US5649004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Private branch exchange
Assignee: Canon Inc
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Filing: 1995-06-06
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Granted: 1997-07-15
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Expires: 2015-06-06
Abstract
Abstract A private branch exchange so adapted that a plurality of call transfer addresses for an incoming call can be set for an ISDN terminal includes a controller having a decision unit for analyzing the incoming call and deciding an extension terminal that is to receive the incoming call, and a first transmitting unit for transmitting set-up messages to an ISDN extension interface. The ISDN extension interface accommodates a line connected to one or more ISDN terminals and has a second transmitting unit for transmitting a predetermined first message of the set-up messages to the terminal to which the set-up messages from the first transmitting unit are to be sent, a receiving unit for receiving a predetermined second message from the ISDN terminal that has received the first message, and a third transmitting unit for transmitting this received message to the controller. The controller further has an analyzing unit for analyzing a transfer-addressed number, notification of which is given by the ISDN terminal, contained in the message from the third transmitting unit of the ISDN extension interface, and a notifying unit for notifying a plurality of extension terminals, which correspond to the transfer-addressed number, of the incoming call via the ISDN extension interface.
Inventors
- 👤 Toshihiko Ikeno
- 👤 Nobuhiro Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:33
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/327; H04N1/32704; H04N1/32706; H04N1/32708; H04N1/3271; H04N1/32715; H04N1/32717; H04N1/32726; H04N1/32732; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0435; H04Q11/0457; H04Q2213/00; H04Q2213/13096; H04Q2213/13106; H04Q2213/1322; H04Q2213/13282
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
133 words
A private branch exchange comprising: detecting means for detecting that a call is originated by a digital extension terminal, the call including information to designate a plurality of extensions; managing means for managing status of the plurality of extensions designated in the information included in the call; determining means for referring to said managing means when said call is detected by said detecting means, thereby determining whether one or more of the plurality of extensions is capable of receiving said call; and control means for performing, when said determining means determines that one or more extensions capable of receiving said call exists in the plurality of extensions, a control to establish a communication link between said digital extension terminal and one extension of said one or more extensions capable of receiving said call.
Claim 2
Dependent Claim
133 words
A private branch exchange comprising: detecting means for detecting that a call is originated by a digital extension terminal, the call including information to designate a plurality of extensions; managing means for managing status of the plurality of extensions designated in the information included in the call; determining means for referring to said managing means when said call is detected by said detecting means, thereby determining whether one or more of the plurality of extensions is capable of receiving said call; and control means for performing, when said determining means determines that one or more extensions capable of receiving said call exists in the plurality of extensions, a control to establish a communication link between said digital extension terminal and one extension of said one or more extensions capable of receiving said call.
Claim 3
Dependent Claim
132 words
A private branch exchange comprising: detecting means for detecting that a call is originated by a digital extension terminal, the call including information to designate a plurality of extensions; managing means for managing status of the plurality of extensions designated in the information included in the call; determining means for referring to said managing means when said call is detected by said detecting means, thereby determining whether one or more of the plurality of extensions is capable of receiving said call; and control means for selecting, when said determining means determines that at least two available extensions which are capable of receiving said call exist, one of said at least two available extensions, and for performing a control to establish a communication link between said digital extension terminal and the selected extension.
Claim 4
Dependent Claim
132 words
A private branch exchange comprising: detecting means for detecting that a call is originated by a digital extension terminal, the call including information to designate a plurality of extensions; managing means for managing status of the plurality of extensions designated in the information included in the call; determining means for referring to said managing means when said call is detected by said detecting means, thereby determining whether one or more of the plurality of extensions is capable of receiving said call; and control means for selecting, when said determining means determines that at least two available extensions which are capable of receiving said call exist, one of said at least two available extensions, and for performing a control to establish a communication link between said digital extension terminal and the selected extension.
Claim 5
Dependent Claim
183 words
A private branch exchange comprising: detecting means for detecting that a call is originated by a digital extension terminal, the call including information to designate a plurality of extensions; managing means for managing status of the plurality of extensions designated in the information included in the call; determining means for referring to said managing means when said call is detected by said detecting means, thereby determining whether one or more of the plurality of extensions is capable of receiving said call; and control means for selecting, when said determining means determines that at least two available extensions which are capable of receiving the call exist, a first of the available extensions, calling said first selected extension, determining whether or not the first selected extension responds to the calling, selecting a second extension from among the available extensions to be called at predetermined time intervals if the first selected extension does not respond to the calling, and performing a control to establish a communication link between said digital extension terminal and said first or second selected extension whichever selected extension responds to the calling.
Claim 6
Dependent Claim
183 words
A private branch exchange comprising: detecting means for detecting that a call is originated by a digital extension terminal, the call including information to designate a plurality of extensions; managing means for managing status of the plurality of extensions designated in the information included in the call; determining means for referring to said managing means when said call is detected by said detecting means, thereby determining whether one or more of the plurality of extensions is capable of receiving said call; and control means for selecting, when said determining means determines that at least two available extensions which are capable of receiving the call exist, a first of the available extensions, calling said first selected extension, determining whether or not the first selected extension responds to the calling, selecting a second extension from among the available extensions to be called at predetermined time intervals if the first selected extension does not respond to the calling, and performing a control to establish a communication link between said digital extension terminal and said first or second selected extension whichever selected extension responds to the calling.
Claim 7
Dependent Claim
208 words
A private branch exchange comprising: first interface means for interfacing a plurality of extension terminals; second interface means for interfacing a digital terminal and communicating signals with said digital terminal in accordance with a predetermined procedure, said digital terminal being connected as an extension terminal; transmitting means for transmitting a first message to said digital terminal via said second interface means, the first message being for initially informing said digital terminal of an incoming call addressed to said digital terminal and establishing a communication link with said digital terminal, the transmission being in response to the incoming call addressed to said digital terminal; receiving means for receiving a second message in which transfer address information indicating a plurality of extension terminals can be set from said digital terminal after transmitting the first message, the second message being a response signal corresponding to the first message; analyzing means for analyzing the second message and thereby determining whether or not transfer address information indicating the plurality of extension terminals is set in the second message; and transferring means for transferring the incoming call to one of said plurality of extension terminals designated in the transfer address information of the second message in accordance with a determination by said analyzing means.
Claim 8
Dependent Claim
208 words
A private branch exchange comprising: first interface means for interfacing a plurality of extension terminals; second interface means for interfacing a digital terminal and communicating signals with said digital terminal in accordance with a predetermined procedure, said digital terminal being connected as an extension terminal; transmitting means for transmitting a first message to said digital terminal via said second interface means, the first message being for initially informing said digital terminal of an incoming call addressed to said digital terminal and establishing a communication link with said digital terminal, the transmission being in response to the incoming call addressed to said digital terminal; receiving means for receiving a second message in which transfer address information indicating a plurality of extension terminals can be set from said digital terminal after transmitting the first message, the second message being a response signal corresponding to the first message; analyzing means for analyzing the second message and thereby determining whether or not transfer address information indicating the plurality of extension terminals is set in the second message; and transferring means for transferring the incoming call to one of said plurality of extension terminals designated in the transfer address information of the second message in accordance with a determination by said analyzing means.
Claim 9
Dependent Claim
34 words
The exchange according to claim 4, wherein the transfer address information includes a set of extension information, the set of information indicating the plurality of extension terminals to which the incoming call is transferred.
Claim 10
Dependent Claim
39 words
The exchange according to claim 4, wherein the transfer address information includes plural sets of extension information, the plural sets of extension information indicating extension terminals of the plurality of extension terminals to which the incoming call is transferred.
Claim 11
Dependent Claim
53 words
The exchange according to claim 5, wherein said transferring means checks whether each of the plurality of extension terminals designated in the transfer address information is available for the call transfer, and transfers the incoming call to an available extension terminal of the plurality of extension terminals designated in the transfer address information.
Claim 12
Dependent Claim
19 words
The exchange according to claim 4, wherein said digital terminal is a terminal for an integrated services digital network.
Claim 13
Dependent Claim
230 words
A private branch exchange comprising: first interface means for interfacing a plurality of extension terminals; second interface means for interfacing a digital terminal and communicating signals with said digital terminal in accordance with a predetermined procedure, said digital terminal being connected as an extension terminal; transmitting means for transmitting a first message to said digital terminal via said second interface means, the first message being for initially informing said digital terminal of an incoming call addressed to said digital terminal and establishing a communication link with said digital terminal, the transmission being in response to the incoming call addressed to said digital terminal; receiving means for receiving a second message including information relating to a call transfer from said digital terminal after transmitting the first message, the second message being a response signal corresponding to the first message; recording means for recording a voice message from a caller of the incoming call; and control means for discriminating whether the information of the second message indicates a call transfer to said recording means or a call transfer to an extension terminal, and performing in accordance with the discrimination a control to connect a communication path corresponding to the incoming call to said recording means so as to record the voice message or a control to transfer the incoming call to an extension terminal designated in the information of the second message.
Claim 14
Dependent Claim
230 words
A private branch exchange comprising: first interface means for interfacing a plurality of extension terminals; second interface means for interfacing a digital terminal and communicating signals with said digital terminal in accordance with a predetermined procedure, said digital terminal being connected as an extension terminal; transmitting means for transmitting a first message to said digital terminal via said second interface means, the first message being for initially informing said digital terminal of an incoming call addressed to said digital terminal and establishing a communication link with said digital terminal, the transmission being in response to the incoming call addressed to said digital terminal; receiving means for receiving a second message including information relating to a call transfer from said digital terminal after transmitting the first message, the second message being a response signal corresponding to the first message; recording means for recording a voice message from a caller of the incoming call; and control means for discriminating whether the information of the second message indicates a call transfer to said recording means or a call transfer to an extension terminal, and performing in accordance with the discrimination a control to connect a communication path corresponding to the incoming call to said recording means so as to record the voice message or a control to transfer the incoming call to an extension terminal designated in the information of the second message.
Claim 15
Dependent Claim
45 words
The exchange according to claim 9, wherein the information of the second message includes transfer address information designating a plurality of extension terminals, and said control means transfers the incoming call to one of the plurality of extension terminals designated in the transfer address information.
Claim 16
Dependent Claim
235 words
A private branch exchange comprising; first interface means for connecting a plurality of extension terminals; second interface means for connecting a digital terminal as an extension terminal, and communicating digital signals with said digital terminal in accordance with a predetermined procedure, said digital terminal being connected as an extension terminal; transmitting means for transmitting a first message to the digital terminal via said second interface means, the first message being for initially informing said digital terminal of an incoming call addressed to said digital terminal and establishing a communication link with said digital terminal, the transmission being in response to the incoming call addressed to said digital terminal; receiving means for receiving a second message including information relating to a call transfer from said digital terminal after transmitting the first message, the second message being a response signal corresponding to the first message; reproducing means for reproducing a voice message; and control means for discriminating whether the information of the second message indicates a call transfer to said reproducing means or a call transfer to an extension terminal, and performing in accordance with the discrimination a control to connect a communication path to said reproducing means corresponding to the incoming call, so as to send the voice message to a caller of the incoming call or a control to transfer the incoming call to an extension terminal designated in the information of the second message.
Claim 17
Dependent Claim
235 words
A private branch exchange comprising; first interface means for connecting a plurality of extension terminals; second interface means for connecting a digital terminal as an extension terminal, and communicating digital signals with said digital terminal in accordance with a predetermined procedure, said digital terminal being connected as an extension terminal; transmitting means for transmitting a first message to the digital terminal via said second interface means, the first message being for initially informing said digital terminal of an incoming call addressed to said digital terminal and establishing a communication link with said digital terminal, the transmission being in response to the incoming call addressed to said digital terminal; receiving means for receiving a second message including information relating to a call transfer from said digital terminal after transmitting the first message, the second message being a response signal corresponding to the first message; reproducing means for reproducing a voice message; and control means for discriminating whether the information of the second message indicates a call transfer to said reproducing means or a call transfer to an extension terminal, and performing in accordance with the discrimination a control to connect a communication path to said reproducing means corresponding to the incoming call, so as to send the voice message to a caller of the incoming call or a control to transfer the incoming call to an extension terminal designated in the information of the second message.
Claim 18
Dependent Claim
41 words
The exchange according to claim 11, wherein the information includes transfer address information designating a plurality of extension terminals, and said control means transfers the incoming call to one of the plurality of extension terminals designated in the transfer address information.
References Cited (Backward Citations)
JPS58165469A
Cited
US4436962A
Cited
US4629831A
Cited
JPS60176354A
Cited
JPS60236352A
Cited
US4723273A
Cited
US4809321A
Cited
US5267307A
Cited
US5029196A
Cited
JPH02104157A
Cited
US4885769A
Cited
US5023868A
Cited
US5291549A
Cited
US5432846A
Cited
JPH0398361A
Cited
JPH03123295A
Cited
US5138655A
Cited
US5027341A
Cited
US5048080A
Cited
US5182766A
Cited
US5365582A
Cited
US5276731A
Cited
US5416834A
Cited
US5369695A
Cited
US5452349A
Cited
US5313459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-14 | 2001-01-13 | 2001-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-14 | 2005-01-13 | 2005-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-14 | 2009-01-13 | 2009-07-15 | $7700.00 | Window Closed / Lapsed |