Digital key telephone system and extension terminal device thereof

• US 6,496,576 B2
• Filed: 06/01/2001
• Issued: 12/17/2002
• Est. Priority Date: 02/13/1996
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Watanabe, Takashi, Tanaka, Toshiaki, Kawauchi, Yoshihiro, Mano, Hiroshi, Masaki, Nobuhiro, Nagano, Yoshihito, Suwa, Terunori, Kimura, Setsuo, Tsurusaki, Masayuki, Komuro, Isaku
• Primary Examiner(s): TIEU, BINH KIEN
• Application Number:
  US09/870,680
• Publication Number:
  US 20010026611A1
• Time in Patent Office: 564 Days
• Field of Search: 379/156, 379/157, 379/162, 379/163, 379/164, 379/165, 379/179, 379/183, 379/187, 379/198, 379/209, 379/265.01, 379/265.13, 379/93.06
• US Class Current: 379/156
• CPC Class Codes: H04M 1/57 Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set at the operator set in a manual exchange H04M5/20
• CPC Class Codes: H04M 2201/38 Displays
• CPC Class Codes: H04M 2207/08 ISDN systems
• CPC Class Codes: H04M 2242/22 Automatic class or number identification arrangements
• CPC Class Codes: H04M 3/22 Arrangements for supervision, monitoring or testing
• CPC Class Codes: H04M 3/26 with means for applying test signals or for measuring
• CPC Class Codes: H04M 3/42 Systems providing special services or facilities to subscribers specially adapted for wireless communication networks H04W4/00
• CPC Class Codes: H04M 3/42059 Making use of the calling party identifier
• CPC Class Codes: H04M 3/42127 Systems providing several special services or facilities from groups H04M3/42008 - H04M3/58
• CPC Class Codes: H04M 3/42195 Arrangements for calling back a calling subscriber when the wanted subscriber ceases to be busy H04M3/48
• CPC Class Codes: H04M 3/42314 in private branch exchanges
• CPC Class Codes: H04M 3/42323 PBX's with CTI arrangements
• CPC Class Codes: H04M 3/428 Arrangements for placing incoming calls on hold
• CPC Class Codes: H04M 3/4283 Call holding circuits
• CPC Class Codes: H04M 3/533 Voice mail systems
• CPC Class Codes: H04M 3/58 Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party substation line holding circuits H04M1/80
• CPC Class Codes: H04M 9/00 Arrangements for interconnection not involving centralised switching
• CPC Class Codes: H04M 9/002 with subscriber controlled access to a line, i.e. key telephone systems
• CPC Class Codes: H04Q 1/028 Subscriber network interface devices
• CPC Class Codes: H04Q 1/10 Exchange station construction
• CPC Class Codes: H04Q 11/0407 : using a stored programme control
• CPC Class Codes: H04Q 2201/10 : Housing details
• CPC Class Codes: H04Q 2201/806 : in PBX or KTS systems
• CPC Class Codes: H04Q 2213/13003 : Constructional details of switching devices
• CPC Class Codes: H04Q 2213/13034 : A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13036 : Serial/parallel conversion, parallel bit transmission
• CPC Class Codes: H04Q 2213/13076 : Distributing frame, MDF, cross-connect switch
• CPC Class Codes: H04Q 2213/1308 : Power supply
• CPC Class Codes: H04Q 2213/13091 : CLI, identification of calling line
• CPC Class Codes: H04Q 2213/13093 : Personal computer, PC
• CPC Class Codes: H04Q 2213/13096 : Digital apparatus individually associated with a subscriber line, digital line circuits
• CPC Class Codes: H04Q 2213/13097 : Numbering, addressing
• CPC Class Codes: H04Q 2213/13102 : Common translator
• CPC Class Codes: H04Q 2213/13103 : Memory
• CPC Class Codes: H04Q 2213/13106 : Microprocessor, CPU
• CPC Class Codes: H04Q 2213/1315 : Call waiting
• CPC Class Codes: H04Q 2213/13152 : Callback
• CPC Class Codes: H04Q 2213/1316 : Service observation, testing
• CPC Class Codes: H04Q 2213/13162 : Fault indication and localisation
• CPC Class Codes: H04Q 2213/13173 : Busy signals
• CPC Class Codes: H04Q 2213/13174 : Data transmission, file transfer
• CPC Class Codes: H04Q 2213/13175 : Graphical user interface [GUI], WWW interface, visual indication
• CPC Class Codes: H04Q 2213/1318 : Ringing
• CPC Class Codes: H04Q 2213/13196 : Connection circuit/link/trunk/junction, bridge, router, gateway
• CPC Class Codes: H04Q 2213/13199 : Modem, modulation
• CPC Class Codes: H04Q 2213/13201 : Change-over of service during connection
• CPC Class Codes: H04Q 2213/13203 : Exchange termination [ET]
• CPC Class Codes: H04Q 2213/13204 : Protocols
• CPC Class Codes: H04Q 2213/13209 : ISDN
• CPC Class Codes: H04Q 2213/13213 : Counting, timing circuits
• CPC Class Codes: H04Q 2213/13216 : Code signals, frame structure
• CPC Class Codes: H04Q 2213/1322 : PBX
• CPC Class Codes: H04Q 2213/13242 : Broadcast, diffusion, multicast, point-to-multipoint (1 : N)
• CPC Class Codes: H04Q 2213/13251 : Restricted service, class of service
• CPC Class Codes: H04Q 2213/1326 : Consultation call, broker's call, call hold, toggling
• CPC Class Codes: H04Q 2213/13282 : Call forward, follow-me, call diversion
• CPC Class Codes: H04Q 2213/13292 : Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13299 : Bus
• CPC Class Codes: H04Q 2213/13302 : Magnetic elements
• CPC Class Codes: H04Q 2213/13305 : Transistors, semiconductors in general
• CPC Class Codes: H04Q 2213/1332 : Logic circuits
• CPC Class Codes: H04Q 2213/13322 : Integrated circuits
• CPC Class Codes: H04Q 2213/13334 : Key telephone systems
• CPC Class Codes: H04Q 2213/1334 : Configuration within the switch
• CPC Class Codes: H04Q 2213/13362 : Asynchronous systems
• CPC Class Codes: H04Q 2213/13377 : Recorded announcement
• CPC Class Codes: H04Q 2213/13392 : Channels assigned according to rules
• CPC Class Codes: H04Q 2213/13405 : Dual frequency signaling, DTMF
• CPC Class Codes: H04Q 3/545 : using a stored programme
• CPC Class Codes: H04Q 3/58 : Arrangements providing connection between main exchange and sub-exchange or satellite
• CPC Class Codes: H04Q 3/625 : Arrangements in the private branch exchange

Abstract

According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12. A control unit (RCTU) 16 determines the called extension terminal on the basis of the detected caller ID and the information stored in the storage means, so the extension terminal receives the call from the digital key telephone interface unit (RDKU) 13 or a standard telephone interface unit (RSTU) 15.

Claims

1. A digital key telephone system having a main unit connected to a communication network through an office line and accommodating a plurality of extension lines connected to extension terminals, and having a function of switching and connecting the office line to at least one of the plurality of extension lines and/or the extension lines to each other, comprising:

camp-on control means for, when a new call arrives at an extension line which is communicating, holding said new call;

line determination means for determining whether said new call is on the office line or one of the plurality of extension lines; and

selective generation means for, during a period in which the new call is held by said camp-on control means, causing the called extension line to selectively generate a first camp-on tone indicating that the new call is on the office line or a second camp-on tone indicating that the new call is on one of the plurality of extension lines in accordance with a result of the determination made by said line determination means.

2. A digital key telephone system having a main unit connected to a communication network through an office line and accommodating a plurality of extension lines connected to extension terminals, and having a function of switching and connecting the office line to at least one of the plurality of extension lines and/or the extension lines to each other, comprising:

camp-on control means for, when a new call arrives at an extension line which is communicating, holding said new call;

first determination means for determining whether said new call is on the office line or one of the plurality of extension lines;

second determination means for determining whether a called extension terminal is a digital telephone or a standard telephone;

first control means for, when the second determination means determines that the called extension terminal is the standard telephone and the first determination means determines that the new call is on the office line, sending the first camp-on tone indicating that the new call is on the office line from the main unit to the called extension terminal in order to cause the extension terminal to output the first camp-on tone from a speaker of the called extension terminal;

second control means for, when the second determination means determines that the called extension terminal is the standard telephone and the first determination means determines that the new call is on one of the plurality of the extension lines, sending the second camp-on tone indicating that the new call is on one of the plurality of extension lines from the main unit to the called extension line in order to cause the extension terminal to output the second camp-on tone from the speaker of the called extension terminal;

third control means, for when the second determination means determines that the called extension terminal is the digital telephone and the first determination means determines that the new call is on the office line, sending a first command from the main unit to the called extension terminal in order to cause the extension terminal to generate the first camp-on tone on the basis of the first command and output the first camp-on tone from the speaker of the called extension terminal; and

fourth control means for, when the second determination means that the called extension terminal is the digital telephone and the first determination means determine that the new call is on one of the plurality of extension lines, sending a second command from the main unit to the called extension terminal in order to cause the extension terminal to generate the second camp-on tone at the called extension terminal on the basis of the second command and output the second camp-on tone from the speaker of the called extension terminal.

3. A digital key telephone system having a main unit connected to a communication network through an office line and accommodating a plurality of extension lines connected to extension terminals, and having a function of switching and connecting the office line to at least one of the plurality of extension lines and/or the extension lines to each other, configured to:

when a new call arrives at an extension line which is communicating, holding said new call;

determining whether said new call is on the office line or one of the plurality of extension lines; and

during a period in which the new call is held, causing the called extension line to selectively generate a first camp-on tone indicating that the new call is on the office line or a second camp-on tone indicating that the new call is on one of the plurality of extension lines in accordance with whether the caller of said new call is determined to be the office line or one of the plurality of extension lines.

4. A digital key telephone system having a main unit connected to a communication network through an office line and accommodating a plurality of extension lines connected to extension terminals, and having a function of switching and connecting the office line to at least one of the plurality of extension lines and/or the extension lines to each other, configured to:

when a new call arrives at an extension line which is communicating, holding said new call;

determining whether said new call is on the office line or one of the plurality of extension lines;

determining whether a called extension terminal is a digitial telephone or a standard telephone;

when it is determined that the called extension terminal is the standard telephone and that the new call is on the office line, sending the first camp-on tone indicating that the new call is on the office line from the main unit to the called extension terminal in order to cause the extension terminal to output the first camp-on tone from a speaker of the called extension terminal;

when it is determined that the called extension terminal is the standard telephone and that the new call is on one of the plurality of extension lines, sending the second camp-on tone indicating that the new call is on one of the plurality of extension lines from the main unit to the called extension line in order to cause the extension terminal to output the second camp-on tone from the speaker of the called extension terminal;

when it is determined that the called extension terminal is the digital telephone and that the new call is on the office line, sending a first command from the main unit to the called extension terminal in order to cause the extension terminal to generate the first camp-on tone on the basis of the first command and output the first camp-on tone from the speaker of the called extension terminal; and

when it is determined that the called extension terminal is the digital telephone and that the new call is on one of the plurality of extension lines, sending a second command from the main unit to the called extension terminal in order to cause the extension terminal to generate the second camp-on tone at the called extension terminal on the basis of the second command and output the second camp-on tone from the speaker of the called extension terminal.