JP2723222B2 - Communication terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a communication terminal device which, when receiving a subaddress from a main station such as an exchange, emits a ringing tone corresponding to the subaddress. . (Prior Art) Generally, in an environment such as an office or the like, one telephone is often shared by several people, so that inconvenience may be felt. For example, when a call comes in, it is not known who the call came to, so it is necessary for someone to pick up the phone, answer the other party, and then take over the call. This not only hinders the work of the successor, but is also annoying to the caller. Such inconveniences can be solved by installing a single telephone, but it is economically disadvantageous and impractical since there is little need for everyone to make a telephone call at the same time. (Problems to be Solved by the Invention) As described above, in the related art, when one telephone is shared by several people at the time of receiving a telephone call, there is an inconvenience that it is not possible to identify who called the telephone. . The present invention has been made in view of such a situation.
It is an object of the present invention to provide a communication terminal device which can identify a person who took a call when receiving a call even when several terminals are shared by several persons, and which does not require the trouble of handover. [Composition of the Invention] (Means for solving the problems) By the way, CCITT (International Telegraph and Telephone Technical Advisory Committee)
In ISDN (Integrated Services Digital Network), which is being considered for international standardization, it is planned to provide unprecedented rich communication services by integrating conventional telephone networks, data communication networks, facsimile networks, etc. . In the ISDN basic interface based on CCITT recommendation I.430, etc., by multiplexing and transmitting two information (B) channels and one common signal (D) channel (for transmission / reception control), a maximum of 8 channels can be transmitted on the same transmission path. By connecting a variety of communication terminals up to one to a bus, it is possible to simultaneously communicate with a plurality of terminals. In such a bus-type communication system, a plurality of terminals connected to a transmission line having the same subscriber number are respectively assigned subaddresses, and a caller inputs a destination subscriber number (called number) and a called subaddress at the time of calling. It is considered that the user can specify a specific terminal on the destination bus. In the present invention, in order to achieve the above-described object, a communication terminal device used in a system that performs communication using a control channel for controlling outgoing / incoming and an information channel for transmitting information includes a plurality of communication terminals. Storage means for storing a sub-address; ringing means for issuing different ring tones corresponding to each of the plurality of sub-addresses; and an incoming call signal including the sub-address including the sub-address from the system via the control channel. The sub-address in the storage unit is compared with the sub-address stored in the storage unit, and if a sub-address corresponding to the sub-address of the incoming call signal is present in the storage unit, the ringing unit is driven to emit a ringing tone corresponding to the sub-address. Means are provided. (Operation) For example, when one telephone is shared by several persons, different sub-addresses are assigned to each individual, and these sub-addresses are set and stored in the digital telephone according to the present invention, so that one telephone has a plurality of extensions. When a caller enters a sub-address when making a call, the sub-address is identified and a ringing tone corresponding to the sub-address is sounded when a call is received. In this way, on the receiving side, if each person sharing this digital telephone memorizes his / her own ringing tone, it is easy to identify to whom the call is directed. This eliminates the need for someone to take over the telephone as in the prior art, and achieves efficient communication. (Example) Hereinafter, an example of the present invention is described with reference to drawings. FIG. 1 shows a configuration diagram of a communication system to which a digital telephone according to the present invention is applied. In FIG. 1, an ISDN exchange 10 performs exchange and connection processing between communication terminals in a subscriber's home connected to a subscriber line 20. A large number of subscribers are connected to the subscriber line 20, and FIG. 1 shows the home system 30 of one of the subscribers. A two-wire four-wire interface conversion is performed by the network terminator 31 on the home system 30, and a plurality of digital telephones to which the present invention is applied are connected to a four-wire transmission line 32 in the subscriber home. On this transmission line 32, information channels B1 and B2 of 64 kbps and a signal channel D of 16 kbps are multiplexed and transmitted. In the subscriber line 20, the two information channels B1 and B2 and the signal channel D are transmitted by the ping-pong transmission or the echo canceller system in a two-wire system with the same capacity.
Perform between 30. The digital telephones 33a, 33b, and 33c connected to the transmission line 32 of the home system 30 have a function of setting, storing, and ringing different ringing tones corresponding to the called subaddress when a plurality of subaddresses are set. This is realized by the configuration shown in FIG. In FIG. 2, CPU 1 is a ROM (read only memory) 2
In accordance with the control program stored in the digital telephone, outgoing / incoming call control and sub address setting of the digital telephone are performed. A RAM (random access memory) 3 is used for temporarily storing data and sub addresses during execution of the CPU 1. The keypad 4 is composed of dial keys, function keys, and the like, and is used for key operations for making and receiving calls, inputting when setting a sub-address, and the like. Ringer 5 has a frequency of 500Hz and 600Hz at 10Hz
This is a ring tone oscillator that obtains an output modulated by, and drives a speaker (SP) to generate a ring tone. This linger 5 is CPU1
Controls the oscillation on / off. That is, the third
As shown in FIGS. 7A to 7E, the CPU 1 has five types of oscillation on / off patterns. FIG. 3A shows the repetition of ON for 1 second and OFF for 2 seconds. In this case, the ringing tone is the ringing tone when the subaddress is not included in the incoming call signal. FIG. 3 (b) shows the on-state for 0.5 second and 2.5
In this case, the ringing tone is a ringing tone when the subaddress is "07". Similarly, FIGS. 3 (c), (d), and (e) show ringing tones for sub-addresses "01", "03", and "09", respectively. The I interface 6 is connected to a partner terminal by the exchange 10 via a 4-wire in-home transmission line and an NT 31 based on CCITT Recommendation I.430. The I interface 6 multiplexes and separates two information (B) channels of 64 kbps and a control channel (D). Of these, the B channel is 64 kbps serial and is connected to a digital / analog PCM codec 8 for performing analog-to-digital conversion of voice.
The input and output of the voice are performed between and. On the other hand, the D channel is connected to the CPU 1 via a bus, and the CPU 1 inputs and outputs control signals for sending and receiving calls. Next, the operation will be described. First, a method of setting a sub-address in the digital telephone is by pressing a specific function key on the keypad 4 and then pressing a key of a sub-address to be set. At this time, when detecting that the function key for setting the sub-address has been input, the CPU 1 inputs the sub-address to be subsequently input to the RAM 3. This series of operations is the same when a plurality of subaddresses are set. For example, to set "07" as the sub address, press the function key "F1" on the keypad 4, press the dial keys "0" and "7", and then press the function key "#". The function key "#" indicates the end of the setting of the sub address. To set sub address “08”, press function key “F
Press "2", dial keys "0", "8" and function key "#". Similarly, to set sub-address "09", press function key "F3", dial keys "0", "9", By pressing the function key "#" By the above operation, three kinds of sub-addresses "07", "08" and "09" are stored in the RAM 3. This digital telephone is connected to the communication system shown in FIG. The operation sequence when the call is applied is shown in Fig. 4. In Fig. 4, when a caller originates a telephone call, he picks up the handset 7 (off-hook) and inputs the called number (other party number) as in the prior art. , The destination subaddress "07" is input, a call setting (calling) signal is generated in the CPU 1 and transmitted to the exchange 10 via the control channel (D) of the I-interface 6. This call setting signal is transmitted. Function (voice), called number, called sub address When receiving the call setting signal, the exchange 10 checks the element of the call setting signal and starts a connection process to the called side.The exchange 10 controls the transmission path corresponding to the called number. A call setup signal (call request) is also transmitted to the signal channel, and if the digital telephones 33a, 33b, and 33c shown in FIG. , 3
This call setup signal is received on the control channel (D) of the I interface 6 of 3b, 33c, and the CPU 1 compares the destination subaddress of the element of this call setup signal with the destination subaddress stored in itself and determines whether they match. Identify. At this time, "01", "02", "0
3 "," 04 "," 05 "," 06 "for the digital telephone 33b and" 07 "," 08 "," 09 "for the digital telephone 33c. A match is confirmed on the telephones.
The digital telephone 33c that ignores the call setting signal (no response) but matches the destination subaddress sends a response signal to the exchange 10 via the control channel. At this time, a ringing tone corresponding to the arrival sub address "07" is started to sound. In this case, since the ringing tone starts to sound in the pattern of FIG. 3 (b), it can be easily identified that the incoming call is for the person who has set the destination subaddress "07". When the called party picks up the handset 7 (off-hook) in response to the ringing tone, the CPU 1 sends a response signal to the exchange 10, and when the response confirmation signal is returned from the exchange 10, the telephone 1 enters a communication state using the B channel. As described above, in this embodiment, different ring tones are emitted for each destination sub-address, so that a single telephone call to a plurality of persons can be identified. In the above embodiment, the case of the digital telephone based on the I series recommendation has been described, but the present invention is not limited to this. The present invention is not limited to a digital telephone, but can be applied to a case where a ringing tone is generated in a facsimile, a data terminal, or a combined terminal of these and a digital telephone. [Effects of the Invention] As described in detail above, according to the present invention, even when a single terminal is shared, it is possible to identify who is calling when an incoming call is received. It becomes unnecessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a communication system according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a digital telephone applied to the communication system, and FIG. FIG. 4 shows an outgoing / incoming operation sequence. 1 CPU 2 ROM 3 RAM 4 Keypad 5 Ringer

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takayo Iwamoto               1 Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi Toshiba Corporation               Within the Research Institute                (56) References JP-A-59-91766 (JP, A)                 JP-A-60-165154 (JP, A)                 62-42352 (JP, U)                 "Report on Research and Practical Use (Vol. 34 No. 5)"                 Nippon Telegraph and Telephone Corporation R & D Division               Sho. 60.5.22 issued 725-726

Claims (1)

(57) [Claims] A communication terminal device used in a system for performing communication using a control channel for controlling outgoing / incoming calls and an information channel for transmitting information, a storage device for storing a plurality of sub-addresses, Ringing means for issuing different ring tones corresponding to each of the sub-addresses; and when an incoming call signal including the sub-address is received from the system via the control channel, the sub-address in the incoming call signal is stored in the storage means. Control means for driving the ringing means to generate a ringing sound corresponding to the subaddress if the subaddress included in the incoming call signal is found in the storage means. Characteristic communication terminal device.