JP2002218067A - Message transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a message transmission system which can control to display a message lamp of a telephone set without specially adding and converting an existent telephone exchange, and can simply introduce a voice mail device. SOLUTION: A telephone exchange 1 is connected to a voice mail device 2 via a speech line (telephone line) 3, and the voice mail device 2 controls presence or absence of a speech message addressed to a plurality of telephone sets 5, and transmits, to the telephone exchanger 1, a message store display instruction for a message lamp 6 of the telephone set 5 by a speech signal (frequency signal).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a message transmission system for transmitting a voice message to a telephone having a message lamp for displaying the presence or absence of a message, and more particularly to a message transmission system suitable for transmitting a message to hotel guests. .

[0002]

2. Description of the Related Art In general, a hotel employs a message transmission system called an answering machine system. In recent years, a voice mail device has been introduced to accurately transmit message content of a message to such a message transmission system.

[0003] The voice mail device is a communication partner (a guest).
This is to record the voice message of the message messenger when is busy or absent. Voice messages are managed by a message storage device for each person to whom the message is to be delivered (guests), and when a voice message is registered, the message lamp of the corresponding telephone is turned on to indicate that there is a message, and the user is talking or returning from a destination. The incoming caller can know if there is a message.

When a voice message is registered, the message storage device transmits the registration of the voice message to a private branch exchange, and the private telephone exchange turns on a message lamp of a corresponding telephone.

[0005] In the message transmission method, when a talking or absent party notices that the message lamp is turned on and presses the message button, the party connects to the message storage device through the telephone line and reproduces the corresponding voice message.
When the voice message is played, the message lamp of the corresponding telephone is turned off.

When the voice message is played, the message storage device sends the fact that the voice message has been played back to the private branch exchange, and the private telephone exchange turns off the message lamp of the corresponding telephone.

[0007] Voice mail devices are disclosed in, for example, Japanese Patent Application Laid-Open Nos. Hei 6-334768 and Hei 11-21.
What is described in 9486 gazette is known.
In this prior art, when a message is stored, the message lamp of the corresponding telephone is turned on, and when the message is transmitted, the message is deleted and the message lamp of the corresponding telephone is turned off.

[0008]

When a voice mail device is newly introduced into an existing message transmission system such as an answering machine system of a hotel, a telephone exchange and a voice mail device are used especially for controlling display of a message lamp. Must be connected by a data line. To transmit and receive data between the existing telephone exchange and the voice mail device, a physical interface is added to the existing telephone exchange and a message information processing unit for exchanging message information between the existing telephone exchange and the voice mail device is added. Have to do it. For this reason, there is a problem that it is extremely troublesome to introduce a voice mail device into an existing telephone exchange.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the purpose of simplifying the voice mail apparatus which can control the display of the message lamp of the telephone without any special addition or modification to the existing telephone exchange. It is an object of the present invention to provide a message transmission system that can be introduced into a system.

[0010]

A feature of the present invention is that a voice mail device is connected to a telephone exchange via a voice line (telephone line), and the voice mail device transmits voice messages to a plurality of telephones. The presence / absence is managed, and a message presence display instruction for a message lamp of the telephone is transmitted to the telephone exchange as a voice signal (frequency signal).

According to the present invention, the voice mail apparatus manages the presence or absence of voice messages addressed to a plurality of telephones, and transmits a message presence display instruction to a message lamp of the telephone to the telephone exchange as a voice signal (frequency signal). Usually, an electronic exchange used in a hotel has a display control function of a message lamp when instructed by a special dial number by a voice signal (frequency signal). Therefore, the display of the message lamp of the telephone can be controlled without adding or modifying the existing telephone exchange by using the function of the electronic exchange as it is, and the voice mail device can be easily introduced.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, a telephone exchange 1 controls a private telephone line, and includes three relay stations 7a to 7c,
Telephones 5a to 5n and other telephones not shown, FA
X device etc. is connected by telephone line (voice line).
The voice mail device 2 is connected via a voice line 3. The telephone exchange 1 includes a line controller 10 and a message lamp controller 11. The telephones 5a to 5n are installed in hotel guest rooms and have message lamps 6a to 6n.

The voice mail apparatus 2 connected to the telephone exchange 1 via the voice line 3 has a signal analysis unit 20 for analyzing a frequency signal (voice signal) input from the voice line (telephone line) 3. The frequency signal (PB signal) is called a special dial number (special number), a push button dial signal, or a push button signal, and is a dial number combining two frequency signals of a low frequency and a high frequency. The operation control unit 21 determines the operation of the voice mail device 2 based on the content of the PB signal analyzed by the signal analysis unit 20.

The data converter 22 digitizes voice data (voice message) and converts the digital data into a voice signal. The message data digitized by the data conversion unit 22 is stored in the message information storage unit 23. The message lamp control command unit 24 instructs the message lamp control unit 11 of the telephone exchange 1 to turn on and off the message lamps 6a to 6n of the room telephones 5a to 5n, and instructs a message display instruction.

Next, the operation will be described.

A telephone call to the representative telephone number of the hotel is connected to the relay consoles 7a to 7c, and a telephone operator responds. If it is a telephone call to the guest, the guest room number of the guest is checked and the telephones 5a to 5n of the guest room are connected. If the guest is present, the guest answers the telephone.

On the other hand, when the guest is absent and there is no telephone answering or busy, the telephone operator confirms whether or not to put a voice message to the caller.
The telephone operator transfers the call to the voicemail device 2 when the caller wants to enter a voice message.

When the telephone is transferred to the voice mail device 2, the voice mail device 2 answers. The telephone operator operates the relay consoles 7a to 7c by keying and instructs the voice mail device 2 to record using a PB signal.

The PB signal is a frequency signal (voice signal) and is usually a dial number obtained by combining two frequency signals of a low frequency and a high frequency as shown in FIG. For example, the dial number “1” is configured by combining two frequency signals of 697 Hz and 1209 Hz.

The telephone operator operates the relay consoles 7a to 7c by key operation. First, a PB signal indicating a recording instruction, for example, "1" or "1", and then a PB signal indicating an extension number of the room telephone 5 to which a message is to be entered. Signal, room extension number 103
If it is 4, "1", "0", "3", and "4" are generated. This means that the key of the relay console 7 of the transfer source of the telephone or the push button of the business telephone (not shown) is set to "1""1".
It can be performed by pressing in the order of "1""0""3""4".

When the voice mail device 2 receives a PB signal (dial signal, dial number) via the telephone line 3, the PB signal analysis unit 20 analyzes the PB signal and gives a recording instruction at the first "1" or "1". Interpreted as the next "1""0"
Room extension number 10 to put "3" and "4" messages
Interpreted as 34. The operation control section 21 plays a sound “Recording to 1034” to the transfer console 7 to inform that the message recording is ready. Here, the transfer source operator gets out of the call. Thereby, recording of a message between the original caller and the voice mail device 2 starts.

The transfer to the voice mail device 2 is not performed by the telephone operator, but is performed when the room telephone is busy or when the 10
Calls can be automatically forwarded to voicemail if there is no answer.

The voice mail apparatus 2 records a voice message after playing a talkie guidance for recording a message. The voice message is recorded by the data converter 2.
This is performed by digitizing the voice in 2 and storing it in the message information storage unit 23. Recording of the message ends when the caller hangs up.

When the recording of the message is completed, the message information storage unit 23 stores that the message has entered the room, and the operation control unit 21 operates the message lamp control command unit 24.

FIG. 2 shows an example of the message lamp control command section 24.

In FIG. 3, the message lamp control command unit 24 includes an operation instruction unit 240, a dialing circuit 24,
1. It is composed of a PB signal generation circuit 242. The operation instructing unit 240 receives the message lamp lighting instruction and the information of the room extension number from the operation control unit 21. The lighting instruction of the message lamp 7 is represented by "1", and the room extension number is the same numerical value, that is, the room extension number is 1034.
If so, the numerical values "1", "0", "3", and "4" are received.

When the operation instructing section 240 receives the message lamp lighting instruction and the information of the room extension number, the operation instructing section 240 issues an off-hook instruction and a message lamp lighting special number, for example, a dial number of "21" to the dialing circuit 241. Dial and instruct. Here, the special number for turning on the message lamp to be dialed is the same as the special number for dialing from the business telephone, pick up the handset of the business telephone (off-hook), and use the push button to set “2” “1”
Is equivalent to pressing. FIG. 4 shows an arrangement of the contents of a special dial number (special number).

Next, operation instructing section 240 instructs PB signal generating circuit 242 to transmit the PB signals having the numerical value of the room extension number to voice line 3 one by one. If the room extension number is 1034, first, an instruction to send a PB signal of “1” is issued, then a PB signal of “0” is sent, then a PB signal of “3” is sent, and finally “4”. Of the PB signal is transmitted. The PB signal generation circuit 242 generates the designated PB signal and sends it to the voice line 3. Next, the operation instruction unit 240 instructs the dialing circuit 241 to go on-hook, and the dialing circuit 241 executes a line disconnection process.

With the above processing, the message extension control unit 11 of the telephone exchange 1 is notified of the extension number 1034
Is turned on, and the message lamp 6 of the telephone 5 of the extension number 1034 is turned on.

The dialing circuit 241 and the PB signal generation circuit 242 are known technologies, and the message lamp control command section 24 can be configured by using an analog line audio board or the like.

The reproduction of the voice message registered in the voice mail apparatus 2 is performed as follows.

When the guest returning from the outside notices that the message lamp 6 of the guest room telephone 5 is turned on, the guest presses a message reproduction button (not shown) of the telephone 5. On telephones without a message playback button, dial a speed dial for message playback. Thus, the dial stored in the telephone is dialed. The contents to be dialed include the extension number of the voice mail device 2 (or the representative number if there are a plurality of voice lines of the voice mail device 2), a pause of 2 seconds, and a number indicating a reproduction instruction to the voice mail device 2. For example, "40", and then the passenger extension number.

As an example, assuming that the extension number of the voice mail device 2 is 3900, if the telephone has a room extension number 1034, "3", "9", "0", "0", "pause of 2 seconds", and "4" Dial information "0", "1", "0", "3", and "4" is registered. Thus, when the message playback button of the guest room telephones 5a to 5n is pressed, or when a speed dial for message playback is performed, the dialing of "3", "9", "0", "0" and "2" are performed.
A “pause of seconds” is executed, and the voice mail device 2 is called via the telephone exchange 1.

Voice mail device 2 responds to a call from telephone exchange 1. The dialing of “4”, “0”, “1”, “0”, “3”, and “4” after the “pause for 2 seconds” of the room phone 5 leads to the voice mail device 2 via the voice line 3 "4""0""1""0""3"
The PB signal of “4” is captured.

In the voice mail device 2, the PB signal analyzer 20 recognizes "40" as a message reproduction and outputs "10".
34 "is recognized as the room extension number. As a result, the operation control unit 21 instructs to take out the message data of the guest room extension number 1034, and the message data of the extension number 1034 stored in the message information storage unit 23 is taken out.
The data is sent to the data converter 22.

The data converter 22 converts digital data into voice and sends it to the voice line 3. This sound flows to the room telephone 5 via the telephone exchange 1. When the reproduction of the voice message of the room extension number is completed, the voice mail device 2 disconnects the call. Thereafter, the operation control section 21 operates the message lamp control command section 24. The operation of the message lamp control command section 24 is the same as that of the message lamp ON, except that the message lamp ON instruction is changed to the light OFF instruction. Operation instruction section 2
40 receives the message lamp turn-off instruction and the information of the room extension number from the operation control unit 21. The message lamp lighting instruction is represented by “0”, and the room extension number receives the numerical value as it is, that is, if the room extension number is 1034, the numerical values “1”, “0”, “3”, and “4” are received.

Upon receiving the message lamp extinguish instruction and the information on the extension number of the cabin, the operation instructing unit 240 instructs the dialing circuit 241 to make an off-hook instruction and a special number for extinguishing the message lamp, for example, dialing "22". Instruct. Next, the operation instructing unit 240 issues an instruction to the PB signal generating circuit 242 to transmit the PB signal of the numerical value of the room extension number to the voice line 3 one by one.

If the room extension number is 1034, first,
Sending a PB signal of “1” is instructed, then sending a PB signal of “0”, sending a PB signal of “3”, and finally “4”
Of the PB signal is transmitted. PB signal generation circuit 242
Generates the designated PB signal and sends it to the voice line 3. Next, the operation instruction unit 240
1 is instructed to be on-hook, and the dialing circuit 241 executes line disconnection processing. By the above processing,
The message lamp control unit 11 of the telephone exchange 1 is instructed to turn off the message lamp of the telephone 5 of the extension number 1034, and the message lamp 6 of the telephone of the extension number 1034 is turned off.

As described above, only by connecting the telephone exchange 1 and the voice mail device 2 by the voice line 3, the message lamp 6 of the room telephone 5 is turned on and the voice message is released in conjunction with the registration of the voice message. The message lamp 6 of the room phone 5 can be turned off in conjunction with (reproducing all voice messages).

The display control of the message lamp of the room telephone is performed in this manner. The voice mail device manages the presence or absence of voice messages addressed to a plurality of telephones, and issues a voice message display instruction to the message lamp of the telephone. The signal (frequency signal) is transmitted to the telephone exchange. Usually, an electronic exchange used in a hotel has a display control function of a message lamp when instructed by a special dial number by a voice signal (frequency signal). Therefore, the display of the message lamp of the telephone can be controlled without adding or modifying the existing telephone exchange by using the function of the electronic exchange as it is, and the voice mail device can be easily introduced.

FIG. 5 shows another embodiment of the present invention.

FIG. 5 differs from FIG. 1 in that four voice modems 8 a to 8 d for converting a frequency signal into a digital signal or a digital signal into a frequency signal are provided outside the voice mail device 2.

Referring to FIG. 5, a message is registered by inputting voice signals from the telephone exchange 1 to four voice modems 8a to 8d via the voice line (telephone line) 3, and by the voice modems 8a to 8d. Digitized and compressed,
The voice message and the message information are taken into the voice mail device (message storage device) 2 as data. The message storage device 2 that has fetched the message sends a lighting instruction (digital signal) for the message lamps 6a to 6n of the telephones 5a to 5n to the voice modems 8a to 8n based on the message information, and sends them to the voice modems 8a to 8d. The PB signal is transmitted to the telephone exchange 1 via the telephone line 3. The message storage device 2 includes a message information reproducing unit 25.

The operation of turning on the message lamp at the time of voice message registration in the embodiment shown in FIG. 5 will be described with reference to the flowchart of FIG.

For telephone calls other than dial-in from outside the facility provided with the telephone exchange 1 to the inside of the facility, the telephone exchange operator receives calls at the three relay consoles 7a to 7c and designates the designated telephones 5a to 5n. Call. First, block S0
In step 1, the telephone line control unit 10 in the telephone exchange 1 calls the telephones 5a to 5n.
In step 2, it is confirmed whether or not there is a response to the call. If there is a response, the line is connected in block S08.

If there is no response in block S02, the voice modem 8 is transmitted from the telephone line control unit 10 of the private branch exchange 1 via the telephone line 3 in block S03.
a to 8d, and a PB signal of a message registration request is transmitted. The voice modems 8a to 8d that have received the message registration request digitize and compress the PB signal and send it to the message storage device 2.

The telephone line control unit 10 of the telephone exchange 1
After transmitting the signal, the telephone line 3 and the message storage device 2 are connected, and the message is stored as a voice message and message information in the message information storage unit 23 in the message storage device 2 in block S04. After registering the message information, block S
At 05, the message lamp control command section 24 in the message storage device 2 sends a message lamp lighting instruction to the voice modems 8a to 8d.

The voice modems 8a to 8d which have received the message lamp lighting instruction convert the message lamp lighting instruction into a PB signal and send it to the telephone exchange 1 in block 06. In the telephone exchange 1 which has received the PB signal, block S07 is executed.
In the message lamp control unit 11, the telephone 5a corresponding to the telephone number in the message lamp lighting instruction PB signal
５5n message lamps 6a の 6n are turned on to notify that there is a message.

Next, the operation of turning off the message lamp when reproducing a voice message will be described with reference to the flowchart shown in FIG.

The other party who is speaking or absent is the telephone 5
When the notice of lighting of the message lamps 6a to 6n of the telephones a to 5n is made, the message transmission message button or the message transmission specific number of the telephone set 5a to 5n is dialed.

In response to the request for reproducing the registration message, first, in block S10, the telephone line control unit 10 in the telephone exchange 1 connects to the voice modems 8a to 8d via the telephone line 3 and sends a PB signal for the message reproduction request. The message is sent to connect the telephone line 3 and the message storage device 2. Next, at block S11, the voice modems 8a to 8d digitize the received PB signal and transmit the telephone number and message reproduction information to the message storage device 2.

When receiving the message playback request, the message storage device 2 checks in step S12 whether there is an unplayed voice message in the message box of the telephone number. If there is no unplayed voice message, the flow shifts to block S17, where a talk key guidance indicating that there is no voice message to be played is played, and the line is disconnected.

If it is determined in block S12 that there is a voice message to be reproduced, the message information reproducing unit 25 performs a voice message reproduction process. Block S13
Then, the voice message data is sent from the message storage device 2 to the voice modems 8a to 8d,
After the data decompression process is performed at .about.8d, the data is converted into a voice signal, sent to the telephone exchange 1 via the telephone line 3, and reproduced. The voice message playback process of block S13 is repeatedly executed by the number of unplayed voice messages existing in the corresponding message box.

After confirming that there is no unplayed voice message in the corresponding message box, block S14 is executed.
Then, the message lamp control command unit 20 of the message storage device 2 sends a digital signal message lamp extinguishing instruction to the voice modems 8a to 8d.

Upon receiving the message lamp turn-off instruction, the voice modems 8a to 8d convert the contents of the message lamp turn-off instruction into a PB signal in block S15, and send them to the telephone exchange 1 via the telephone line 3. When the telephone exchange 1 receives the PB signal of the message lamp turn-off instruction, the message lamp control unit 11 determines in step S16 the telephone 5 corresponding to the telephone number in the message lamp turn-on instruction PB signal.
The message lamps 6a to 6n for a to 5n are turned off.
By turning off the message lamps 6a to 6n of the telephones 5a to 5n, it can be confirmed that there is no unplayed voice message.

In this manner, the on / off display control of the message lamps 6a to 6n of the telephones 5a to 5n is performed. The voice mail device manages the presence or absence of voice messages addressed to a plurality of telephones, and A message display instruction for the lamp is transmitted to the telephone exchange as a voice signal (frequency signal). Therefore, in the embodiment shown in FIG. 5, similarly to the embodiment shown in FIG. 1, the display of the message lamp of the telephone can be controlled without adding or modifying the existing telephone exchange by using the function of the electronic exchange as it is. A mail device can be easily introduced.

In the above description, the case where the voice mail device is additionally installed in the existing telephone exchange has been described. However, the present invention may be applied to the case where the telephone exchange and the voice mail device are newly installed. That is.

In the embodiment shown in FIGS. 1 and 5, it is also possible to pass check-in information and check-out information to the voice mail device 2 from the business telephone by a PB signal. By doing so, the check-in information permits the reception of voice mail to the room extension, and the check-out information deletes the message information,
It becomes possible.

[0060]

According to the present invention, the voice mail apparatus manages the presence / absence of voice messages addressed to a plurality of telephones, and transmits a message presence display instruction to the message lamp of the telephone to the telephone exchange as a voice signal (frequency signal). Therefore, the display of the message lamp of the telephone can be controlled without adding or modifying the existing telephone exchange by using the function of the electronic exchange as it is, and the voice mail device can be easily introduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating an example of a message lamp control command unit in FIG. 1;

FIG. 3 is an explanatory diagram of a frequency of a dial signal.

FIG. 4 is a diagram showing an example of a special dial number.

FIG. 5 is a configuration diagram showing another embodiment of the present invention.

FIG. 6 is a flowchart of a message lamp lighting process.

FIG. 7 is a flowchart of a message lamp extinguishing process.

[Explanation of symbols]

 1. Telephone exchange 2. Voice mail device 3. Voice line 4. Data line 5. Room phone 6. Message lamp 7. Relay console 8. Voice modem 10. Telephone line control of telephone exchange Unit 11 Message lamp control unit of telephone exchange 20 PB signal analysis unit of voice mail device 21 Operation control unit of voice mail device 22 Data reproduction unit of voice mail device 23 Message of voice mail device Information storage unit 24 Message lamp control unit of voice mail device

Continued on the front page (72) Inventor Kenichi Abe 5-2-1 Omikacho, Hitachi City, Ibaraki Prefecture F term in Hitachi Information & Control Systems Co., Ltd. (Reference) 5K015 AA04 AA10 AB01 AC01 AC04 AD01 AD05 GA02 5K024 AA72 BB05 BB07 CC01 CC14 DD01 DD04 EE01 EE09 FF02 GG03 GG12

Claims (9)

[Claims] 1. A plurality of telephones having a message lamp for displaying the presence / absence of a message, a telephone exchange for exchanging telephones of the plurality of telephones, and a telephone line connected to the telephone exchange with a voice line, and a voice based on a reproduction request. A voice mail device for playing back a message, wherein the voice mail device manages the presence or absence of a voice message addressed to the plurality of telephones, and transmits a message presence display instruction to a message lamp of the telephone to the telephone exchange as a voice signal. A message transmission system characterized by: 2. A plurality of telephones having a message lamp for displaying the presence / absence of a message, a telephone exchange for exchanging telephones of the plurality of telephones, and a telephone line connected to the telephone exchange via a voice line to reproduce from the telephone. A voice mail device that reproduces a voice message addressed to the telephone based on the request, wherein the voice mail device manages the presence or absence of voice messages addressed to the plurality of telephones, and issues a message presence display instruction to a message lamp of the telephone. A message transmission system for transmitting a frequency signal to the telephone exchange via the voice line. 3. A plurality of telephones having a message lamp for displaying the presence / absence of a message, a telephone exchange for exchanging telephones of these plural telephones, a relay stand for relaying a telephone call from an external telephone, and the telephone exchange. And a voice mail device that is connected by a telephone line, stores a voice message from the external telephone, and reproduces a voice message addressed to the telephone based on a reproduction request from the telephone,
The voice mail device manages the presence / absence of voice messages addressed to the plurality of telephones, and sends a message presence display instruction to a message lamp of the telephone to the telephone exchange via a voice line using a dial number combining frequency signals. A message transmission system, characterized in that: 4. A plurality of telephones having a message lamp for displaying the presence or absence of a message, a telephone exchange for exchanging telephones of the plurality of telephones and controlling display of the message lamp, and relaying a telephone call from an external telephone. A relay console, connected to the telephone exchange by a plurality of voice lines,
A voice mail device that stores a voice message from the external telephone and reproduces a voice message addressed to the telephone based on a reproduction request from the telephone, wherein the voice mail device has a voice message addressed to the plurality of telephones. And transmitting a message display indication to a message lamp of the telephone set to the telephone exchange via the plurality of voice lines by a dial number obtained by combining two frequency signals having different frequencies. . 5. A plurality of telephones having a message lamp for displaying the presence / absence of a message, a telephone exchange for exchanging telephones of the plurality of telephones, and a telephone line connected to the telephone exchange to convert a voice signal into a digital signal. And a message storage device that receives a digital signal from the voice modem, stores a voice message to be transmitted, and reproduces a voice message addressed to the telephone based on a reproduction request from the telephone. The message storage device manages the presence or absence of voice messages addressed to the plurality of telephones, adds a message presence display instruction to a message lamp of the telephone to the voice modem by a digital signal, and issues a message presence display instruction by the voice modem. Converted to a special dial number by frequency signal Messaging system and transmits to the telephone exchange via a line. 6. A plurality of telephones having message lamps for displaying the presence / absence of a message, a telephone exchange for exchanging telephones of the plurality of telephones and controlling display of the message lamps, and the telephone exchange and a telephone line respectively. A plurality of voice modems connected to each other for converting voice signals into digital signals; a digital signal from the plurality of voice modems being input to store voice messages to be transmitted, and addressed to the telephone based on a reproduction request from the telephone. And a message storage device for playing back voice messages. The message storage device manages presence / absence of voice messages addressed to the plurality of telephones, and outputs a message presence display instruction to a message lamp of the telephone by a digital signal using the voice modem. In addition to the above, there is a message display instruction by the voice modem Messaging system and transmits two of said telephone exchange through the telephone line and converts the dialed number and the telephone number that combines the frequency signals of different frequencies. 7. A plurality of room telephones provided in a guest room of a hotel and having a message lamp for displaying the presence / absence of a message, and a telephone exchange for exchanging telephones of the plurality of room telephones and controlling display of the message lamps. It is used for a hotel answering machine system provided with a telephone exchange connected to the telephone exchange by a voice line, manages the presence or absence of a voice message addressed to the plurality of telephones, and plays a voice message based on a playback request. A voice mail device for transmitting a message indicating display instruction to a message lamp of the telephone to the telephone exchange as a voice signal via the voice line. 8. A plurality of room telephones provided in a guest room of a hotel and having a message lamp for displaying presence / absence of a message, and a telephone exchange for exchanging telephones of the plurality of room telephones and controlling display of the message lamps. Is used in a hotel answering machine system having a relay stand for relaying a telephone call from an external telephone, connected to the telephone exchange with a telephone line, storing voice messages from the external telephone, and A dial number that manages the presence or absence of voice messages addressed to a plurality of telephones, reproduces voice messages addressed to the telephone based on a playback request from the telephone, and displays a message presence display instruction for a message lamp of the telephone in combination with a frequency signal. A voice message transmitted to the telephone exchange via a telephone line. Apparatus. 9. A plurality of room telephones provided in a hotel guest room and having a message lamp for displaying the presence / absence of a message, and a telephone exchange for exchanging the plurality of room telephones and controlling the display of the message lamps. Used in a hotel answering machine system provided with a relay stand for relaying a telephone from an external telephone, wherein a plurality of voices connected to the telephone exchanges by telephone lines and converting voice signals into digital signals, respectively. A modem and a message storage device that stores a voice message to be transmitted by inputting digital signals from the plurality of voice modems, and reproduces a voice message addressed to the telephone based on a reproduction request from the telephone, The message storage device manages the presence or absence of voice messages addressed to the plurality of telephones, A message display instruction for the message lamp is added to the voice modem by a digital signal, and the message modem display instruction is converted by the voice modem into a dial number obtained by combining two frequency signals having different frequencies and the telephone number, via the telephone line. A voice mail device for transmitting the voice mail to the telephone exchange.