JP2004266441A - Telephone set housing device and telephone set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly identify the type of a telephone set housed by a telephone set housing device. <P>SOLUTION: This telephone set housing device houses one type of a telephone set among a plurality of types with different effective bands at the time of communication and has a telephone type identifying means for automatically identifying the type of the housed telephone set at any timing of a call sequence. The telephone set type identifying means identifies the type of the housed telephone set by detecting on the basis of which band component a signal from the housed telephone set includes, how the housed telephone set intermittently transmits a prescribed frequency signal or what a telephone set characteristic of the housed telephone set side is like. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a telephone accommodation device and a telephone, and can be applied to, for example, a telephone communication system in which a telephone accommodation device selects an IP network or a public telephone network (PSTN) and executes communication of the accommodated telephone. is there.
[0002]
[Prior art]
The traditional public telephone network (PSTN) focuses on how to relay voice signals and communicates in a band of 3.4 kHz or less. Therefore, the terminal (general telephone) also treats a signal in a band of 3.4 kHz or more as an unnecessary signal, similarly to the network side.
[0003]
On the other hand, with the rapid expansion of broadband in recent years, not only transmission equipment on the network side has become compatible with broadband, but also subscriber lines are being expanded to broadband lines by ADSL, optical, etc., and end-to-end. Broadband voice communication is now possible. As a result, broadband telephones that can support high-quality voice communication have been proposed.
[0004]
By the way, as VOIP-compatible gateway devices that have become widespread in recent years, there are those that can accommodate a general telephone and a broadband telephone for a public telephone network, and a plurality of telephones (any of a general telephone and a broadband telephone may be used). ) Can be accommodated. In such a gateway device, it is determined whether to use an IP network or a public telephone network according to the type of telephone housed (or the type of a destination telephone), and a process corresponding to the determined network is performed. I do.
[0005]
For example, if the housed general telephone is connected to an IP network, the frequency characteristic of the transmission signal from the general telephone is corrected, and a high-quality transmission signal is transmitted to the IP network. On the other hand, if the accommodated broadband telephone is connected to an IP network, a broadband telephone call signal is supplied from the broadband telephone, so that the above-described function of correcting the frequency characteristic of the transmission signal is unnecessary. However, if the correction is performed, the quality is rather deteriorated.
[0006]
Therefore, the gateway device needs to have a function of identifying the type of the accommodated telephone.
[0007]
[Problems to be solved by the invention]
As a method of identifying the telephone type, a method of inputting and setting the telephone type to the gateway device by using a key of the telephone or the gateway device as an input key can be considered. However, in this method, the operation procedure is complicated because the setting is performed with a few keys, and the operability is poor for a user who is not a serviceman to perform the setting, and the setting may not be properly performed.
[0008]
Further, as a method of identifying the telephone type, a dip switch for setting the telephone type is provided in the gateway device, or the connector for connecting the telephone in the gateway device is a separate connector for the general telephone and the broadband telephone. A method is also conceivable. However, it is not possible to avoid the danger of setting a dip switch incorrectly or connecting connectors incorrectly.
[0009]
Therefore, there is a demand for a telephone accommodating device capable of accurately identifying the type of telephone contained therein, and a telephone capable of allowing the telephone accommodating device to accurately identify its own type.
[0010]
[Means for Solving the Problems]
The telephone accommodation apparatus according to the first aspect of the invention accommodates any one of a plurality of types of telephones having different effective bands at the time of communication, and changes the type of the accommodation telephone at any timing of a call sequence. It is characterized by having telephone type identification means for automatic identification.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the telephone type identification section includes a band dividing section for dividing a band of a signal from the accommodated telephone into a plurality of bands. Band-based signal presence / absence detecting means for detecting whether a valid signal component exists in the received band, and telephone type determination for determining the type of the accommodated telephone based on the detection result of the band-specific signal presence / absence detecting means And a part.
[0012]
According to a third aspect of the present invention, in the first aspect of the present invention, the telephone type identification unit detects an intermittent pattern of an intermittently arriving predetermined frequency signal, and detects an intermittent pattern. A telephone type determining unit that determines the type of the accommodated telephone based on the presence / absence, the content of the intermittent pattern, and / or a predetermined frequency related to the intermittent pattern.
[0013]
According to a fourth aspect of the present invention, there is provided a telephone set comprising: an intermittent pattern output means for outputting an intermittent pattern signal; a predetermined frequency signal output means for outputting a predetermined frequency signal intermittently in accordance with the output intermittent pattern signal; Superimposing means for superimposing a frequency signal on a transmission signal path, wherein the intermittent pattern output means, the predetermined frequency signal output means and the superimposing means function in a predetermined call sequence stage.
[0014]
According to a fifth aspect of the present invention, in the first aspect of the present invention, the telephone type identification means may include an impedance of the accommodated telephone, a voltage between two lines with the accommodated telephone, or a voltage of the accommodated telephone. A telephone characteristic measuring unit for measuring a blocking current, and a telephone type determining unit for determining the type of the accommodated telephone based on the measurement result of the telephone characteristic measuring unit.
[0015]
The telephone according to the sixth aspect of the present invention operates the impedance of the telephone, the voltage between two lines with the telephone accommodation, or the closing current of the telephone, as viewed from the telephone housing device housing the telephone. And a characteristic operation means that functions in the call sequence stage.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
(A) First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The first embodiment is characterized by a telephone accommodation device.
[0017]
FIG. 1 is a block diagram showing a detailed configuration of a telephone type identification circuit 10 in a telephone accommodation device (for example, a gateway device described in the section of the related art) 1 of the first embodiment.
[0018]
The telephone type identification circuit 10 includes a general telephone having a bandwidth of 3.4 kHz or less, a first broadband telephone having a bandwidth of 7.0 kHz or less (hereinafter, simply referred to as a broadband telephone), and a second broadband telephone having a bandwidth of 20 kHz or less ( (Hereinafter referred to as an audio band telephone).
[0019]
The telephone type identification circuit 10 includes band division filters 11-1 to 11-3, power calculation units 12-1 to 12-3, signal presence / absence detection units 13-1 to 13-3, and telephone type determination unit 14. These components may be realized by an analog circuit, or may be realized by a digital circuit.
[0020]
The three band division filters 11-1 to 11-3 separate the band of the signal from the telephone 2. As shown in FIG. 2A, the first band division filter (LPF) 11-1 passes a signal component of 3.4 kHz or less, and the second band division filter (BPF) 11-2. 2 passes signal components of 3.4 to 7.0 kHz as shown in FIG. 2B, and a third band division filter (HPF) 11-3 is shown in FIG. 2C. Thus, the signal component of 7.0 kHz or more is passed.
[0021]
Each of the power calculators 12-1 to 12-3 calculates the power of each of the divided bands. The power calculation units 12-1 to 12-3 calculate power, for example, every 10 ms.
[0022]
The signal presence / absence detectors 13-1 to 13-3 detect whether or not a signal from the telephone 2 includes a component of a separation band. The signal presence / absence detectors 13-1 to 13-3 respectively smooth the output power from the corresponding power calculators 12-1 to 12-3, and then compare the output power with a threshold value. , Outputs a logic “1” indicating the presence of a signal component in the band, and outputs a logic “0” indicating the absence of a signal component in the band when the smoothing power is equal to or less than the threshold.
[0023]
The telephone type determination unit 14 determines the type of the telephone 2 accommodated based on the detection results X to Z of the signal presence / absence for each band by the signal presence / absence detection units 13-1 to 13-3. The telephone type determination unit 14 makes a determination according to the truth table shown in FIG. 3, and outputs the obtained telephone type information.
[0024]
Note that the telephone type information from the telephone type determination unit 14 is given to a processing circuit of each unit that changes processing according to the type of telephone in the telephone housing device 1.
[0025]
If the telephone set 2 accommodated by the telephone accommodation apparatus 1 is a general telephone set, the band is 3.4 kHz or less, so that the signal presence / absence detection results X by the signal presence / absence detectors 13-1 to 13-3 X ＺZ becomes “100”, and as a result, the telephone type determination unit 14 determines that the accommodated telephone 2 is a general telephone.
[0026]
When the telephone set 2 accommodated by the telephone accommodation apparatus 1 is a broadband telephone set, the band is equal to or lower than 7.0 kHz, so that the signal presence / absence detection units 13-1 to 13-3 detect the presence / absence of a signal for each band. The results X to Z become “110”, and as a result, the telephone type determination unit 14 determines that the accommodated telephone 2 is a broadband telephone.
[0027]
Further, when the telephone 2 accommodated in the telephone accommodating apparatus 1 is an audio band telephone, since the band is 20 kHz or less, the detection result of the signal presence / absence for each band by the signal presence / absence detection units 13-1 to 13-3. X to Z become “111”, and as a result, the telephone type determination unit 14 determines that the accommodated telephone 2 is an audio band telephone. Note that when the detection result X-Z of the signal presence / absence for each band by the signal presence / absence detection units 13-1 to 13-3 becomes "101", since the highest band component is included, the accommodated telephone 2 is set to the audio band. It is determined (estimated) that it is a telephone.
[0028]
Here, the detection result X-Z of the signal presence / absence for each band by the signal presence / absence detection units 13-1 to 13-3 cannot be "000", "001", "010", or "011". However, in such a case, the accommodated telephone 2 is determined (estimated) as a general telephone so that a minimum telephone call can be guaranteed.
[0029]
Note that the signal from the telephone 2 used for the type determination as described above is not limited to a transmission signal, and may be a signal in a call sequence stage before a call is made. (Including background noise). Even if it is noise, it can be determined if it is affected by the band limitation of the telephone.
[0030]
According to the first embodiment, since the determination is made based on the difference in the effective bandwidth depending on the type of the telephone, the type of the accommodated telephone can be accurately identified. Erroneous setting by the user cannot occur.
[0031]
(B) Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. The second embodiment is characterized by a telephone accommodation device and a telephone.
[0032]
FIG. 4 is a block diagram showing a detailed configuration of the telephone type identification circuit 20 in the telephone accommodation device 1A according to the second embodiment.
[0033]
The telephone type identification circuit 20 of the second embodiment also identifies which of a general telephone, a broadband telephone and an audio telephone is accommodated.
[0034]
The telephone type identification circuit 20 includes two filters 21-1 and 21-2, pulsating circuits 22-1 and 22-2, pattern determination units 23-1 and 23-2, and a telephone type determination unit 24.
[0035]
The first filter (BPF) 21-1 passes only the first specific frequency component (for example, 6 kHz), and the second filter 21-2 (BPF) passes the second specific frequency component (BPF). For example, only 12 kHz) is passed.
[0036]
In the case of the second embodiment, as shown in FIG. 6A, the broadband telephone transmits the first specific frequency signal (for example, 6 kHz) for 200 ms, and stops transmitting for 200 ms. The transmission stop is repeated a predetermined number of times. As shown in FIG. 6 (B), the audio band telephone transmits the second specific frequency signal (for example, 12 kHz) for 200 ms, and stops transmitting for 200 ms. Transmission and transmission stop are repeated a predetermined number of times.
[0037]
The pulsing circuits 22-1 and 22-2 convert output signals from the corresponding filters 21-1 and 21-2 into pulse signals, respectively. The pulsing circuits 22-1 and 22-2, for example, obtain an envelope of the input signal and compare it with a threshold level to convert it into a pulse signal.
[0038]
The pattern determination units 23-1 and 23-2 determine whether or not the output signals of the corresponding pulsating circuits 22-1 and 22-2 have a predetermined pattern as shown in FIG. It is. Each of the pattern determination units 23-1 and 23-2 outputs a logic "1" when the pattern is a predetermined pattern, and outputs a logic "1" when the pattern is not a predetermined pattern.
[0039]
The telephone type determining unit 24 determines the type of the telephone 2 accommodated based on the determination results by the pattern determining units 23-1 and 23-2. At the determination timing (when it is recognized that the accommodated telephone 2 has gone off-hook), the telephone type determination unit 24 determines that the accommodated telephone 2 is “00” when the output combination of the two pattern determination units 23-1 and 23-2 is “00”. When the combination is determined to be a general telephone and the output combination of the two pattern determination units 23-1 and 23-2 is "10", the accommodation telephone 2 is determined to be a broadband telephone, and the output of the two pattern determination units 23-1 and 23-2 is determined. When the combination is “01”, it is determined that the accommodated telephone 2 is an audio band telephone.
[0040]
FIG. 5 shows a main configuration of a broadband telephone or an audio band telephone according to the second embodiment.
[0041]
In FIG. 5, a broadband telephone or an audio band telephone (represented by reference numeral 2A) includes an oscillation control unit 30, a specific frequency oscillator 31, and a superimposer 32.
[0042]
When an off-hook detection signal is supplied from an off-hook detection sensor (not shown), the oscillation control unit 30 provides an oscillation control signal as shown in FIG.
[0043]
The specific frequency oscillator 31 oscillates and outputs a specific frequency during the period of logic "1" of the oscillation control signal from the oscillation control unit 30, and stops the output during the period of logic "0" of the oscillation control signal. The specific frequency oscillator 31 of the broadband telephone oscillates at a first specific frequency (for example, 6 kHz), and the specific frequency oscillator 31 of the audio band telephone oscillates at a second specific frequency (for example, 12 kHz).
[0044]
The superimposer 32 superimposes an oscillation output from the specific frequency oscillator 31 on a path to the accommodated telephone housing device.
[0045]
When the telephone 2 accommodated in the telephone accommodation device 1A is a general telephone, even if the telephone 2 is off-hook, intermittent burst oscillation at the first frequency and the second frequency is not performed. The outputs of the pattern determination units 23-1 and 23-2 of the accommodation device 1A are "00", and the telephone type determination unit 24 determines that the accommodation telephone 2 is a general telephone.
[0046]
When the telephone 2 accommodated in the telephone accommodating apparatus 1A is a broadband telephone, when the telephone 2 is off-hook, intermittent burst oscillation at the first frequency is performed. As a result, the telephone accommodating apparatus 1A The output of the pattern determination units 23-1 and 23-2 is "10", and the telephone type determination unit 24 determines that the accommodated telephone 2 is a broadband telephone.
[0047]
Further, when the telephone 2 accommodated in the telephone accommodating apparatus 1A is an audio band telephone, when the telephone 2 is off-hook, intermittent burst oscillation at the second frequency is performed. The outputs of the 1A pattern determination units 23-1 and 23-2 are "01", and the telephone type determination unit 24 determines that the accommodated telephone 2 is an audio band telephone.
[0048]
According to the second embodiment, the specific type of telephone is caused to perform intermittent burst oscillation at a predetermined frequency, and the type of the accommodated telephone is determined based on whether or not the intermittent burst oscillation is received. Therefore, the type of the accommodated telephone can be accurately identified, and since the automatic determination is made, erroneous setting by the user and the like cannot occur.
[0049]
Further, according to the second embodiment, since the predetermined frequency is determined in relation to the effective band of the telephone, it is possible to accurately identify the type of the accommodated telephone from this point as well.
[0050]
FIG. 7 is a timing chart of each part for describing a modified embodiment of the second embodiment.
[0051]
In this modified embodiment, as shown in FIG. 7A, the broadband telephone transmits a specific frequency signal (for example, 6 kHz) for 200 ms, stops transmission for 200 ms, and repeats the transmission and transmission stop for a predetermined number of times. On the other hand, as shown in FIG. 7C, the audio band telephone transmits the same specific frequency signal as described above for 300 ms, stops transmission for 100 ms, and repeats the transmission and the transmission stop for a predetermined number of times. It is a repetition.
[0052]
Therefore, when these are converted into pulse signals, a combination of different periods of logic "1" and "0" shown in FIGS. 7B and 7D is obtained, respectively. Can be discriminated. The case where the pulse signals shown in FIGS. 7B and 7D cannot be obtained is the case where the accommodated telephone 2 is a general telephone.
[0053]
(C) Third Embodiment Next, a third embodiment of the present invention will be described with reference to the drawings. The third embodiment is characterized by a telephone accommodation device and a telephone, or a telephone accommodation device.
[0054]
FIG. 8 is a block diagram showing a detailed configuration of the telephone type identification circuit 40 in the telephone accommodation device 1B of the third embodiment.
[0055]
The telephone type identification circuit 40 according to the third embodiment also identifies which of a general telephone, a broadband telephone and an audio telephone is accommodated.
[0056]
The telephone type identification circuit 40 includes a voltmeter 41, an ammeter 42, an impedance calculation unit 43, and a telephone type determination unit 44.
[0057]
The voltmeter 41 measures the voltage between the two wires L1 and L2 connected to the accommodation telephone 2, and digitally outputs the obtained voltage value.
[0058]
The ammeter 42 measures a closing current when the accommodated telephone 2 blocks between the two lines L1 and L2, and digitally outputs the obtained current value.
[0059]
The impedance calculation unit 43 determines the impedance of the telephone 2 as viewed from the telephone housing 1B based on the measurement results of the voltmeter 41 and the ammeter 42.
[0060]
The telephone type determination unit 44 determines the type of the accommodated telephone 2 based on the impedance obtained by the impedance calculation unit 43. The telephone type determination unit 44 determines that the telephone is a general telephone when the impedance is around 600Ω, determines that it is a broadband telephone when the impedance is around 300Ω, and determines that it is an audio band telephone when the impedance is around 900Ω. The telephone type determination unit 44 performs the determination when the accommodated telephone 2 is off-hook, for example.
[0061]
Here, if the broadband telephone and the audio band telephone do not take such an impedance at the time of off-hook, the configuration as shown in FIG. 9A or FIG. (Represented by reference numeral 2B).
[0062]
In FIG. 9, the broadband telephone or the audio band telephone 2B includes a resistance element 50, a switch 51, and a switch control unit 52.
[0063]
In the case of a broadband telephone, as shown in FIG. 9A, the resistance element 50 and the switch 51 are connected in series between two lines L1 and L2 connected to the opposite telephone housing 1B. When the switch 51 is turned on, the resistance element 50 of the broadband telephone is selected to have a resistance value that makes the impedance of the telephone 2B side as viewed from the telephone housing apparatus 1B close to 300Ω.
[0064]
In the case of an audio band telephone, as shown in FIG. 9B, the resistance element 50 and the switch 51 are connected to one of two lines L1 and L2 connected to the opposite telephone housing device 1B (the line L1 is shown). Are connected so that the resistance element 50 can be inserted and controlled in series. The resistance element 50 of the audio band telephone is selected to have a resistance value such that when the switch 51 is turned on, the impedance of the telephone 2B side as viewed from the telephone housing apparatus 1B is close to 900Ω.
[0065]
The switch control unit 52 turns on the switch 51 for a predetermined period when an off-hook detection signal is supplied from an off-hook detection sensor (not shown).
[0066]
When the telephone 2 accommodated in the telephone accommodation apparatus 1A is a general telephone, even if the telephone 2 is off-hook, the impedance operation is not performed on the telephone 2, and as a result, the output of the impedance calculation unit 43 of the telephone accommodation apparatus 1A is output. Is near 600Ω, and the telephone type determination unit 44 determines that the accommodated telephone 2 is a general telephone.
[0067]
Further, when the telephone 2 accommodated in the telephone accommodation apparatus 1A is a broadband telephone, when the telephone 2 is off-hook, the switch 51 is turned on. As a result, the output of the impedance calculation unit 43 of the telephone accommodation apparatus 1A becomes It becomes near 300Ω, and the telephone type determination unit 44 determines that the accommodated telephone 2 is a broadband telephone.
[0068]
Further, when the telephone 2 accommodated in the telephone accommodating apparatus 1A is an audio band telephone, when the telephone 2 is off-hook, the switch 51 is turned on, and as a result, the output of the impedance calculator 43 of the telephone accommodating apparatus 1A is output. Is near 900Ω, and the telephone type determination unit 44 determines that the accommodated telephone 2 is an audio band telephone.
[0069]
Even if the configuration shown in FIG. 9 is not provided, the configuration shown in FIG. 9 can be omitted as long as the impedance is different among the general telephone, the broadband telephone, and the audio band telephone.
[0070]
According to the third embodiment, since the type of the accommodated telephone is determined based on the impedance viewed from the accommodated telephone side, the type of the accommodated telephone can be identified accurately, and the type of the accommodated telephone can be determined automatically. Erroneous settings by the user cannot occur.
[0071]
(D) Other Embodiments In each of the above embodiments, the number of types of accommodated telephones to be identified is three, but the number may be two or four or more.
[0072]
The second embodiment shows a case where the intermittent pattern is the same and the specific frequency is different for the broadband telephone and the audio band telephone. In the second embodiment, the intermittent pattern is the same for the broadband telephone and the audio band telephone and the specific frequency is the same. Are different, but these may be combined. That is, the intermittent pattern and the specific frequency may be different. Also, the intermittent transmission of the specific frequency signal may be executed from a general telephone. Note that the specific frequency that one telephone oscillates and outputs may be two or more, and is not limited to a stable sine wave signal, and may be a signal with some modulation.
[0073]
In the third embodiment, the impedance operation is performed on the broadband telephone and the audio band telephone. However, the general telephone may be operated on the impedance. Also, the accommodated telephone type may be identified based only on the two-line voltage instead of the impedance, or the accommodated telephone type may be identified based only on the blocking current.
[0074]
The identification timing of the accommodated telephone type is not limited to the off-hook timing as described above, and may be any timing. Further, the type of the accommodated telephone may be identified not only when the accommodated telephone is the calling side but also when the accommodated telephone is the called side. The off-hook timing is a timing that can be applied regardless of the calling side or the called side.
[0075]
The device to which the telephone accommodating device of the present invention is applied is not limited to the gateway device, and the present invention can be applied to various devices that need to identify the type of the accommodated telephone.
[0076]
【The invention's effect】
As described above, according to the present invention, it is possible to accurately identify the type of telephone accommodated in the telephone accommodation device.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a detailed configuration of a telephone type identification circuit in a telephone accommodation device of a first embodiment.
FIG. 2 is a frequency characteristic diagram showing pass bands of three band separation filters of the first embodiment.
FIG. 3 is an explanatory diagram of determination logic of a telephone type determination unit according to the first embodiment.
FIG. 4 is a block diagram showing a detailed configuration of a telephone type identification circuit in the telephone accommodation device of the second embodiment.
FIG. 5 is a block diagram illustrating a main configuration of a telephone according to a second embodiment.
FIG. 6 is a timing chart of each part of the second embodiment.
FIG. 7 is a timing chart of each part of a modified embodiment of the second embodiment.
FIG. 8 is a block diagram showing a detailed configuration of a telephone type identification circuit in the telephone accommodation device of the third embodiment.
FIG. 9 is a block diagram illustrating a main configuration of a telephone according to a third embodiment.
[Explanation of symbols]
1, 1A, 1B: telephone accommodating device, 2, 2A, 2B: telephone, 10, 20, 40 ... telephone type identification circuit, 11-1 to 11-3 ... band division filter, 12-1 to 12-3 ... power Calculators, 13-1 to 13-3: signal presence / absence detectors, 14, 24, 44 ... telephone type determination units, 21-1, 21-2 ... filters, 22-1, 22-2 ... pulsing circuits, 23 -1, 23-2: pattern determination unit, 30: oscillation control unit, 31: specific frequency oscillator, 32: superimposer, 41: voltmeter, 42: ammeter, 43: impedance calculation unit, 50: resistance element, 51 ... switch, 52 ... switch control unit.

Claims (6)

In a telephone accommodation device that accommodates any one of a plurality of types of telephones having different effective bands at the time of communication,
A telephone accommodation device comprising telephone type identification means for automatically identifying the type of accommodation telephone at any timing of a call sequence. The telephone type identification means,
The band of the signal from the accommodated telephone, a band separation unit that separates into a plurality of bands, and a band-specific signal presence / absence detection unit that detects whether a valid signal component exists in the divided band,
2. The telephone accommodating apparatus according to claim 1, further comprising: a telephone type determining unit that determines a type of the accommodated telephone based on a detection result of the band-specific signal presence / absence detecting unit. The telephone type identification means,
A pattern detection unit that detects an intermittent pattern of a predetermined frequency signal that intermittently arrives,
The telephone according to claim 1, further comprising: a telephone type determining unit that determines the type of the accommodated telephone based on whether or not the intermittent pattern is detected, the content of the intermittent pattern, and / or a predetermined frequency related to the intermittent pattern. Housing equipment. An intermittent pattern output unit that outputs an intermittent pattern signal, and a predetermined frequency signal output unit that outputs a predetermined frequency signal intermittently according to the output intermittent pattern signal;
Superimposing means for superimposing the predetermined frequency signal on the transmission signal path,
A telephone according to claim 1, wherein said intermittent pattern output means, said predetermined frequency signal output means, and said superposition means function in a predetermined call sequence stage. The telephone type identification means,
A telephone characteristic measuring unit for measuring the impedance of the accommodated telephone, a voltage between two lines with the accommodated telephone, or a closing current of the accommodated telephone;
The telephone accommodation device according to claim 1, further comprising: a telephone type determination unit that determines a type of the accommodated telephone based on a measurement result of the telephone characteristic measurement unit. A characteristic operating means functioning at a predetermined call sequence stage for operating the impedance of the telephone as viewed from the telephone accommodating device accommodating the self, the voltage between two lines with the telephone accommodating device, or the closing current of the telephone. A telephone comprising:

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