JPH0832079B2 - Telephone switching equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a telephone exchange device that switches a call path between an external line and an internal line or between internal lines to form an external line call and an internal line call with a commercially available telephone. Is.

[Prior Art] FIG. 9 shows a system configuration of a telephone exchange device of this type. This telephone exchange device is a commercially available telephone exchange A which is connected to a central office E by an external line l ₁ via a disconnector G and a protector H, and an extension l ₂ and a control sensor l ₃ which are connected to the telephone exchange A. Telephone C is composed of a plurality of telephone outlets B which are detachably connected, and the telephone exchange A has an external line l ₁ and an internal line l ₂
Alternatively, the telephone line C connected to the telephone outlet B can be used to make an outside line call and an extension line call by switching the communication path between the extensions l ₂ . In this telephone exchange apparatus, the intercom D is connected to the telephone exchange A by the call line l ₄ , and the telephone C can be used for intercom conversation.

Each telephone outlet B is provided with a modular jack M so that a general commercially available telephone C can be detachably connected. Also,
The telephone outlet B is a speaker SP for reproducing the broadcast signal, such as the extension ring tone or intercom call sound transmitted through the control line l _3, the voltage signal transmitted through the control line l ₃ It is equipped with a light emitting display unit La, Lb that distinguishes the display signal that is and displays during an internal call or an external call, etc., so that the speaker SP and the light emitting display La, Lb perform notification and display operation. is there. The volume of the speaker SP can be adjusted with the volume adjustment switch VS.

As shown in FIG. 10, the telephone exchange A of this telephone exchange apparatus has relay contacts r ₁ to r _{1 for} each extension l ₂ to which the telephone C is connected.
r _3, provided with a hook dial pulse (DP) detector 2 ₁ to 2 ₃ and speech current supply circuit ₄₁ to _3, further incoming detecting circuit 5, the DC閉結circuit 3 performs Outbound dial pulse
DP generation circuit 6, push button (PB) dialer 7 for making an outside call with push button tone, outside line tone detection circuit 8 for detecting an outside tone, holding tone sending circuit 9 for sending a holding tone, and setting a call path Crosspoint switch
10, PB receivers 12, 13, which receive push button signals,
Sound generation circuit 17 that generates various notification sounds, display control circuit 18 that displays the call status at telephone outlet B, amplifier AMP ₁
~AMP _4, and includes a diode bridge DB, the gate G ₁ ~G _3, and a control circuit 11 composed of a CPU for sending control and signal determination processing of the control information signals of each circuit and later circuitry.

Further, the telephone exchange A is provided with intercom call detection circuits 14 ₁ and 14 ₂ for detecting a call from the intercom D and an intercom communication circuit 15. Further, although not shown in FIG. 9, this telephone exchange device can also be connected with a security device and an emergency push button so that an alarm sound can be issued from the telephone outlet B when an abnormality occurs. An abnormality detection signal from the security device is detected by the security signal detection circuit 16.

The operation of this telephone exchange device will be described. When the telephone exchange A is turned on and the system starts, the control circuit 11 first performs initialization and then goes into a standby state to determine whether it is off-hook, whether there is an outside line incoming call, outside line call processing, and intercom calling. The presence / absence determination and intercom call processing, the extension presence / absence determination / extension call processing, and the outside call processing are performed.

Now, when the handset of any of the telephones C is picked up, the hook / DP detection circuit 2 provided in the extension l ₂ to which the telephone C is connected detects an off-hook and outputs a detection signal to the control circuit 11. At this time, the control circuit 11 is normally an outside line
The relay contacts r _{1 to} r ₃ switched to the l ₁ side are switched to the crosspoint switch 10 side, and a pseudo outgoing signal of 400 Hz is sent to the telephone C off-hook via the extension l ₂ and simultaneously controls the display control circuit 18. Then, at each telephone outlet B, the light emitting display portion La for displaying the outside line call is turned on.

The sending of this pseudo outgoing signal continues until the input of the dial signal, and when the first dial signal is detected by the hook / DP detection circuit 2, the control circuit 11 stops the output of the pseudo outgoing signal and stores the dial data. It stores it in the FIFO type buffer memory, and at the same time operates the built-in 3-second timer. When the second dial signal is detected during the operation of this timer, the control circuit 11 determines that the call is an outside call, performs the outside call process, and if the second dial signal is not input within 3 seconds. It is determined that the call is an extension call and the extension call processing is performed.

Now, in the case of an outside line transmission, the control circuit 11 sequentially stores the dial signals input subsequently in the buffer memory, operates the DC closing circuit 3, and detects the outside line tone by the outside line tone detection circuit 8. Then, the dial data stored in the buffer memory is sequentially read from the first, and the dial pulse generation circuit 6 is operated to sequentially send the dial signals to the outside line l ₁ . When the dial data stored in the buffer memory is exhausted and a certain period of time elapses, the relay contact r is switched so that the extension l ₂ to which the off-hook telephone C is connected is connected to the outer line l ₁ to make an outside call. It is possible.

Next, in the case of an extension call, the control circuit 11 determines that an extension call is made 3 seconds after the input of the first dial signal, and each telephone outlet B that has been turned on from the off-hook of the telephone C. The light-emitting display unit La indicating that the external call is being made is turned off, and the light-emitting display unit Lb indicating that the extension call is being made is turned on at the same time. At the same time, the control circuit 11 controls the sound generation circuit 17 to send the extension call notification signal to the telephone outlet B to which the telephone C on the called side is connected via the control line l ₃ , and the telephone outlet B The extension ringing sound is emitted from the speaker SP. It should be noted that this notification signal is transmitted after being superimposed on the display signal. Then, when the handset of the telephone C connected to the telephone outlet B is picked up by the extension ringing tone, the hook / DP detection circuit 2 detects this off-hook, and the control circuit 11 outputs the extension ringing tone based on this off-hook. with stop, connects the extension l ₂ where telephone C of the called an extension l ₂ of the phone C is connected with the calling side is connected by the cross point switch 10 to allow extension call.

Next, an external line incoming call will be described. When an external call arrives, the built-in bell rings in each telephone C. The incoming signal at this time is detected by the incoming detection circuit 5, and the incoming detection signal is input to the control circuit 11. Taking up the handset of the telephone C according to the ringing of the built-in bell of the telephone C,
Allows outside line calls. When the telephone C is off-hooked in this manner, the control circuit 11 lights the light emitting display portion La of each telephone outlet B in accordance with the output of the hook / DP detection circuit 2 to display the outside line call.

By the way, in this telephone exchange device, an outside line call can be put on hold during an outside line call to make an extension line call or a doorphone call.

In this case, when a dial signal corresponding to the hold is input from the telephone C during an outside call, the control circuit 11 reads the dial data, disconnects the extension l ₂ from the outside l ₁ , and simultaneously closes the DC circuit. 3 is operated to put the outside line l ₁ in a hold state. Then, the control circuit 11 operates the hold sound generation circuit 9 to send the hold sound melody to the outside line l ₁ via the coupling transformer T to notify the outside line call partner that the hold is being held, and to each telephone outlet B. Also sends a hold tone melody to let the user recognize that it is on hold, and at the same time, simultaneously controls the display control circuit 18 to turn on both the light emitting display sections La and Lb for a call and put them on hold. Is displayed.

Now, after entering the hold state, if a dial signal for performing an extension call or an intercom call is input from the telephone C, the extension call process described above or the intercom call process described below is performed, and the extension call or the intercom call is performed. It will be possible.

Here, in order to prevent the dial signal input from the telephone C during the outside line call from being output to the outside line l ₁ , the DC closing circuit 3 is temporarily closed at the same time when the dial signal is input.

The extension call or the like that is on hold ends when the telephone C is on-hook, and when the handset of the telephone C is picked up again, it returns to the hold state.

If you want to make an outside line call again, phone C
Input the dial signal for canceling the hold from to cancel the hold. At this time, the control circuit 11 stops the operation of the hold sound sending circuit 9, controls each unit to the original outside line communication state, and returns to the outside line communication state. When the call is terminated after releasing the hold, the telephone C may be hooked on the hook.

Hereinafter, a case where a doorphone is called will be described.
When calling from the intercom D, the push button provided on the intercom D is pressed. The pressing of this push button is detected by the intercom ringing detection circuit 14, and the control circuit 11 operates the sound generation circuit 17 in response to the detection output to make the intercom ringing sound from each telephone outlet B. When one of the handsets of the telephone set C is picked up in response to the ringing tone of the intercom, the control circuit 11 is activated by the output of the hook / DP detection circuit 2 provided in the extension l ₂ to which the off-hooked telephone set C is connected. Switch the crosspoint switch 10 to pick up the handset C and the intercom communication circuit
Connect with 15 to enable intercom communication.

By the way, this doorphone call is made from the telephone outlet B even during an outside line call. When the dial signal for specifying the doorphone D is input from the telephone set C after the above-mentioned hold according to this call, the outside line is held and the doorphone is held. You can make calls.

In the above description, the dial pulse type telephone is used as the telephone C, and the case where the external line l ₁ which is a public telephone line is a dial pulse line has been described.
When ₁ is a push button line and the push button type telephone C is used, the dial signal is transmitted by the PB dialer 7 and the PB receiver 1 detects the dial signal.
It operates in the same manner as the above description except that steps 2 and 13 are performed.

[Problems to be Solved by the Invention] However, in the conventional telephone exchange apparatus of this type, it is necessary to distinguish between hooking and end call in order to receive a service such as call waiting. Therefore, when a fixed time (for example, 2 seconds) has passed since the end of call detection was hooked, the end of call is determined. Therefore, even if the on-hook is made within the above-mentioned fixed time, it is not judged that the call is the end of the call. Therefore, when newly making an outside call after the outside call, the on-hook of 2 seconds or more is required. Here, if you start dialing after on-hook within the fixed time,
The function to prevent the dial signal for call processing such as the hold operation during an outside line call described above from being output to the outside line l ₁ ,
This is an inconvenient operation for a user who cannot make an outside line and continuously makes a call. In addition, if the first dial signal of the telephone number of the other party matches the holding dial signal, the holding process is performed, and the user may feel a malfunction.

Therefore, when a dial signal is input within a fixed time after the hooking is input as described above, the control circuit 11 determines that the operation is an outside line transmission operation after disconnecting the outside line, and performs an outside line transmission process. The telephone exchange device thus constructed is proposed by the present inventors in Japanese Patent Application No. 1-164394.
In this way, it is possible to make an outside line call even on-hook within the fixed time.

However, in this type of telephone exchange apparatus, there is a case where a push-button type telephone is used as the telephone C, and in this case, there is a possibility that a telephone call processing such as holding is performed by a dial signal from the telephone of the other party of the outside telephone. In some cases, call processing during a call is performed by inputting a dial signal for call processing after hooking so that the dial signal from the outside line call partner can be identified. In such a telephone exchange device, even if a dial signal is input after hooking, it is not always an outside call, and there is a problem that call processing during an outside call and outside call cannot be distinguished.

The present invention has been made in view of the above points, and an object of the present invention is to use a push-button telephone and input a dial signal for call processing after hooking to perform call processing during an outside call. Even in a telephone exchange device for performing external calls, it is to eliminate inconvenience and malfunction when newly making an external call after an external call. [Means for Solving the Problems] To achieve the above object, the present invention provides an external call. Hooking detection means for detecting hooking by the inside telephone, timekeeping means for timing the time from hooking, storage means for storing the input dial signal, and dial signal input within the first fixed time after hooking If not, the outside line call state is continued, the first dial signal is input within the first fixed time after hooking, and the dial signal for call processing is If the next dial signal is not input before the second fixed time elapses after the large digit number is input, it is determined that the dial signal is a dial signal for call processing during an outside call, and the call processing is executed, and the second call is performed. If there is an input of the next dial signal within a certain period of time, it is determined that the operation is an outside line transmission operation after disconnecting the outside line, and a control means for performing an outside line transmission process based on the dial signal stored in the storage means. I have it.

It should be noted that, assuming that the holding process is performed immediately when the user performs the holding operation, and considering the case where the telephone set is immediately on-hook, the above-mentioned control means sets the first fixed time after hooking during an outside line call. If a dial signal for holding is input in the telephone and the telephone is on-hook before the second fixed time thereafter, the holding processing may be performed.

[Operation] As described above, the present invention provides the first means after the control means is hooked.
If the first dial signal is input within the fixed period of time, and the next dial signal is not input before the second fixed time elapses after the maximum number of digits of the dial signal for call processing is input, an outside line call is in progress. If it is judged that it is a dial signal for call processing, the call processing is executed, and if the next dial signal is input within the second fixed time, it is the outside line transmission operation after disconnecting the outside line. By determining and performing the outside line transmission processing based on the dial signal stored in the storage means,
Even in a telephone exchange that uses a push-button telephone to perform call processing during an external call by hooking and then inputting a dial signal for call processing, it is possible to reliably distinguish call processing during an external call and outgoing call. , It is possible to eliminate malfunctions when making a new outside line call during an outside line call, and the next dial signal of the dial signal for the call processing is input before the second fixed time elapses after the maximum number of digits of the dial signal is input. If there is an input, it is possible to make an outside line call even if the on-hook time for ending the call is short by determining the outside line call operation after disconnecting the outside line once and performing the outside line call process. It is designed to be convenient when making a phone call.

Further, when the control means inputs the hold dial signal within the first fixed time after hooking during an outside line call and the telephone is on-hook by the second fixed time thereafter, the hold processing is performed. If the user performs the hold operation, it is considered that the hold process is performed immediately after the user performs the hold operation, and when the phone is immediately on-hook, the call can be prevented from being disconnected and the usability is improved.

[Embodiment] FIGS. 1 to 8 show an embodiment of the present invention. The circuit configuration of this embodiment is exactly the same as that of the conventional example, and the feature of this embodiment lies in the call processing method during an outside call. In this telephone exchange apparatus, a push-button telephone C is used to perform an operation (hereinafter, this operation is called a command) that combines hooking and dial signal input for call processing during an outside call. . Call processing during call processing and its operation are shown below.

However, the general call is an operation of calling all the telephones C, and the intercom connection is an operation of responding to the call from the intercom D. For reference, the call processing and the operation at the time of making a call will be shown below.

In this embodiment, hooking detection means for detecting hooking by the telephone C during an outside call, a plurality of timers as time counting means for measuring the time from the hooking, and storage means for storing the input dial signal. If the dial signal is not input within the first fixed time period (for example, 5 seconds) t ₁ after hooking, the outside line communication state is continued, and the first constant time period t ₁ after hooking If the second dial signal is not input before the second fixed time (for example, 2 seconds) t ₁₂ has elapsed after the first dial signal is input, it is a dial signal for call processing during an outside line call. running to call processing determines that, it is determined that the if there is an input of the second of the second dial signal constant time t ₁₂ within an external line transmission operation once the spoke end the external call Ba Having features and control means for performing external call processing based on the dial signal stored in Famemori in that it is provided to the control circuit 11.

The characteristic operation of this embodiment will be described below. In addition,
FIG. 1 shows a state transition diagram of the telephone exchange device of this embodiment.
FIG. 2 shows a more detailed state transition diagram when hooking is performed during an outside line call.

First, a case will be described in which the user hooks during an outside line call in order to receive a call waiting service, for example. When hooking is performed as shown in FIG. 3 (a), the control circuit 11 clears the contents of the buffer memory and starts the time-delaying operation of the timer that counts the _first predetermined time t1. In the state transition diagram shown in the figure, the external telephone call (state a in the figure) is shifted to step 1 (b ₁ ) (FIG. 3 (d)). Here, when receiving the waiting call service, the dial signal is not input within the time limit t ₁ of the timer, so after the time limit t ₁ elapses, the outside line call state (a)
By returning to step 1, the call state of the outside line is continued and the call waiting service can be received as usual. Here, during the time t ₁ , the relay contact r is disconnected from the external line l ₁ as shown in FIG. 3 (c), and the DC closed circuit 3 is operated as shown in FIG. 3 (b). The state of step 1 (b ₁ ) is set. FIG. 3 (e) shows the signal transmission state on the external line l ₁ .

However, when a dial signal is input from the dial pulse type telephone C in the outside line call state (a) in FIG. 2, a call process during an outside line call based on the dial signal (for example, described in the conventional example). (Holding process, etc.) is executed (indicated by c in FIG. 2). Further, when the dial signal is simply input from the push button type telephone C without hooking, the control circuit 11 does not perform any processing depending on the dial signal. Further, when the dial pulse type telephone C terminates an outside line call on-hook and newly dials to make an outside line call, it is performed for a certain period of time in substantially the same manner as in JP-A-1-164394 described in the conventional example. When a dial signal is input within t ₁ , the control circuit 11 determines that the call is an outside line call after the end of the outside line call and performs an outside line call process (a → b ₁ → d _{1 in} FIG. 2). And transition). Further, when hooking is further repeated in step 1 (b ₁ ), the buffer memory clearing process is repeated, and step 1 (b ₁ )
Stay in the state of.

Next, in the case of a call processing operation other than the hold operation, for example, when performing a paging after holding, a dial for making a paging after holding within the time t ₁ after hooking of the telephone C as shown in FIG. 4 (a). Input the signal "9". In this case, hooking causes a transition from the outside line communication state (a) to step 1 (b ₁ ) in FIG. 2 and a transition from step 1 (b ₁ ) to step 2 (b ₂ ) by inputting a dial signal. . When the dial signal is input in step 1 (b ₁ ), the timer for counting the second predetermined time t ₁₂ is started to store the dial signal in the buffer memory and
The command, which is the call processing content indicated by the dial signal, is stored in another buffer memory, and the process proceeds to step 2 (b ₂ ). In this case, since only the one-digit dial signal is input, the command during the outside call is executed when the time limit t _{12 of the} timer elapses in step 2 (b ₂ ) (see FIG. 2). C) and as shown in FIG. 4 (d), a general call is made.

When ending an outside line call and making an outside line call, as shown in FIG. 5 (a), a dial signal of two or more digits is input after hooking. Therefore, also in this case, similarly to the above description, the process proceeds to step 1 (b ₁ ) by hooking and to step 2 (b ₂ ) by inputting the first dial signal. Further, in this case, since the second dial signal is input within the constant time t ₁₂ in step 2 (b ₂ ),
In this case, the timer that timed t ₁₂ is cleared, and the timed operation is started for a certain time (2 seconds) t ₂₃ , the dial signal input at that time is written in the buffer memory, and the command is written in the buffer memory. Then, the process proceeds to step 3 (b ₃ ). Then, when the third dial signal is input in step 3 (b ₃ ), the dial signal and the command are written in the buffer memory, and then the external line l ₁ is used to terminate the external line call. Disconnect temporarily.
The disconnection of the external line l ₁ is performed by temporarily deactivating the DC closed circuit 3 in the operating state during the signal processing as shown in FIG. 5 (b). FIG. 5 (e) shows a state in which the outside line is separated in this case. After disconnecting the outside line, the dial signal is sent to the outside line l ₁ by the PB dialer 7 based on the dial signal stored in the buffer memory (shown by d ₂ in FIG. 2) as shown in FIG. 5 (e).

Here, when the third dialing signal is not input to the step 3 (b ₃₎ within a predetermined time t ₂₃ as shown in FIG. 6, regarded as the dial signal is invalid dial an external call Return to state (a). That is, in the case of the present embodiment, the command for call processing has one digit and the outside line transmission has at least three digits.

The pending operation that was not included in the above description (note that
The first dial signal after ending the outside call is "0"
(Including an outside line transmission process in the case of).

When holding, enter dial signal "0" after hooking. In this case, transition from outside call state (a) by hooking in Step 1 (b _1), the dial signal "0" is input to the predetermined time t ₁ in step 1 (b _1), the dial signal At the same time as writing to the buffer memory, activate the timer that limits the time t ₁₂ ,
Move to (b ₄ ). Then, in the case of this hold operation, since the dial signal is not input thereafter, the time limit time t _{12 of the} timer elapses, and at the time when this time elapses, the command execution during the outside line call (c in FIG. 2), that is, Is suspended. Note that in this embodiment, it is considered that the user performs the hold processing immediately after the input of the hold command, and in consideration of the case where the telephone C is immediately on-hook after the input of the command, in step 4 (b ₄ ) the on-hook is performed. In this case, the hold is performed as shown in FIG. 7 even before the elapse of the time limit t ₁₂ , and the hold state shifts to the off state (standby state) in FIG. However, other steps 1 (b
₁ ) to step 3 (b ₃ ) and step 5 (b ₅ ) which will be described later, when an on-hook occurs, the state shifts to the off state (not the hold state).

By the way, with this telephone exchange, it is possible to perform simultaneous ringing after holding by dialing a dial signal (such as "9") after hooking as shown in the table above. It is conceivable to perform a hold operation of inputting "" and then newly input a dial signal "9" for general paging, for example. Therefore, the present embodiment is adapted to cope with this case as well.

That is, if two digits of dial signals "0" and "9" are input after hooking as shown in FIG. 8 (a), the hooking and dial signal "0" cause step 4 (b ₄ ) as described above. migrated, when the second dial signal "9" is input to the predetermined time t ₁₂ in the step 4 (b _4), the
The timer for timing the time t ₁₂ is cleared, the timer for timing the time t ₂₃ is activated, the dial signal is stored in the buffer memory, and the process proceeds to step 5 (b ₅ ). This because when no dialing signal of the second and subsequent inputted, on the time limit time t ₂₃ executes the hold processing Upon expiration, (shown by e in FIG. 2) which simultaneously execute the call command. Here, when the third dial signal is input,
The outside line transmission processing indicated by d ₂ in FIG. ₂ is executed. In addition,
In addition to the dial signal "7" input after hooking, the intercom call during the outside line call also dials "0", "after hooking.
You can also type in 7 ".

By the way, if hooking is performed in steps 2 to 5, the process can be returned to step 1 (b ₁ ), in which case the stored contents of the buffer memory are cleared. Also,
In the above description, the case where the dial signal for call processing is all one digit except for hooking during call processing during an outside line call is explained, but the first dial signal within the first constant time t ₁ after hooking. Is input and the next dial signal is not input until the second constant time t ₁₂ elapses after the maximum number of digits of the dial signal for call processing is input, it means that the dial signal is for call processing during an outside line call. run the call processing to determine, the if there is an input of the second predetermined time t ₁₂ following dialing signals into, once determined to external call processing to be external line transmission operation after cutting the outside line l ₁ By doing so, it is possible to deal with the case where the dial signal for call processing has two or more digits.

EFFECTS OF THE INVENTION As described above, according to the present invention, the control means inputs the first dial signal within the first fixed time after hooking,
If the next dial signal is not input before the second fixed time elapses after the maximum number of digits of the dial signal for call processing is input, it is determined that the dial signal is for call processing during an outside line call and call processing is performed. If the next dial signal is input within the second fixed time, it is determined that the operation is an outside line transmission operation after the outside line is disconnected, and the outside line transmission is performed based on the dial signal stored in the storage means. Since processing is performed, even in a telephone exchange that uses a push-button telephone to perform call processing during an outside line call by entering a dial signal for call processing after hooking, call processing during an outside line call and outside call Can be reliably identified, and a malfunction when newly making an outside line call during an outside line call can be eliminated. Also,
If the next dial signal is input before the second fixed time elapses after the maximum number of digits of the dial signal for call processing is input, it is determined that the operation is an external line transmission operation after disconnecting the external line, and an external line transmission is performed. Since the processing is performed, it is possible to make an outside line even when the on-hook time for ending the call is short, which is convenient when making a continuous call.

Further, when the control means inputs the hold dial signal within the first fixed time after hooking during an outside line call and the telephone is on-hook by the second fixed time thereafter, the hold processing is performed. If the user performs the hold operation, it is considered that the hold process is performed immediately after the user performs the hold operation, and when the phone is immediately on-hook, the call can be prevented from being disconnected and the usability is improved.

[Brief description of drawings]

FIG. 1 is a state transition diagram of the operation of the present invention, FIG. 2 is a state transition diagram of the main operation, and FIGS. 3 to 8 are operation explanatory diagrams of the same.
FIG. 9 is a system configuration diagram of the telephone exchange device, and FIG. 10 is a circuit diagram of the telephone exchange device. A is an exchange, C is a telephone, E is a telephone office, 11 is a control circuit,
l ₁ is an outside line and l ₂ is an inside line.

Claims (2)

[Claims] 1. A telephone exchange that is connected to a central office via an outside line, and a plurality of push-button telephones that are connected to the telephone exchange by extension lines, and the telephone exchange is connected to an outside line and an extension line or an extension line. By switching the call path between each other, it enables outside calls and extension calls with the above-mentioned telephone, and when the push button type telephone is used, the call processing during the outside call is hooked and the dial signal for the call processing is input after hooking. In a telephone exchange apparatus performed by means of the above, a hooking detection means for detecting hooking by a telephone during an outside call, a timekeeping means for timing the time from the hooking, a storage means for storing an input dial signal, and a first hooking means If the dial signal is not input within the fixed period of time, the outside line call state is continued and the first dial is started within the first fixed period after hooking. If a dial signal is input and the next dial signal is not input before the second fixed time elapses after the maximum number of digits of the dial signal for call processing is input, it is a dial signal for call processing during an outside line call. If the next dial signal is input within the second constant time, it is determined that the operation is an outside line transmission operation after the outside line is disconnected, and the result is stored in the storage means. A telephone exchange apparatus comprising: a control unit that performs an outside line transmission process based on a dial signal. 2. The control means inputs a holding dial signal within a first fixed time after hooking during an outside line call, and the telephone is on-hook by the second fixed time thereafter. In this case, the holding process is performed.
The telephone exchange described.