EP0489619A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Private branch exchange
Assignee: Canon Inc
•
Filing: 1991-11-26
•
Granted: —
•
Expires: 2011-11-26
Abstract
Abstract A method of deciding whether an extension terminal is called or not is provided. The kind of communication is recognized on the basis of a set-up message received from the ISDN. Whether the extension terminal is called or not is decided on the basis of the result of comparison between the kind of the extension terminal and the kind of the communication recognized. There is also provided a private branch exchange comprising: a detector to detect a reception from an analog external line; a digital interface to connect a terminal corresponding to a procedure for a digital line; and a judging circuit to judge whether the terminal corresponds to a procedure for an analog line or not, wherein when the judging circuit decides that the terminal corresponds to the procedure for the analog line when the reception is detected by the detector, the digital interface transmits the set-up message to the terminal.
Inventors
- 👤 Shigeki C/O Canon Kabushiki Kaisha Sakurai
- 👤 Shoichi C/O Canon Kabushiki Kaisha Takashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 04:25
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625; H04Q3/627
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A method of deciding whether an extension terminal is called or not, comprising the steps of: recognizing the kind of communication on the basis of a set-up message received from the ISDN; and determining whether the extension terminal is called or not on the basis of the result of comparison between the kind of said extension terminal and the kind of said communication recognized in said recognizing step.
Claim 2
Dependent Claim
63 words
A method according to claim 1, wherein in the case where it is recognized in said recognizing step that a transmission ability information element included in the set-up message received from the ISDN indicates a speech, in said determining step, it is determined that the set-up message is not transmitted so long as the kind of said extension terminal indicates a G4 facsimile.
Claim 3
Dependent Claim
65 words
A method according to claim 1, wherein in the case where it is recognized in said recognizing step that a high-order layer characteristic discrimination element included in the set-up message received from the ISDN indicates a G3 function, in said determining step, it is determined that the set-up message is not transmitted so long as said extension terminal doesn't have the G3 facsimile communicating function.
Claim 4
Dependent Claim
65 words
A method according to claim 1, wherein in the case where it is recognized in said recognizing step that a high-order layer characteristic discrimination element included in the set-up message received from the ISDN indicates a G4 function, in said determining step, it is determined that the set-up message is not transmitted so long as the kind of said extension terminal indicates a G4 facsimile.
Claim 5
Dependent Claim
67 words
A method according to claim 1, wherein in the case where it is recognized in said recognizing step that a transmission ability information element included in the set-up message received from the ISDN indicates non-limited digital, in said determining step, it is determined that the set-up message is not transmitted so long as the kind of said extension terminal indicates a special terminal for use in communication.
Claim 6
Dependent Claim
31 words
A method according to claim 1, wherein in said recognizing step, the kind of communication is recognized on the basis of a transmission ability information element included in the set-up message.
Claim 7
Dependent Claim
32 words
A method according to claim 1, wherein in said recognizing step, the kind of communication is recognized on the basis of a high-order layer characteristic discrimination element included in the setup message.
Claim 8
Dependent Claim
85 words
A private branch exchange comprising: detecting means for detecting a reception from an analog external line; a digital interface to connect a terminal corresponding to a procedure for a digital line; and judging means for judging whether said terminal corresponds to a procedure for an analog line or not, wherein when said judging means decides that the terminal corresponds to the procedure for the analog line when the reception is detected by the detecting means, said digital interface transmits a set-up message to the terminal.
Claim 9
Dependent Claim
35 words
An exchange according to claim 8, wherein when the judging means determines that the terminal doesn't correspond to the procedure for the analog line, the digital interface doesn't transmit the setup message to the terminal.
Claim 10
Dependent Claim
30 words
An exchange according to claim 8, wherein said procedure for the digital line includes a G4 facsimile procedure and the procedure for the analog line includes a G3 facsimile procedure.
Claim 11
Dependent Claim
18 words
An exchange according to claim 8, wherein the digital interface transmits the set-up message to a G3/G4 facsimile.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.