Private branch of exchange system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a private branch exchange (hereinafter abbreviated as PBX) system that accommodates a wired terminal and a wireless terminal on the extension side.

【0002】

[Conventional technology]

In a conventional PBX system, for example, as shown in FIG. 22, an audio channel consisting of a wired terminal extension interface (hereinafter, the interface is abbreviated as I / F) 1, a wireless terminal extension I / F5, and an outside line I / F3 is an exchange processing unit. Connected to each other via 4, wired terminal extension I / F1 is connected to wired terminal 2 with a cable, wireless terminal extension I / F5 is connected to wireless terminal 6 via wireless channel, and external line I / F3 Is connected via a cable to the public switched telephone network or the extension of the upper PBX system (not shown). This enables mutual communication between the outside line, the wired terminal 2, and the wireless terminal 6.

【0003】

Actually, which extension is connected to which extension terminal and which extension terminals are connected to each other are called call control information given via the outside line I / F3, the wired terminal extension I / F1 and the wireless terminal extension I / F5. The call control unit 7 obtains the extension I / F corresponding to the extension number of the call control information by using the information regarding the correspondence between the extension number and the extension I / F managed by the extension terminal management unit 8. , A desired communication path is formed by instructing the exchange processing unit 4 of the connection path of the voice channel.

【0004】

The information about the extension number and extension I / F of the extension terminal management unit 8 used at this time was decided at the time of system introduction, and the correspondence was fixed. Further, if the correspondence between the wireless terminal extension I / F5 and the wireless terminal 6 is fixed, the movable range of the wireless terminal 6 is limited to the range reached by the radio waves of the wireless terminal extension I / F5. In some systems, wireless terminals are dynamically managed without fixing the correspondence between the terminals and the I / F so that they can be connected via the extension I / F of any wireless terminal in the system.

【0005】

By the way, in such a system, a wireless terminal is used as a replacement for a wired terminal in various places such as a conference room by taking advantage of the mobility due to the absence of a cord. However, wireless terminals are more expensive than wired terminals, and the number of buttons has been reduced to reduce size and weight, and they are inferior in operability to wired terminals. In most cases, it has been done. Also, in a general office, it is rare that one telephone is assigned to each person, and in most cases, one telephone is shared by several people.

【0006】

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional PBX system, the correspondence between the extension number and the extension terminal is fixed, so that the person who wants to use the wireless terminal has to replace the wired terminal with the wireless terminal at the expense of operability. there were. In addition, since each telephone is not assigned to each person, there is a problem that if one person goes out with a wireless terminal, other people who use the same terminal cannot use the telephone.

【0007】

In view of the above problems, it is an object of the present invention to make effective use of a wireless terminal by normally using a wired terminal and using the wireless terminal only when necessary. Another object of the present invention is to prevent the wireless terminal from being taken out when the extension number is not set when the wireless terminal is used. Furthermore, when multiple people are using the wired terminal, it is an issue to provide an environment in which even if one person takes out the wireless terminal, the remaining people can continue to use the wired terminal. ..

【0008】

[Means for solving problems]

In order to solve the above problems, the present invention has the following configuration. That is, the present invention includes an extension terminal management means for managing the correspondence between an extension number and a terminal, an extension number setting means, and a wireless terminal storage state confirmation means in a private branch exchange system for accommodating a wired terminal and a wireless terminal on an extension. An extension number is set by the extension number setting means in a state in which a wireless terminal storage unit for storing the wireless terminal is provided and the terminal is determined to be stored by the terminal storage state checking means. In this case, the correspondence between the extension number of the extension terminal management means and the extension terminal is rewritten, the correspondence between the extension number and the terminal is changed from the wired terminal to the wireless terminal, and thereafter, the wireless terminal is used as a terminal having the set extension number. It is a private branch exchange system characterized by handling.

【0009】

Further, according to the present invention, in a private branch exchange system in which a wired terminal and a wireless terminal are accommodated in an extension, an extension terminal management means for managing the correspondence between the extension number and the terminal, a wireless terminal having an extension number setting means, and the wireless terminal are used. It is provided with a wireless terminal storage state confirmation means for storing and a wireless terminal storage unit having a data exchange means for exchanging data with the stored wireless terminal, and the terminal is stored by the terminal storage state confirmation means. When the extension number is set by the extension number setting means in the determined state, the wireless terminal storage unit indicates that the extension number setting operation has been performed by the wireless terminal via the data exchange means. The correspondence between the extension number of the extension terminal management means and the extension terminal is rewritten, the correspondence between the extension number and the terminal is changed from the wired terminal to the wireless terminal, and thereafter, the wireless terminal is changed to the terminal having the set extension number. It is a private branch exchange system characterized by being treated as.

【0010】

Further, in the present invention, the wireless terminal storage unit may be further provided with a wireless terminal locking means and an unlocking means for unlocking the wireless terminal when the extension number is set by the extension number setting means. ..

【0011】

Further, in the present invention, the wireless terminal storage unit is further provided with an abnormality notification means, and the terminal is not stored by the terminal storage state confirmation means before the extension number setting means is activated in the wireless terminal storage unit. If it is determined that the abnormality is determined, the abnormality can be notified by the abnormality notification means.

【0012】

Further, in the present invention, the terminal storage state confirmation means and the abnormality notification means are provided on the wireless terminal side, and the terminal is stored in the wireless terminal storage unit by the terminal storage state confirmation means before the extension number setting means is activated. If it is determined that the error has not been made, the abnormality can be notified by the abnormality notification means.

【0013】

Further, in the present invention, when it is confirmed that the terminal has been taken out by the terminal storage state confirmation means and then the terminal has been returned by the terminal storage state confirmation means, the correspondence between the extension number and the terminal is the original. It can be returned to a wired terminal.

【0014】

Further, in the present invention, the extension terminal management means can associate a plurality of extension numbers with one terminal instead of one-to-one correspondence between extension numbers and terminals.

【0015】

[Action]

In the PBX system configured as described above, when the extension number is set by the extension number setting means while the wireless terminal is stored in the wireless terminal storage unit, the correspondence between the extension number and the extension terminal is wireless from the wired terminal. Since it switches to the terminal, all subsequent incoming calls are notified to the wireless terminal, and the wireless terminal operates as if it has the set extension number.

【0016】

Further, even when the extension number setting means is in the wireless terminal, the same setting is possible because the information is transmitted to the wireless terminal storage unit via the data exchange means. Then, since the wireless terminal locking means locks the terminal until the extension number is set, it is possible to prevent an error such as taking out the wireless terminal without setting the extension number. Further, even if there is no wireless terminal locking means, it is recognized that the wireless terminal storage unit or the wireless terminal itself has been taken out in a state where the extension number is not set by the extension number setting means and the terminal storage state confirmation means, and the abnormality notification means. Notify by.

【0017】

Then, when it is detected that the wireless terminal has been returned to the wireless terminal storage unit, the extension terminal management means returns the correspondence between the extension number and the terminal to the original wired terminal, and thereafter, the extension number is assigned to the wired terminal. It works as a thing. Furthermore, by making it possible to associate a plurality of extension numbers with one terminal, the wireless terminal has only the set extension number, and the wired terminal is set as the wireless terminal among the preset extension numbers. A number other than the extension number is set.

【0018】

[Example]

[Example 1] FIG. 1 is a block diagram showing a configuration of a first embodiment of a private branch exchange system (hereinafter abbreviated as PBX system) according to the present invention, and corresponds to claim 1. In the figure, the PBX system of this embodiment includes a wired extension I / F1, a wired terminal 2, an outside line I / F3, an exchange processing unit 4, a wireless extension I / F5, a wireless terminal 6, and call control. It is composed of a unit 7, an extension terminal management unit 8, an extension number setting unit 10, and a wireless terminal storage unit 9 including a terminal storage state detection unit 11. Normally, a plurality of outside lines are drawn into the PBX system, the outside line I / F3 can support a plurality of outside lines, and a plurality of wired terminals 2 and a plurality of wireless terminals 6 are also connected to each other.

【0019】

A voice channel consisting of a wired terminal extension I / F1, a wireless terminal extension I / F5, and an external line I / F3 is connected to each other via an exchange processing unit 4, and the wired terminal extension I / F1 is connected to the wired terminal 2 by a cable. Also, the wireless terminal extension I / F5 is connected to the wireless terminal 6 via a wireless channel, and the external line I / F3 is connected via a cable to the extension of a public telephone network or upper PBX system (not shown), thereby providing an external line. -It is the same as the conventional PBX system that mutual communication between the wired terminal 2 and the wireless terminal 6 becomes possible.

【0020】

Further, FIG. 7 is an external view showing how the wireless terminal 6 in the same embodiment is stored in the wireless terminal storage unit 9. In this embodiment, the movable protrusion 133 for locking the wireless terminal, the electrode 136 for data exchange, and the buzzer 141 for abnormal notification in FIG. 7 are unnecessary. In FIG. 7, the extension number setting unit 10 is configured by the extension number display unit 131, the dial button 139, the extension number setting button 138, and the cancel button 140.

【0021】

When the call control unit 7 receives an incoming call for the extension number assigned to the wireless terminal 6, the call control unit 7 transmits the incoming call to the wireless terminal by the terminal number instead of the extension number, and when making a call from the wireless terminal 6, the wireless terminal number is used. It is equivalent to the conventional PBX system except that it is converted to the extension number assigned to the wireless terminal 6 and transmitted to the called party. Since the other components are the same as those of the conventional ones, the same reference numerals are given and detailed description thereof will be omitted.

【0022】

Hereinafter, the operation when the wireless terminal 6 is taken out will be described with reference to the flowchart of FIG. First, when taking out the wireless terminal 6, use the dial button 139 on the wireless terminal storage unit 9 to enter the extension number to be assigned to the wireless terminal (step S1). If the extension number is entered, the process proceeds to step S2, and the presence or absence of the wireless terminal 6 is checked.

【0023】

At this time, when the wireless terminal 6 is mounted in the wireless terminal storage recess 137, the micro switch 132 is in the state of being pushed down. In this case, the dial input in step S1 is supported. The characters (numbers / symbols) to be used are echoed back to the extension number display unit 131 (step S3). On the contrary, when the wireless terminal 6 is taken out from the wireless terminal storage recess 137, the micro switch 132 is in the raised state, and all the micro switches on the wireless terminal storage 9 are in this state. If there is, since there is no wireless terminal 6 that can be taken out, the process proceeds to step S7, the extension number display is turned off, and the process ends.

【0024】

If wireless terminal 6 is present in step S3, check if the setting button 138 has been pressed (step S4). If not pressed, proceed to step S5 and check if the cancel button 140 is pressed. If the cancel button is not pressed in step S5, return to step S1 and wait for the next digit of the extension number to be entered. If the cancel button is pressed in step S5, proceed to step S7 to display the extension number. Erase and finish.

【0025】

If the setting button 138 is pressed in step S4, the process proceeds to step S6, and the specified extension number exists in the table by referring to the management table (shown in FIG. 9) of the extension terminal management unit 8 and is wireless. Check if it is assigned to the terminal. Here, if the extension number does not exist in the table or is already assigned to another wireless terminal, the process proceeds to step S7, the extension number display is erased, and the process ends.

【0026】

If it is determined in step S6 that the extension number is appropriate, the process proceeds to step S8, and the terminal I / F of the management table of the extension terminal management unit 8 is used by the wireless terminal 6 for the time being (to the wireless extension I / F5). Rewrite the I / F number (equivalent) and set the terminal number of the wireless terminal 6 corresponding to the setting button 138 (Fig. 10).

【0027】

When the call control unit 7 receives an incoming call for the extension number assigned to the wireless terminal 6, the call control unit 7 transmits the incoming call to the wireless terminal by the terminal number instead of the extension number, and when making a call from the wireless terminal 6, the wireless terminal number is used. It is equivalent to the conventional PBX system except that it is converted to the extension number assigned to the wireless terminal 6 and transmitted to the called party. The components without other explanations are the same as the conventional ones.

【0028】

[Example 2] FIG. 2 is a block diagram showing a configuration of a second embodiment of the private branch exchange system according to the present invention, and corresponds to claim 2. FIG. 11 is an external view showing how the wireless terminal 25 in the same embodiment is stored in the wireless terminal storage unit 29. In this embodiment, the movable protrusion 156 for locking the wireless terminal shown in FIG. 11 is unnecessary.

【0029】

In FIG. 11, the extension number setting unit 27 is configured by the extension number display unit 152, the extension number setting button 153, the cancel button 154, and the dial button 155. Here, these components are not special, but are diverted from the components originally possessed by the wireless terminal 25.

【0030】

Regarding the operation when the wireless terminal 25 is taken out, operations and display control commands on the wireless terminal are exchanged between the wireless terminal 25 and the data exchange unit 30 of the wireless terminal storage unit 29 via the data exchange electrode 158. The operation is the same as that of the first embodiment except that the above points are observed.

【0031】

In this embodiment, step S8 in FIG. 8 is replaced with the flowchart in FIG. If it is determined in step S6 that the set extension number is appropriate, the process proceeds to S10, and the terminal I / F of the management table of the extension terminal management unit 28 is used by the wireless terminal 25 for the time being (wireless extension I /). Rewrite to the I / F number (corresponding to F5) (Figs. 12 and 13).

【0032】

Then, the extension number set in step S11 is registered in the wireless terminal 25. In this case, the call control unit 26 does not need to be aware of the terminal number as in the first embodiment, and can use the extension number shown in the call control information as it is. Therefore, the management table of the extension terminal management unit 28 does not require a wireless terminal number as shown in FIGS. 12 and 13.

【0033】

The operation of step S11 in this embodiment is not essential, and only the operation of step S10 may be performed. On the contrary, even in the case of the first embodiment, the data exchange electrode 136 is prepared, and the extension number is set to the wireless terminal 6 through the electrode 136, whereby the processing of the call control unit 7 and the extension terminal management unit 8 is carried out. It is reduced as in the example.

【0034】

[Example 3] FIG. 3 is a block diagram showing a configuration of a third embodiment of the private branch exchange system according to the present invention, and corresponds to claim 3. FIG. 7 is an external view showing how the wireless terminal 6 in the same embodiment is stored in the wireless terminal storage unit 49. In this embodiment, the data exchange electrode 136 and the abnormality notification buzzer 141 shown in FIG. 7 are unnecessary.

【0035】

In FIG. 7, the extension number setting unit 50 is configured by the extension number display unit 131, the dial button 139, the extension number setting button 138, and the cancel button 140, as in the first embodiment.

【0036】

First, the wireless terminal 6 has a wedge-shaped recess 142 on the side surface, and a movable protrusion 133 for locking the wireless terminal is located at a corresponding position of the recess 137 for storing the wireless terminal, and the protrusion is controlled by the wireless terminal lock control unit 47. , It can be accommodated in the wall surface of the recess 137 for storing the wireless terminal. When the wireless terminal 6 is attached to the wireless terminal storage recess 137, the movable protrusion 133 for locking the wireless terminal protrudes in a shape that meshes with the wedge-shaped recess 142 on the side surface of the wireless terminal 6, and the wireless terminal is locked. It is in.

【0037】

The operation when the wireless terminal 6 is taken out is the same as that of the first embodiment except that step S8 in FIG. 8 is replaced with the flowchart in FIG. That is, step S20 is the same as step S8, except that the wireless terminal 6 can be taken out by accommodating the wireless terminal locking movable projection 133 on the wall surface in step S21. Since this state occurs only when the extension number is set correctly, the wireless terminal 6 cannot be taken out even if the extension number is not set.

【0038】

[Example 4] FIG. 4 is a block diagram showing a configuration of a fourth embodiment of the private branch exchange system according to the present invention, and corresponds to claim 4. FIG. 7 is an external view of the wireless terminal storage unit in the same embodiment. In this embodiment, the movable protrusion 133 for locking the wireless terminal and the electrode 136 for data exchange in FIG. 7 are unnecessary.

【0039】

In FIG. 7, the extension number setting unit 70 is configured by the extension number display unit 131, the dial button 139, the extension number setting button 138, and the cancel button 140, as in the first embodiment.

【0040】

The operation when the wireless terminal 6 is taken out is shown in the flowchart of FIG. 16, but the operations other than steps S30, S31, S38, S39, and S40 are the same as those in the first embodiment. Omit.

【0041】

The unused wireless terminal 6 is set in the wireless terminal storage recess 137 of the wireless terminal storage unit 69, and all the wireless terminals 6 on the wireless terminal storage unit 69 are subject to take-out detection. First, in step S30, it is checked whether the wireless terminal 6 to be taken out and detected is set in the wireless terminal storage recess 137. If it is set, proceed to step S31 and check if the extension number has been entered. If there is an input, proceed to step S32 and echo back. If the extension number is not entered in step S31, step S32 is skipped.

【0042】

If the wireless terminal 6 is not set in step S30, the process proceeds to step S39, the abnormality notification buzzer 141 is sounded, and the wireless terminal 6 is set in step S40. Then, after confirming that the wireless terminal 6 has been returned, the process ends. If the extension number is set normally, the wireless terminal 6 for which the extension number is set in step S38 is excluded from the target of the carry-out detection in step S30.

【0043】

As shown above, if the wireless terminal 6 other than the wireless terminal 6 for which the extension number is normally set is taken out, the abnormality notification buzzer 141 sounds, so that it can be understood that the user has taken it out by mistake.

【0044】

[Example 5] FIG. 5 is a block diagram showing a configuration of a fifth embodiment of the private branch exchange system according to the present invention, and corresponds to claim 5. FIG. 11 is an external view of the wireless terminal storage unit 90 in the same embodiment. In this embodiment, the movable protrusion 156 for locking the wireless terminal shown in FIG. 11 is not required.

【0045】

Regarding the operation when the wireless terminal 85 is taken out, except that the operation and display control commands on the wireless terminal are exchanged between the wireless terminal 85 and the wireless terminal storage unit 91 via the data exchange electrode 158. Then, the same operation as in the fourth embodiment is performed. In this embodiment, replacing step S37 in FIG. 16 with the flowchart of FIG. 14 is the same as in the second embodiment.

【0046】

[Example 6] FIG. 6 is a block diagram showing a configuration of a sixth embodiment of the private branch exchange system according to the present invention, and corresponds to claim 6. In this embodiment, the operation when the wireless terminal 105 is taken out is basically the same as in the first, third, and fourth embodiments. However, when the wireless terminal 105 is returned, it is necessary to take correspondence between the extension number and the original wired terminal, so it is necessary to save the I / F number of the wired terminal. For example, in the case of the same configuration as in the first embodiment, the management table of the extension terminal management unit 109 is as shown in FIG. 18, and in step S8, after copying the extension I / F number of the wired terminal to the storage number field, Change the I / F number Set the terminal number. The results are shown in FIG.

【0047】

Next, the operation when the wireless terminal 105 is returned to the wireless terminal storage unit 107 will be described with reference to the flowchart of FIG. When it is detected in step S50 that the wireless terminal 105 has been returned to the wireless terminal storage recess 137 due to a change in the state of the microswitch 132, the process proceeds to step S51, and the storage number of the management table of the extension terminal management unit 109 for the returned position is reached. Copy the value in the column to the extension I / F number column and clear the terminal number column. As a result, the management table returns to the state before the terminal was taken out (Fig. 18), so that the correspondence between the extension number and the extension terminal is switched to the wired terminal thereafter.

【0048】

Since the terminal is identified by the returned position here, the shapes of the wireless terminal storage recesses 137 must all be different so that the wireless terminal 105 is not returned to the wrong position. When the data exchange electrode 136 is provided, when the wireless terminal 105 is returned to the wireless terminal storage recess 137, the extension number set in the wireless terminal 105 can be obtained via the data exchange electrode 136. Therefore, the extension I / F number column corresponding to the extension number may be rewritten. Therefore, the shape of the wireless terminal storage recess 137 does not have to be different.

【0049】

When the movable protrusion 133 for locking the wireless terminal is provided (corresponding to the third embodiment), following step 51, the movable protrusion 133 for locking the wireless terminal is taken out from the wall surface and meshed with the wedge-shaped recess 142 on the side surface of the wireless terminal 105. By doing so, the wireless terminal 105 is locked so that it cannot be taken out.

【0050】

Further, in the case of performing the abnormality notification as in the fourth embodiment, following step S51, the returned wireless terminal 105 is added to the target of the carry-out detection in step S30.

【0051】

Although the case where the wireless terminal storage unit and the wireless terminal have the configuration shown in FIG. 7 has been described here, the same applies to the case where the wireless terminal has the configuration shown in FIG.

【0052】

[Example 7] The seventh embodiment of the private branch exchange system according to the present invention corresponds to claim 7. In this embodiment, the same as in Examples 1 to 6 except that the same extension I / F number may appear more than once on the management table. An example of the management table of the extension terminal management unit 8 before the execution of step S8 is shown in FIG. 20, and an example after the execution is shown in FIG. 21. Here, the extension number is used like an individual number.

【0053】

In the above embodiment, an example of using a micro switch as a terminal storage state confirmation means has been shown, but when the wireless terminal storage unit is provided with a charging circuit, the storage state of the wireless terminal is checked by opening / closing the charging circuit. It is also possible to know.

【0054】

[Effect of the invention]

As described above, the present invention has the following effects. (1) Since you can usually use your own wired terminal, operability does not deteriorate. (2) You can switch to a wireless terminal and use it only when necessary, and since the switching between a wireless terminal and a wired terminal is not fixed, you can effectively use the wireless terminal. (3) When you take out a wireless terminal, you will not take it out without setting an extension number by mistake. (4) When switching from a wireless terminal to a wired terminal, you only have to put the wireless terminal back in without any troublesome operation. (5) Even if one of the members who share the wired terminal takes out the wireless terminal, the remaining members can use the wired terminal as it is. (6) By diverting the operation unit of the wireless terminal for setting the extension number, the hardware of the wireless terminal storage unit can be reduced.

[Simple explanation of drawings]

[Figure 1]

It is a block diagram which shows the structure of 1st Example of the PBX system which concerns on this invention.

[Figure 2]

It is a block diagram which shows the structure of the 2nd Example of the PBX system which concerns on this invention.

[Fig. 3]

It is a block diagram which shows the structure of 3rd Example of the PBX system which concerns on this invention.

[Fig. 4]

It is a block diagram which shows the structure of 4th Example of the PBX system which concerns on this invention.

[Fig. 5]

It is a block diagram which shows the structure of 5th Example of the PBX system which concerns on this invention.

[Fig. 6]

It is a block diagram which shows the structure of the 6th Example of the PBX system which concerns on this invention.

[Fig. 7]

This is an example of an external view of the wireless terminal storage unit according to the present invention.

[Fig. 8]

It is a flowchart of extension terminal management in the PBX system of 1st Example.

[Fig. 9]

This is an example of the management table of the extension terminal management unit 8 in the PBX system according to the present invention, which is an example of a state in which an extension number is assigned to a wired terminal.

[Fig. 10]

This is an example of the management table of the extension terminal management unit 8 in the PBX system according to the present invention, and is an example of a state in which a part of the extension number is assigned to the wireless terminal.

[Fig. 11]

This is the second example of the wireless terminal storage unit and the external view of the wireless terminal according to the present invention.

[Fig. 12]

This is an example of the management table of the extension terminal management unit 28 in the PBX system according to the present invention, which is an example of a state in which an extension number is assigned to a wired terminal.

[Fig. 13]

This is an example of the management table of the extension terminal management unit 28 in the PBX system according to the present invention, and is an example of a state in which a part of the extension number is assigned to the wireless terminal.

[Fig. 14]

It is a part of the flowchart of extension terminal management in the PBX system of the second embodiment and the fourth embodiment.

[Fig. 15]

It is a part of the flowchart of extension terminal management in the PBX system of the third embodiment.

[Fig. 16]

It is a part of the flowchart of extension terminal management in the PBX system of the 4th embodiment and the 5th embodiment.

[Fig. 17]

This is a part of the flowchart of extension terminal management in the PBX system of the sixth embodiment.

[Fig. 18]

This is an example of the management table of the extension terminal management unit 8 in the PBX system of the sixth embodiment, which is an example of a state in which an extension number is assigned to a wired terminal.

[Fig. 19]

This is an example of the management table of the extension terminal management unit 8 in the PBX system of the sixth embodiment, which is an example of a state in which a part of the extension number is assigned to the wireless terminal.

[Fig. 20]

This is an example of the management table of the extension terminal management unit 8 in the PBX system of the sixth embodiment, which is an example of a state in which a plurality of extension numbers are assigned to one wired terminal.

[Fig. 21]

This is an example of the management table of the extension terminal management unit 8 in the PBX system of the sixth embodiment, which is an example of a state in which a part of the extension number is assigned to the wireless terminal.

[Fig. 22]

It is a block diagram of a conventional PBX system.

[Explanation of symbols]

1 Extension I / F for wired terminals 2 Wired terminal 3 External line I / F 4 Exchange processing unit 5 Extension I / F for wireless terminals 6 Wireless terminal 7 Call control unit 8 Extension terminal management department 9 Wireless terminal storage 10 Extension number setting section 11 Terminal storage status detector