JP2666253B2 - Additional dial system by PBX dial-in - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an additional dialing method by a PBX dial-in in a stored program controlled private branch exchange (stored program controlled PBX) which can receive a number information transfer service from a public network. . (Prior Art) The PBX dial-in service is a service that receives an extension designation signal from a public network and directly receives the signal at an extension telephone of the received PBX. (Problems to be Solved by the Invention) This service uses PBX as an extension designation signal from the public network.
Is not necessarily assigned to all extensions accommodated in the same office, even if it is possible to assign numbers for all extensions.
It is not always necessary to assign a number that matches the extension number accommodated in the PBX. This is because the numbering is a general telephone number of a public network and is not a numbering compatible with the PBX. In addition, PBXs usually require a large number of numbers to provide abundant service functions. For example, if the PBX numbering system is adapted to the public network numbering system, the PBX's feature of “free and flexible” A high exchange cannot be realized. An object of the present invention is to solve the above-mentioned drawbacks and provide an additional dialing method by PBX dial-in which can provide the above-mentioned PBX dial-in service to more extension telephones without impairing the original function of the stored program control type PBX. To provide. (Means for Solving the Problems) In order to achieve the above object, an additional dialing method by PBX dial-in according to the present invention is provided in a storage-program-controlled private branch exchange capable of receiving a number information transfer service from a public network. A register for receiving an extension designation signal and an additional dial signal from the public network sent by the information transfer service, and an extension designation signal received by the register for the extension number of the private branch exchange or other than the private branch exchange connected by a private line. A conversion circuit for converting an extension number accommodated in the private branch exchange or an extension designation signal received by the register as identification information for additional dialing, wherein the extension designation signal converted by the conversion circuit is used for the private branch exchange. If it is the extension number of the exchange, it is connected to the extension telephone of the private branch exchange, and the conversion circuit If the extension designation signal converted in the above is the extension number of a private branch exchange other than the private branch exchange connected by the private line, connect to the extension telephone of the private branch exchange other than the private branch exchange connected by the private line, When the extension designation signal converted by the conversion circuit is additional dial identification information, a communication path with the public network is formed, the additional dial is received by a PB signal by a public subscriber, and the received additional dial is When it is the extension number of the private branch exchange, it is connected to the extension telephone of the private branch exchange that has received the additional dial, and the received additional dial is accommodated in the private branch exchange connected to the private branch exchange that has received the extension designation signal by a dedicated line. If the extension number is the same as the extension number, the terminal is connected to the extension telephone. Next, the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a connection operation sequence of the dial-in PBX transfer method according to the present invention.
Is received by the central office trunk, a primary response signal is transmitted,
At the same time, a register for receiving the number information is captured.
Subsequently, since the number information based on the PB signal is sent from the public network CO as a selection signal, the register receives the number information. Upon receiving the number information, the PBX sends a reception completion signal to the public network. The public network CO transmits a ringing tone RBT to the calling subscriber of the public network upon receiving the reception completion signal. On the other hand, when the extension subscriber of the PBX responds, the secondary response signal is transmitted from the central office trunk to the public network, and the state shifts to a communication state with the public network subscriber. Here, the primary response signal and the secondary response signal are transmitted by closing the DC loop, and the reception completion signal is transmitted by disconnecting the DC loop. Although the above is a general method, the features of the present invention will be described in detail with reference to FIG. FIG. 2 is a diagram showing an example of the configuration of the extension designation signal conversion circuit. When a call is received from the public network, the register is captured, and the extension designation signal is stored in the register. This extension designation signal is converted into a conversion number or additional dial identification information by a development table of an extension designation signal conversion circuit. For example, assuming that a three-digit number "564" has been received as an extension designation number, respective tables of reception numbers 0 to 9 are prepared at the address "a" of the first numeral expansion table. At the position of the first numeral "5", the address b number of the next table is stored. 2nd of 2nd number expansion table
In the position of the numeral “6”, the address “c” of the third numeral expansion table is stored. Address d is stored at the position of the third numeral "4" in the third numeral expansion table, and a conversion number or additional dial identification information is registered in this address. If the additional dial identification information is ADD = 0, a conversion number is registered. In this case, the conversion number is "256", and an extension or a dedicated line corresponding to the conversion number is transmitted. At this time, the reception completion signal shown in FIG. 1 is sent to the public network. When the additional dial identification information is ADD = 1, a secondary response signal is transmitted in a pseudo manner at a certain timing after transmitting the reception completion signal. In this state, the public network and the PBX can talk, and the calling subscriber is notified that additional dialing is possible with the talkie connection. FIG. 3 shows a state in which the talkie 2 and the central office trunk 3 are connected, and the public network 4 is informed to that effect. Next, the PBX 1 connects the register 5 and the central office trunk 3 as shown in FIG. 4, and starts preparing for receiving a PB signal from a calling subscriber of the public network. When the additional dial number is received, it is analyzed and connected to the extension telephone 7 or to the dedicated line 6 as shown in FIG. The PBX monitors extension or leased line subscribers, and if they do not respond after a certain period of time, they are considering making an additional dialing again. It is necessary to previously register conversion information in the extension designation signal conversion table by input / output control or the like, and this conversion table can be rewritten at any time. (Effects of the Invention) As described above in detail, the present invention provides a storage program control type private branch exchange which can receive a number information transfer service from the public network, with a register for receiving an extension designation signal and an additional dial signal, and an extension designation signal. The provision of the conversion circuit has the effect that the extension of the PBX can be freely assigned by the additional dialing by the PBX dial-in, and the PBX can be transmitted from another station.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an operation sequence of an additional dialing system by PBX dial-in according to the present invention, FIG. 2 is a diagram showing an example of an extension designation signal conversion table, FIG. 3, FIG. FIG. 5 is a diagram showing a connection state of each sequence when additional dial information is registered. 1 Private branch exchange with program storage control 2 Talkie 3 Office trunk (COT) 4 Public network 5 Register 6 Private line 7 Extension

Claims (1)

(57) [Claims] A register for receiving an extension designation signal and an additional dial signal from the public network sent by the number information transfer service to a stored program controlled private branch exchange that can receive a number information transfer service from the public network; and an extension received by the register. The designated signal is converted into an extension number of the private branch exchange or an extension number accommodated in a private branch exchange other than the private branch exchange connected by a dedicated line, or the extension designation signal received by the register as additional dial identification information. If the extension designation signal converted by the conversion circuit is the extension number of the private branch exchange, it is connected to the extension telephone of the private branch exchange, and the extension designation converted by the conversion circuit is provided. If the signal is an extension number of a private branch exchange other than the private branch exchange connected by the dedicated line, Connect to an extension telephone of a private branch exchange other than the private branch exchange connected by a dedicated line, and if the extension designation signal converted by the conversion circuit is identification information for additional dial, form a communication path with a public network. , Receive additional dialing in PB signal by public subscribers,
When the received additional dial is the extension number of the private branch exchange, it was connected to the extension telephone of the private branch exchange that received the additional dial, and the received additional dial was connected to the private branch exchange that received the extension designation signal via a dedicated line. The PBX is configured to connect to the extension telephone when the extension number is accommodated in the private branch exchange.
Additional dialing method by dial-in.