate. It is characterized by displaying the state.

According to the present invention, when the extension terminal accommodated in the switching device in the group changes from the released state to the talking state or vice versa, this is notified to another switching device via the DT packet, and each switching device is notified. Is displayed on each extension terminal that accommodates this, the extension terminals in the group can always know which extension terminal can receive the call, and by making a call while avoiding the terminal in the call when making a call. It is possible to reduce unnecessary calls.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of a system to which the communication state recognition method of the present invention is applied. The exchanges A, B, PBX, business phones, etc., accommodating a plurality of extension terminals (telephones). C and D are connected to ISDN. Here, among the switching devices A to D, it is assumed that A, B, and C form one group together with the extension telephones housed in each, and the extension terminals in the group recognize the communication state. Show.

FIGS. 2 and 3 show a first embodiment of the present invention, in which an example of a telephone call between an extension telephone set in one exchange apparatus and an extension telephone set in another exchange apparatus is shown. (In FIGS. 2 and 3, only the necessary parts are described for the operation description).

First, the switching devices A, B and C form a packet link via ISDN.

From the extension telephone in the exchange device B to the exchange device C
In the case of connecting to the extension telephone in the inside, the exchange B adds the identification information of the exchange (B) and the identification of the extension telephone (outgoing) to the UUI (user / user information) of the call setting message. Make a call connection to.

FIG. 6 shows an example of UUI, each of which is an octet of "information element identifier" (information type, here, information indicating "UUI"), "information element length" (information content). The length, here, information indicating "variable length") and the protocol identifier, and the "information content" of the length indicated in the "information element length".

The identification information of the exchange is, for example, "00000001" (exchange A), "00000010" (exchange B), as one octet data.
Any one of "00000011" (switching device C) is written in the first octet of the "information content", and the identification information of the extension telephone is one octet or more data, for example, "00000001".
Any one of (extension number 1), "00000010" (extension number 2), "00000011" (extension number 3), ... is written after the second octet of the "information content".

When the call connection is completed by exchanging the response message and the response confirmation message, the exchange C stores the exchange (B) identification information and the extension telephone (outgoing) identification information, and the stored exchange (B) is stored. ) A DT packet having identification information and extension telephone (outgoing) identification information, switching apparatus (C) identification information and extension telephone (incoming) identification information, and state identification (call) information indicating a call state is added as a packet. Send to switching device A via the link.

FIG. 7 shows an example of the DT packet.
"General format identifier, logical channel group number", "logical channel number", "reception sequence number, more data display, transmission sequence number, packet type identifier", "packet type", "destination exchange device" No.
User data consisting of "source switching device No.", "extension number in own switching device", "communication partner switching device number", "extension number in partner switching device", and "status" It consists of

As shown in FIG. 8, the packet type is 1 octet of data, for example, "00000".
001 ”(packet in use) is written, and the destination switching device No., the source switching device No., and the communication partner switching device No. are each 1 octet data, for example,“ 00000001 ”(device A), "000
Either "00010" (apparatus B) or "00000011" (apparatus C) is written, and the extension number in the own exchange apparatus and the extension number in the partner exchange apparatus are data of 1 octet or more here. , For example "00
Any one of "000001" (extension 1), "00000010" (extension 2), "00000011" (extension 3), ... is written, and the state here is, for example, "00000001" (data of 1 octet). Either "call" or "00000010" (release) is written.

When the exchange A receiving the DT packet recognizes the status identification (call) information, the exchange (B) identification information and the extension telephone (outgoing) identification information and the exchange (C) identification information and the extension telephone ( (Incoming call) identification information is stored, and it is displayed on the display unit of the housed extension phone that the extension phone of the exchange device (B) (outgoing call) and the extension phone of the exchange device (C) (incoming call) are in a call state. . The display unit of the extension telephone is composed of an LED, a liquid crystal display, or the like.

Next, when the call between the extension telephone (outgoing call) of the exchange apparatus (B) and the extension telephone (incoming call) of the exchange apparatus (C) is terminated and the call is disconnected, the exchange apparatus C accumulates. The exchange device (B) identification information and the extension telephone (outgoing) identification information, the exchange device (C) identification information, the extension telephone (incoming) identification information, and the state identification (release) information indicating the release state are added. The transmitted DT packet is transmitted to the switching device A via the packet link.

When the exchange A receiving the DT packet recognizes the status identification (release) information, the exchange (B) identification information and the extension telephone (outgoing) identification information and the exchange (C) identification information and the extension telephone ( (Incoming call) identification information is deleted and displayed on the display of the extension telephone to be stored,
Extension telephone (call) of exchange device (B) and exchange device (C)
Clear the call status display with the extension telephone (incoming call).

Although not shown, other extension telephones in the exchanges B and C also display the call status and erase it in the same manner as described above.

FIGS. 4 and 5 show a second embodiment of the present invention. Here, an example of a call between extension telephones in one exchange device is shown (in FIGS. 4 and 5, for explanation of operation, Only the required parts are listed).

First, the switching devices A, B and C form a packet link via ISDN.

When the call connection from one extension telephone in the exchange C to the other extension is completed, the exchange C can identify the exchange (C) identification information, the extension telephone (outgoing) identification information, and the extension telephone (incoming). The DT packet to which the identification information and the state identification (call) information indicating the call state are added is transmitted to the switching devices A and B via the packet link.

When the exchanges A and B which have received the DT packet recognize the status identification (call) information, the exchanges (C) identification information, extension telephone (outgoing) identification information, and extension telephone (incoming) identification information are obtained. The fact that the extension telephone (calling) and the extension telephone (incoming call) of the exchange apparatus (C) are in a call state is displayed on the display portion of the extension telephone that stores and accommodates.

Next, when the call between the extension telephone (outgoing call) and the extension telephone (incoming call) of the exchange apparatus (C) is terminated and the call is disconnected, the exchange apparatus C receives the exchange apparatus (C) identification information. A DT packet to which extension telephone (outgoing) identification information, extension telephone (incoming) identification information, and state identification (release) information indicating a release state are added is transmitted to the switching devices A and B via a packet link. .

Upon receiving the status identification (release) information, the exchanges A and B receiving the DT packet recognize the exchange (C) identification information, the extension telephone (outgoing) identification information, and the extension telephone (incoming) identification information. The call status display between the extension telephone (outgoing call) and the extension telephone (incoming call) of the exchange apparatus (C), which is erased and displayed on the display unit of the extension telephone to be accommodated, is erased.

Although not shown, the other telephones in the exchange C also display the call status and erase the call status in the same manner as described above.

[0027]

As described above, according to the present invention,
Conventionally, it is possible to know in advance all the communication states of other extension terminals in the group that could not be known unless you actually make a call, and when you make a call, you can avoid making a call to a terminal in a call state, There is an advantage that efficient communication can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a system to which a communication state recognition method of the present invention is applied.

FIG. 2 is a connection sequence diagram showing a first embodiment of a communication state recognition method of the present invention.

FIG. 3 is a connection sequence diagram showing a first embodiment of a communication state recognition method of the present invention.

FIG. 4 is a connection sequence diagram showing a second embodiment of the communication state recognition method of the present invention.

FIG. 5 is a connection sequence diagram showing a second embodiment of the communication state recognition method of the present invention.

FIG. 6 is a diagram showing an example of user / user information.

FIG. 7 is a diagram showing an example of a DT packet.

FIG. 8 is a diagram showing an example of user data in a DT packet.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-60-70851 (JP, A) JP-A-3-174860 (JP, A) JP-A-6-62121 (JP, A) JP-A-2- 20194 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04M 3/00 H04Q 3/58 H04M 3/42

Claims (3)

(57) [Claims] 1. An extension terminal in a group configured by a plurality of arbitrarily specified switching devices among a plurality of switching devices connected to an ISDN and an extension terminal accommodated in each of the switching devices is set to communicate with each other. In the communication state recognition method for recognizing, a switching device that forms a packet link between the switching devices in the group and recognizes that the extension terminal in the released state has changed to the talking state is the calling terminal and its accommodating switching device. The DT packet to which the identification information, the identification information of the receiving terminal and its accommodating / switching device, and the call state identification information are added is sent to another switching device, and the call state is displayed on the other extension terminal to be stored, and the call state is set. The other switching device receiving the DT packet including the identification information displays the call state on each extension terminal accommodated, and the extension terminal in the call state is changed to the release state. The switching device recognizing that the DT packet to which the identification information of the calling terminal and its accommodating switching device, the identification information of the receiving terminal and its accommodating switching device, and the release state identification information are added, is sent to another switching device. A communication state recognition method, characterized in that the extension state is displayed on the other extension terminals, and the other switching device, which has received the DT packet including the release state identification information, displays the release state on each extension terminal accommodated. . 2. When connecting from an extension terminal accommodated in one switching device to an extension terminal accommodated in another switching device, the switching device accommodating the calling terminal identifies the switching device and identification information of the calling terminal. 2. The communication state recognition method according to claim 1, wherein a call setup message including the information is sent to a switching device accommodating the receiving terminal. 3. The communication state recognition method according to claim 1, wherein the release state is displayed by deleting the display of the call state.