Private branch exchange

• US 6,707,897 B2
• Filed: 11/12/1998
• Issued: 03/16/2004
• Est. Priority Date: 03/13/1997
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Nishida, Toshio
• Primary Examiner(s): BUI, BING Q
• Application Number:
  US09/180,585
• Publication Number:
  US 20020048358A1
• Time in Patent Office: 1,951 Days
• Field of Search: 379/142, 379/225, 379/127, 379/201, 379/204, 379/142.01, 379/142.02, 379/142.09, 379/210.02, 379/210.03, 379/188, 379/198
• US Class Current: 379/188
• CPC Class Codes: H04M 2242/22 Automatic class or number identification arrangements
• CPC Class Codes: H04M 3/42042 Notifying the called party of information on the calling party details within substation equipment H04M1/57, signalling details H04Q3/72
• CPC Class Codes: H04M 3/42059 Making use of the calling party identifier
• CPC Class Codes: H04M 3/42314 in private branch exchanges
• CPC Class Codes: H04M 3/42331 Direct inward dialling
• CPC Class Codes: H04M 3/48 Arrangements for recalling a calling subscriber when the wanted subscriber ceases to be busy
• CPC Class Codes: H04Q 11/0435 Details
• CPC Class Codes: H04Q 2213/1309 Apparatus individually associated with a subscriber line, line circuits
• CPC Class Codes: H04Q 2213/13091 CLI, identification of calling line
• CPC Class Codes: H04Q 2213/13095 PIN / Access code, authentication
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13152 Callback
• CPC Class Codes: H04Q 2213/13175 Graphical user interface [GUI], WWW interface, visual indication
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/1322 PBX
• CPC Class Codes: H04Q 2213/13274 Call rejection, call barring
• CPC Class Codes: H04Q 3/62 for connecting to private branch exchanges
• CPC Class Codes: H04Q 3/625 : Arrangements in the private branch exchange
• CPC Class Codes: H04Q 3/74 : Identification of subscriber calling from a party-line

Abstract

A private branch exchange comprising means, including at least an extension terminal, for connecting the extension terminal to a communication network, means for transmitting to the communication network a call including information relating to a caller number, when a transmission call is made from the extension terminal, means for sending, when a call is received from the communication network and the call includes information on a number, the call to the extension terminal corresponding to the called number, memory means for storing information on a predetermined number which is preconfirmed to function as a called number for callback, determination means for determining, when a call has been received from the extension terminal, whether or not the predetermined number is obtained, which corresponds to a caller number received from the extension terminal or a caller number corresponding to the extension number, with use of the information stored in the memory means, and means for employing, when the acquisition of the called number has been determined by the determination means, the predetermined number as a caller number and transmitting transmission call information including information relating to the caller number to the communication network.

Claims

1. A private branch exchange comprising:

at least one extension circuit to which an extension terminal is connected via an extension line;

at least one trunk circuit connected to an office line;

memory means for storing information on a relationship between an extension number relating to the extension circuit and information relating to a reception call number, in association with the trunk circuit, the information relating to the reception call number enabling a callback to the extension terminal; and

sending means for sending the information relating to the reception call number as a caller number to the office line, when a call is transmitted from the extension terminal to the office line via the trunk circuit,

wherein in a case where a transmission call request is issued from the extension terminal to the office line, with one of the trunk circuit selected, if the memory means does not store information relating to a reception call number corresponding to an extension number of the extension terminal relating to the call, the sending means sends information on caller number presentation restriction to the office line.

2. The private branch exchange according to claim 1, wherein when the call is issued from the extension terminal, the sending means determines whether the reception call number corresponding to the extension circuit connected to the extension terminal relating to the call is stored.

3. The private branch exchange according to claim 2, wherein if the reception call number corresponding to the extension number is stored in the memory means, the reception call number is issued as a caller number to the communication network.

4. The private branch exchange according to claim 1, wherein the memory means stores information on the caller number permissible in the communication network, and

when a call has been issued from the extension terminal, the sending means determines, with use of the information stored in the memory means, whether the caller number corresponding to the extension number of the extension terminal relating to the call is a caller number permissible in the communication network.

5. The private branch exchange according to claim 4, wherein if the sending means has determined that the reception call number corresponding to the extension number is not a permissible caller number, the sending means sends a caller number presentation restriction to the communication network.

6. The private branch exchange according to any one of claim 1 or 2-5, wherein at least an exclusive line is included, and the sending means determines whether or not the reception call number corresponding to the exclusive line is obtained with respect to the caller number when a call is sent from the exclusive line to the communication network, and if the reception call number is obtained, the reception call number corresponding to the extension number is employed as the caller number and information relating to this caller number including transmission call information is transmitted to the communication network.

7. A private branch exchange comprising:

at least one extension circuit to which an extension terminal is connected via an extension line;

at least one trunk circuit connected to an office line;

memory means for storing information on a relationship between an extension number relating to the extension circuit and information relating to a connected party number, in association with the trunk circuit, the information relating to the connected party number enabling a callback to the extension terminal; and

sending means for sending the information relating to the connected party number to the office line, when the extension terminal responds to a call received by the extension circuit via the trunk circuit,

wherein in a case where a response request is issued from one of the extension terminals, if the memory means does not store information relating to the connected party number corresponding to an extension number of the extension terminal relating to the response, the sending means sends information on connected party number presentation restriction to the office line.

8. The private branch exchange according to claim 7, wherein when the extension terminal has responded to the reception call, the sending means determines whether or not the reception call number corresponding to the extension circuit connected to the extension terminal associated with the reception call is stored.

9. The private branch exchange according to claim 8, wherein if the reception call number corresponding to the extension number is stored in the memory means, the reception call number is sent to the communication network as the connected party number.

10. The private branch exchange according to claim 7, wherein the memory means stores information relating to a connected party number permissible in the communication network, and

the sending means, when the extension terminal has responded to a reception call, determines, with use of information stored in the memory means, whether the connected party number corresponding to the extension number of the extension terminal relating to the reception call is a connected party number permissible in the communication network.

11. The private branch exchange according to claim 10, wherein when the sending means has determined that the reception call number corresponding to the extension number is not a permissible connected party number, the sending means sends a connected party number presentation restriction to the communication network.

12. The private branch exchange according to any one of claim 7 or 8-11, wherein at least an exclusive line is included, and in a case where the exclusive line responds to a reception call, the sending means determines whether or not a number, which is preconfirmed to function as the reception call number for callback associated with the exclusive line, can be obtained with respect to the connected party number if the exclusive line has responded to the reception call, and if the sending means has determined that said reception number is obtained, the number which is preconfirmed to function as the reception call number for callback is employed as a connected party number and information on the connected party number is included in response information and transmitted to the communication network.

13. In a private branch exchange including at least two public lines and having a function of interconnecting the public lines automatically or manually, for every call incoming from a first public line and outgoing to a second public line, a caller number presentation restriction is sent to the second public line on an outgoing call side, irrespective of the presence or absence of a caller number received from the first public line on an incoming call side and irrespective of content of a caller number received from the first public line on the incoming call side.

14. In a private branch exchange including at least two public lines and having a function of interconnecting the public lines automatically or manually, for every response by a first public line on an outgoing call side to a call received from a second public line on an incoming call side, a connected party number presentation restriction is sent to the second public line, irrespective of the presence or absence of a connected party number received from the first public line and irrespective of content of a connected party number received from the first public line.

15. A private branch exchange comprising:

at least one extension circuit to which an extension terminal is connected via an extension line;

at least one trunk circuit connected to an office line;

memory means for storing information on a relationship between an extension number relating to the extension circuit and information relating to a reception call number, in association with an office line, the information relating to the reception call number enabling a callback to the extension terminal; and

sending means for sending the information relating to the reception call number as a caller number to the office line, when a call is transmitted from the extension terminal to the office line via the trunk circuit,

wherein in a case where a transmission call request is issued from the extension terminal to the office line, if the memory means does not store information relating to a reception call number corresponding to an extension number of the extension terminal relating to the call, the sending means sends information on caller number presentation restriction to the office line.

16. A private branch exchange comprising:

at least one extension circuit to which an extension terminal is connected via an extension line;

at least one trunk circuit connected to an office line;

memory means for storing information on a relationship between an extension number relating to the extension circuit and information relating to a connected party number, in association with an office line, the information relating to the connected party number enabling a callback to the extension terminal; and

sending means for sending the information relating to the connected party number to the office line, when a reception call transmitted from the extension terminal to the extension circuit via the trunk circuit is responded,

wherein in a case where a response request is issued from one of the extension terminals, if the memory means does not store information relating to the connected party number corresponding to the extension number of the extension terminal relating to the response, the sending means sends information on connected party number presentation restriction to the office line.