JP3388443B2 - External line receiving method for key telephone equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for terminating an outside line in a key telephone apparatus having a function of accommodating an ISDN terminal or a terminal having a layer 3 interface similar to the ISDN terminal to an extension. It is about. 2. Description of the Related Art Conventionally, a key telephone device is provided with a main unit, and a plurality of terminals and a plurality of external lines are connected to manage data communication such as a telephone call and a facsimile.
In the key telephone apparatus, each call (or data communication) process is assigned a number called a call number and managed by the main unit. For example, when calling from a terminal, when dialing the other party's telephone number from the terminal, a call number is automatically added and sent to the main unit, and the main unit determines the call number, calling number (caller number), and other necessary information. Data is transmitted to an external line (communication network) as a call setting message. The main unit manages a series of processes until the end of the call (or until the data communication ends) with the same call number. When an ISDN terminal (or a terminal having a layer 3 interface similar to the ISDN terminal) accommodated in an extension of a key telephone apparatus receives an external line broadcast from an ISDN external line, the main unit transmits all the terminals that can receive the call. Sends a call setting message, such as a call number, to request call setting. During this time, the terminal is treated as a receiving state. When any of the terminals goes off-hook and responds, the main unit connects the terminal to an outside line and releases the other terminals from the receiving state. [0004] However, as described above, in the outside line receiving method in the conventional key telephone apparatus, when an external line broadcast incoming call is received from an external line and the terminal does not permit 2B simultaneous incoming call, any of the above methods is required. Until one terminal answers, the other terminals are also treated as receiving calls, and while receiving a broadcast call, it cannot accept the next incoming call, resulting in poor call processing efficiency. Was. [0005] The present invention has been made in view of the above points, and in order to eliminate the above problems, only a terminal that has first accepted call setting for an external line incoming call is selected as a receiving terminal. It is an object of the present invention to provide an external line receiving method in a key telephone apparatus with high efficiency of receiving processing by immediately releasing the terminal from the receiving state. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a main unit which accommodates a plurality of ISDN terminals or terminals having a layer 3 interface similar to the ISDN terminals in an extension line. In the external line receiving method in a key telephone apparatus having a device, when the main unit receives an external line incoming call from an external line, the main unit transmits a call setting message to all receivable terminals and returns a call setting accepting signal or a calling signal first. The incoming terminal is selected as an incoming terminal, incoming processing is performed, and other terminals are immediately released. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a diagram showing an example of a block configuration of a call number management system in a key telephone apparatus for implementing the outside line receiving method according to the present invention. As shown, the key telephone apparatus of the present invention includes a main unit 10 and a plurality of ISDN terminals (terminal 21, terminal 22,... In the figure), and a plurality of ISDN external lines (in the figure, external line 31, external line 3).
2, ...). The main unit 10 includes an external line interface unit 11 for connecting to a plurality of ISDN external lines, a system control unit 12 for controlling the entire key telephone apparatus, an internal line interface unit 13 for connecting to a plurality of ISDN terminals, It has a memory 14 for storing information, programs and the like. The memory 14 includes an extension control table 14-2 (in the figure, a control table 14-21 of the terminal 21 and a control table 14-22 of the terminal 22) and an external line control table 1
4-3 (in the figure, a control table 14-31 for the outside line 31;
A control table 14-32) for the outside line 32 is prepared. The extension control table 14-2 records information such as the state of each terminal, the connection destination, and the generated call number. The external line control table 14-3 records information such as the state, connection destination, and call number of each external line. FIG. 1 is a diagram showing an example of a sequence when an external line broadcast arrives. The outside line receiving method will be described with reference to FIG. When an incoming external line broadcast is received from the outside line 31, a call number is set from the outside line 31 and transmitted to the main device 10 (a).
The main device 10 stores all the receivable terminals (the terminal 21 and the terminal 2 in the figure) stored in the control table 14-31 of the outside line 31.
The call number is set for 2), and a call setting message is transmitted (b, c). Write. At this time, the terminal (terminal 21 in the figure) that has returned (d) the call setting acceptance signal earliest is selected as the receiving terminal, and a release signal is immediately sent to the other terminals 22 to control the terminal 22 in the control table. The terminal release information is written in the status column of 14-22. The main unit 10 returns a call setting acceptance signal to the outside line 31 (f), performs an incoming call process with the terminal 21, and displays an incoming call in the status column of the control table 14-21 of the terminal 21. Write information (g). At this time, if another incoming call is received from the outside line 32, a call number is set from the outside line 32 and sent to the main unit 10 (h). The main unit 10 stores the information in the control table 14-32 of the outside line 32, and is capable of receiving the terminal (the terminal 2 in the illustrated example).
A call number is set for 2) and a call setting message is transmitted (i). Hereinafter, incoming call processing is performed between the outside line 32 and the terminal 22. As described above, according to the embodiment of the present invention, main apparatus 10 transmits a call setup message to all receivable terminals in response to an incoming external line broadcast. Alternatively, the terminal that has returned the call signal is selected as the receiving terminal and the incoming call processing is performed, and the other terminals are immediately released, so that the incoming call processing can be immediately performed for the next incoming external line. As described above, according to the present invention, when a main unit receives an incoming external line broadcast from an external line, the main unit transmits a call setting message to all receivable terminals, and first receives the call setting message. The terminal that has returned the signal or the call signal is selected as the receiving terminal and the incoming call is processed, and the other terminals are immediately released, so that the incoming call can be immediately processed for the next incoming external line, and the incoming call processing efficiency can be improved. A good external telephone call receiving method for a key telephone device can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an example of a sequence when an external broadcast is received. FIG. 2 is a diagram showing an example of a block configuration of a call number management system in the key telephone apparatus of the present invention. [Description of Signs] 10 Main device 11 External line interface unit 12 System control unit 13 Internal line interface unit 14 Memory 14-2 Extension line control table 14-21 Terminal 21 control table 14-22 Terminal 22 control table 14-3 Outside line control table 14-31 Outside line 31 control table 14-32 Outside line 32 control table 21 Terminal 22 Terminal 31 Outside line 32 Outside line

Continuing on the front page (72) Inventor Kazuo Kitamura 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo East Nippon Telegraph and Telephone Corporation (72) Inventor Seiji Matsunami 3-15 Babacho, Chuo-ku, Osaka-shi, Osaka Nishi Nippon Telegraph and Telephone Corporation (72) Inventor Yoshinori Inoka 2-6-1 Kitamikata, Takatsu-ku, Kawasaki-shi, Kanagawa Nipponkoko Co., Ltd. (56) References JP-A-2000-41104 (JP, A) 11-298608 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04Q 3/58-3/62 H04M 11/00-11/10 H04M 3/42-3/58 H04M 1 / 00 H04M 1/253 H04M 1/72 H04M 1/738

Claims (1)

(57) [Claims] [Claim 1] A plurality of IS connected to an ISDN external line.
In an external line receiving method for a key telephone device having a main device that accommodates a terminal having a layer 3 interface similar to a DN terminal or an ISDN terminal in an extension, when the main device receives an external broadcast reception from the external line,
A call setup message is transmitted to all receivable terminals, the terminal that first returns a call setup acceptance signal or a call signal is selected as a called terminal, the incoming call is processed, and other terminals are immediately released. External call receiving method in the key telephone device.