JPH08336169A - Telephone system and method for controlling telephone - Google Patents

Abstract

PURPOSE: To store a relatively few ISDN lines, to simultaneously make three calls or more and to easily extend the ISDN lines. CONSTITUTION: A cordless telephone slave set 20 is the one which is possible to be applied to a simple portable telephone system and performs radio communication with a cordless telephone master set 21. Each of the cordless telephone master set 21 has one S/T point interface which is applied in an ISDN basic interface. A control unit 22 having the S/T point interface of the number corresponding to the number of cordless telephone master sets 21 performs the control of making a speech path for the transmission request from the cordless telephone master set 21 and the incoming call request from an ISDN public network 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device and a telephone control method, and particularly to an ISD capable of making and receiving an outside line and making an extension line call.
The present invention relates to a cordless telephone device using an N basic interface and a telephone control method.

[0002]

2. Description of the Related Art FIG. 20 shows a wired telephone system as a conventional example. A plurality of telephones 10a, 10b, 10c are connected to the private branch exchange 11 as extension terminals, and a public network 12 is connected via an interface point 13. In such a system, the private branch exchange 11 controls outgoing, incoming, and transfer of external lines and internal lines of the telephones 10a, 10b, and 10c. The public network 12 is a PSTN (Public S
ISDN (Integrat)
ed Services Digital Network).

In the ISDN basic interface, two telephone channels (B channel) and one control channel (D channel) can be secured by one telephone line. As shown in FIG. 21, a plurality of telephones 10a, 10b, 10
c and 10d are connected by the bus 14, and the bus 14 is connected to the DSU (Di
gital service unit: network termination device) 15 through ISD
By connecting to N12a, two telephones 10 can be used simultaneously by one ISDN line.

Explaining the operation in such a system, when the telephones 10a, 10b, 10c make an outside line call through the public network 12, the private branch exchange 11 selects a telephone line that is not currently used and uses that line. Form a communication link. In the case of an incoming call, the private branch exchange 1
By grouping the telephones 10 accommodated in No. 1 in advance, it is possible to select a group of telephones 10a, 10b, 10c to receive the incoming call.

In general, when the private branch exchange 11 is a large-scale system that collectively performs call control of several tens of lines and the processing is complicated, a normal interface (subscriber interface) is used as the interface 13 with the public network 12. , Which is different from, can be used to form a network with a high degree of freedom.

[0006]

However, in the case where the private branch exchange 11 performs call control of several tens of lines collectively and the processing is complicated, for a user who needs several tens of lines. Convenient, but redundant for users who only need a few lines, such as a few lines,
There is a problem that it becomes expensive.

In addition, in the configuration that accommodates the ISDN line,
There is a problem in that only two telephones 10 can be used simultaneously by one ISDN circuit and three or more calls cannot be processed at the same time.

Further, when the ISDN basic interface is used, since telephones are connected by the bus 14, there is a problem that extension calls cannot be performed between different telephones connected to the bus.

In view of the above conventional problems, the present invention is capable of accommodating a relatively small number of ISDN lines and processing three or more calls at the same time, and a telephone device and a telephone capable of easily adding ISDN lines. The purpose is to provide a control method.

[0010]

According to a first aspect of the present invention, there is provided a telephone device for wireless communication between a plurality of telephone cordless handsets for making a call and at least one telephone cordless handset, and has one interface. It is characterized in that it is provided with a plurality of telephone masters and a control unit having the same number of different interfaces as the number of telephone masters and controlling each of the telephone masters via the interfaces.

According to another aspect of the present invention, there is provided a telephone device for wireless communication between a plurality of telephone slave units for making a call and at least one telephone slave unit and a plurality of telephone master units having one interface. Among the plurality of control channels of the interface of the telephone master set, the first control channel is used for outside call control, and the second control channel is used for extension / incoming call.

According to a twelfth aspect of the present invention, in the telephone control method, wireless communication is performed between at least one telephone slave unit and a plurality of telephone master units having one interface, and the number of telephone master units of the control unit is set. It is characterized by controlling the telephone main unit via the same number of different interfaces as the above.

According to another aspect of the present invention, there is provided a telephone control method, wherein wireless communication is performed between at least one telephone slave unit and a plurality of telephone master units having one interface to control a plurality of telephone master unit interfaces. Among the channels, the first control channel is used to perform outside call control, and the second control channel is used to perform extension / incoming call.

[0014]

In the telephone device according to the first aspect of the present invention, the control unit has the same number of different interfaces as the number of telephone master units, and controls the respective telephone master units via the interfaces.

In the telephone device according to the eleventh aspect, of the plurality of control channels of the interface of the telephone master set, the first control channel is used for outside call control and the second control channel is used for extension / incoming call. .

According to the twelfth aspect of the telephone control method of the present invention, the telephone master units are controlled through the same number of different interfaces as the number of telephone master units of the control unit.

In the telephone control method according to the thirteenth aspect, outbound call control is performed using the first control channel among the plurality of control channels of the interface of the telephone master set, and the extension control is performed using the second control channel. Calls are made.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a cordless telephone device according to the present invention.

The system shown in FIG. 1 shows, as an example, a system accommodating two ISDN lines 24a and 24b, and a plurality of cordless telephone handsets 20 (20-1, 20-).
2 to 20-n) and two cordless telephone base units 21
(21a, 21b) and one control unit 2
2 The control unit 22 is connected to the ISDN public network 23 via an interface 24, and the interface 24 is composed of two ISDN lines 24a and 24b. Here, one I of the ISDN public network 23
The basic interface structure of the SDN line is composed of 2 × communication channel (2B channel) + control channel (D channel) channels (B = 64 kbps, D = 16 kbps).

The cordless telephone slave unit 20 is applicable to a simple portable telephone system and performs wireless communication with the cordless telephone master unit 21. Cordless telephone base unit 21
Each of them has one S / T point interface to which the ISDN basic interface is applied, and the control unit 22 responds to the call request from the cordless telephone master station 21 and the call request from the ISDN public network 23. Control such as formation of

As shown in detail in FIG. 2, the control unit 22 accommodates the ISDN lines 24a and 24b.
One DSU (Network Termination Unit) 40a, 40b and a Dynamic Data Allocation Unit (DDAU)
41, two S / T point interface parts (interfaces capable of connecting both the S point interface and the T point interface) 42a and 42b, and two connectors 43
a and 43b. DSU 40a, 40b is ISDN
Controlling the interface between the public network 23 and the subscriber (cordless telephone slave unit 20), the DDAU 41 performs call control of external lines and internal lines and formation of a communication path. The S / T point interface units 42a and 42b have the layer 1 function defined in the ISDN basic interface, and the connector 43
a and 43b are cordless telephone base units 21a and 2 respectively.
1b is physically connected.

Next, (1) outside call, (2) outside call,
Each process of (3) extension / incoming call and (4) transfer will be described.

(1) Outside line transmission First, the operation at the time of outside line transmission will be described with reference to FIGS. First, in step 501, a cordless telephone slave unit 20 (hereinafter, referred to as a slave unit A) that makes an external call forms a wireless link with the nearest cordless telephone master unit 21. This communication process complies with RCR-STD28 (standard of the Radio System Development Center). More specifically, first, the slave device A transmits a link channel establishment message to the master device 21, and the master device 21 transmits a link channel allocation message to the slave device A. In addition, the master unit 21 transmits a synchronization burst signal to the slave unit A, and the slave unit A transmits a synchronization burst signal and a SABM (Set Asynchronous Balanced Mode) message to the master unit 21. The device 21 transmits a UA (Unnumbered Acknowledge) message to the child device A.

When the wireless link is established in this manner, the slave unit A transmits a call setting message to the master unit 21 in the following step 502, and the master unit 21 controls the control unit (CU) 22 in the following step 503. A call setup message according to DSS1 (subscriber line transmission method) to CU2
2 selects a free ISDN line to the network 23 and transmits a call setup message using the D channel of the line. In this case, if all the lines are in use, the CU 22 does not send a call setup message to the network 23, but sends a disconnection message to the master device 21 and suspends communication control.

In the following step 505, the network 23 sets the CU 22.
To the base unit 21, the CU 22 transmits a call setting acceptance message to the parent device 21 in step 506. At this time, which B channel to use is transmitted using user-user data (UUD) (described later with reference to FIG. 5). Here, as shown in FIG. 4, the public network 23 and the CU 22 are
The interface with is 2B in each ISDN line.
(64 * 2kbps) (B1 and B2 or B3 and B4) + D
Although a channel is used, 32 kbps is used as a communication channel between the base unit 21 and the UC 22. Therefore, 4B '(32 * 4kbps) (B'1, B'2, B', which is different from the B channel of the normal S / T point interface)
3, B'4) + D channel is used to control which B'channel of this 4B 'channel the call is made on.

In this case, although the actual number of D channels is 2, one is used for the cordless telephone 21a and the other one is used for the cordless telephone 21b. Therefore, when viewed from each cordless telephone, the D channel is 1
It becomes an individual.

The format of the UUD is, as shown in FIG. 5, a flag field F1, a user / user content length field F2, a user-specific protocol or ASN. 1
A field F3, a 1-bit source and a 7-bit allocation request / instruction / confirmation field F4, and an allocation channel field F5 are used. By the allocation channel field F5, 4B 'channels (B'1 to B'shown in FIG. 4 are shown.
One of 4) is specified.

Returning to FIG. 3, steps 507-5 are then performed.
14 processes are performed according to the normal DSS1 and RCR-STD28. More specifically, in step 507, the parent device 21 transmits a call setting acceptance message to the child device A, and in the following step 508, the network 23 sends the CU2.
2, the CU 22 sends a call message to the base unit 21 in the following step 509, and the base unit 21 sends a call message to the handset A in the following step 510 (or RBT (ringback tone in step 511). )) Is sent.

Next, when the outside line receiving side responds, the network 23 sends a response message to the CU 22 in step 512, and the CU 22 sends the response message to the CU 22 in step 513.
1, the master unit 21 transmits a reply message to the slave unit A in the following step 514, and the communication path is formed in step 515.

(2) External line incoming call Next, the operation upon external line incoming call will be described with reference to FIG. FIG. 6 shows a case where a wireless link is formed between one of the two base units 21 (base unit 1) and the base unit A. RCR-STD28
The wireless link is formed based on First, step 7
In 01, the network 23 sends a call setup message to the CU 22, the CU 22 sends a call setup message to the two masters 1 and 2 in step 701a, and the two masters 1 and 2 respectively in step 701b. An incoming call message is transmitted to a plurality of slave units 20 belonging to itself.

Here, in a general large-scale indoor communication network, the position of the slave unit 20 (which slave unit belongs to which master unit) is registered to manage incoming calls. Location registration is not performed because there are two small-scale premises communication networks. However, a re-call type handover process defined by RCR-STD 28 (a process of continuing a call with another master unit when a slave unit in a call with a predetermined master unit moves via a wireless link) ) Does.

When the called number included in the incoming call message matches the own handset number, the handset receives the normal RCR-.
A wireless communication link is formed according to the processing of the STD 28.
After that, the processing up to the call is the same as in the case of the outside call, so the description thereof is omitted.

When only one telephone number is assigned as the system, a plurality of slave units 20 try to receive an incoming call at the same time, so that the master units 21 of the plurality of slave units 20 and the CU 22 of the two master units 21 are received. Receive request occurs.

Therefore, in order to prevent simultaneous access of a plurality of slave units 20 to one master unit 21, a radio identification call number is provided in the PCH (including the telephone number of the telephone set to receive the call) in the incoming call message. As it is, step 70
It is set in the radio link channel establishment request message generated in 2. Based on the wireless identification call number in this message, the base unit 21 is a response to the simultaneous incoming call, or a normal incoming call (when the extension or external line is transmitted from the child device) (in such a case, the wireless identification call number is included. It is determined in the wireless link formation stage whether or not it is a response to a wireless communication link establishment process, a wireless communication link establishment process is performed to give a communication right to the first accessed slave device A, and a wireless link with the subsequently accessed slave device 20 is established. Not established.

Even if such processing is performed, the CU2
There are cases where two master devices 21 simultaneously access two devices. In this case, the communication right is given to the master device 21 that first sent the call setting acceptance message on the principle of "first come first served". The base unit 21 that sent the call setting acceptance message next
A disconnection message is transmitted to (step 715) and the communication path is not formed. Therefore, the CU 22 uses the public network 23.
When a call having the same call number is accessed, the priority is given to the parent device that accessed first.

Of course, such simultaneous access from the base units does not occur if a telephone number is given to each base unit 21.

The communication sequence when a wireless link is formed between the master unit 1 and the slave unit A will be described. First, in step 702, as in the case of the outside line transmission shown in FIG. Link channel establishment message, link channel assignment message, synchronization burst signal, SABM
Exchange messages and UA messages. Next, in step 703, the slave unit A transmits an incoming call response message to the master unit 1, and in subsequent step 704, the master unit 1 transmits a call setting message to the slave unit A.

Next, the handset A sends a call setting acceptance message to the base unit 1 (step 705), and the base unit 1 sends a C message.
For U22 (step 706), the CU22 makes the network 23
To the base unit 1 (step 708), and then the handset A sends a call message to the base unit 1 (step 708).
Further, the main unit 1 sends the CU 22 (step 709),
The CU 22 transmits to the network 23 (step 710),
Then, when the child device A responds, a response message is sent to the child device A.
To the master unit 1 (step 711), the master unit 1 to the CU 22 (step 712), and the CU 22 to the network 2
3 (step 713) and step 714
A call path is formed at.

(3) Extension / Reception of Extensions Next, the operation at the time of extension / reception of extensions will be described with reference to FIG. FIG. 7 shows a case where a wireless communication link is formed between the calling side child device A-the calling side parent device A-CU22-the called side parent device B-the called side child device B based on the RCR-STD 28.
Similar to the case of the foreign call transmission shown in FIG. 3, in step 901, the call is made between the originating side slave unit A and the master unit A (master unit A).
A radio link is formed by exchanging a link channel establishment message, a link channel assignment message, a synchronization burst signal, a SABM message, and a UA message using the D channel of the interface.

Then, in step 902, the handset A transmits an extension call setup message to the master A, instead of the call setup message at the time of outgoing call shown in FIG. This is to prevent the communication path establishing process from the CU 22 to the network 23.

When the base unit A transmits the extension call setting message to the CU 22 in the following step 903, and the CU 22 transmits to the destination base unit B in the following step 904, the base unit B transmits the following step 905. D
At step 906, the CU 22 receives the extension call setup message from the base unit A while transmitting an incoming call message to the handset unit B via the channel, and returns the extension call setup message to the base unit A in step 906 ( However, this can be omitted), in the following step 907, the master unit A transmits an incoming call message to the slave unit A via the D channel.

Next, between the master device B and the slave device B on the receiving side, the link channel establishment message and the link channel allocation message are similarly used in step 908 using the D channel of the interface of the (master device B). , A synchronization burst signal, a SABM message, and a UA message are exchanged to form a wireless link. Next, in step 909, the child device B transmits an incoming call response message to the parent device B, and in the following step 910, the parent device B sends an extension call setup message to the child device B.

Next, the slave unit B transmits an extension call setting acceptance message to the master unit B (step 911).
The base unit B sends the CU22 to the CU22 (step 912).
2 transmits to the master A (step 913), and the master A transmits to the slave A (step 914). Next, the child device B sends a call message to the parent device B (step 915), the parent device B sends an extension calling message to the CU 22 (step 916), and the CU 22 sends it to the parent device A. Send an extension call message (step 91
7), the master A sends a call message or RB to the slave A
T is transmitted (steps 918 and 919).

Next, when the child device B responds, the child device B transmits a response message to the parent device B (step 92).
0), the base unit B transmits an extension response message to the CU 22 (step 921), the CU 22 transmits an extension response message to the base unit A (step 922),
The master unit A transmits a response message to the slave unit A (step 923), and the communication channel between the slave units A and B is set (step 924). This call channel is set by the assigned channel field F5 in the UUD format shown in FIG.

In this way, the originating master unit A and the slave unit A are connected via the D channel of the S / T point interface 42a, and the receiving master unit B and the slave unit B are connected. S /
Since the connection is made by using the D channel of the T-point interface 42b, it becomes possible to make an extension call between the slave units A and B accommodated in different master units. When the child device B exists in the same parent device A as the child device A, the processes after step 912 in FIG. 7 are performed via the D channel of the S / T point interface 42a of the parent device A. By that,
It enables extension calls (this is the same as the conventional case).

(4) Transfer Next, the transfer operation will be described with reference to FIG. FIG. 8 shows a case in which a child device A in a call via the parent device A transfers to the child device B via the same parent device A. First, in step 1001, the transfer source slave device A transmits a hold message to the master device A, and in step 1002, the master device A transmits a hold tone to the other party (external line) who is talking. Next, in step 1003, the child device A is the parent device A.
A transfer request message including the extension number of the transfer destination to the master device A in step 1004.
2 transmits a transfer request message. Next, in step 1005, the CU 22 checks the congestion state of the wired side call path, and then transmits a transfer confirmation message to the base unit A when the call path is free, and the subsequent step 100
In 6, the parent device A sends a transfer confirmation message to the child device A.

Next, in step 1007, the parent device A
Transmits a disconnection message to the handset A, the handset A sends a release message to the base A in the following step 1008, and the handset A sends a release completion message to the handset A in the following step 1009. To send. Here, in step 1010, the parent device A may send a DISC message to the child device A, and the child device A may send a UA message to the parent device A in the subsequent step 1011. Next, in step 1012, the parent device A transmits a wireless channel disconnection message to the child device A, and in the following step 1013, the child device A transmits a wireless channel disconnection complete message to the parent device A, so that the parent device The wireless link between A and the handset A is disconnected.

Next, steps 1014A and 1014B
2, the CU 22 transmits a transfer call setting message to the base units A and B via the S / T point interface units 42a and 42b shown in FIG. 2, and receives the transfer call setting message. Step 1015 followed by
In A and 1015B, the transfer incoming call message is transmitted. Similarly, this transfer incoming call message is a modification of the PCH, and may be, for example, one in which “110” is coded as the call service type indicating the expression format of the telephone number.

FIG. 8 shows a case where there is a response from the child device B to the parent device A, and there is no response to the parent device B within a predetermined time and the time-out occurs. In this case, the parent device B performs the disconnection process in step 1030, and
In 031, a disconnection message is transmitted to the CU 22.

FIG. 8 shows an example of transfer within the same master unit A, but the communication process is the same between the different master units except that the control channels are different.

Between the parent device A and the child device B, the child device B first transmits a proxy link channel establishment request message to the parent device A in step 1016, and then in step 1
In 017, the parent device A transmits a proxy link channel assignment message to the child device B. Here, FIG. 3 and FIG.
The reason for using a message different from the normal radio link channel establishment request message as shown in FIG.
This is for managing the calls to be transferred.

Then, the synchronization burst signal (step 10
18, 1019), SABM message (step 10
20) and the UA message (step 1021) are exchanged, and then, in step 1022, the parent device A becomes the child device B.
To the master unit A, the slave unit B transmits a transfer call setting acceptance message to the master unit A in step 1023, and the master unit A accepts the transfer call setting acceptance to the CU 22 in subsequent step 1024. Send a message.

Then, in step 1025, the slave unit B
Responds by transmitting a response message to the base unit A, and in the following step 1026, the base unit A transmits a response message to the CU 22. Then, step 1027
In CU 22, the transfer completion message is transmitted to the base unit A, and in the subsequent step 1028, the base unit A transmits the transfer completion message to the base unit B, and the transfer from the base unit A to the base unit B is completed. In step 1029, the call between the transfer destination child device B and the held party can be performed.

As described above, when two ISDN lines are used, four calls can be simultaneously made.

Next, an example in which the system of the first embodiment is added will be described with reference to FIGS. 9 to 11. FIG. 9 shows a case where two ISDN lines are added to the system shown in FIG. 1, and this system includes a plurality of cordless telephone slave units 2.
0 (20-1, 20-2 to 20-n) and four cordless telephone base units (21a-1, 21b-1, 21a-).
2, 21b-2) and two control units 22
a, 22b, and control units 22a, 22
b are respectively connected to the masters (21a-1, 21b-1) and the masters (21a-2, 21b-2).

Further, the control unit 22a is connected to the public network 23 via the interface 24 composed of two ISDN lines 24a and 24b, and the control unit 22b has two ISDN lines 111.
They are connected via an interface 111 composed of a and 111b. Then, the control unit 22a,
As shown in FIG. 10, a CU interface 112 of 4B ′ + D channel for connecting to the other control unit is added to each of the 22b. This CU
The interface 112 is composed of an S / T point interface and performs call control with each other on the D channel.

According to such a configuration, for example, when making a call from an outside line, the CU 22a (CU1) manages a call request from the master units 21a-1 and 21b-1 managed by the CU 22a (CU1). The same processing as in FIG. 3 is performed when there is a free communication path, but when all the communication paths managed by itself are in use, the step 503a in FIG. 11 is performed.
CU to other CU22b (CU2) as shown in
When the call setup message is transmitted through the interface 112 and the communication path managed by the CU 22b is available, call processing for forming a communication path can be performed as shown in steps 505a, 508a and 512a. . Since the other processes shown in FIG. 11 are the same as those shown in FIG. 3, the same step numbers are given and detailed description thereof is omitted.

Further, in the case of an external line incoming, as in the case shown in FIG. 6, when the call setting (step 701 in FIG. 6) arrives from the network 23 to the CU 22a, for example, the CU 22a sends the CU.
22a, the call setup is sent not only to the master units 21a-1 and 21b-1 but also to the CU 22b using the D channel applied between the CU interfaces 112. Calls can be made by simultaneous incoming calls without location registration. The communication sequence in this case is not shown, but in FIG.
Only 2b is added. Therefore, S / T
The CU interface 112, which is an interface different from the point interfaces 42a and 42b, is connected to the CUs 22a and 2b.
The scale can be easily expanded only by adding to 2b.

Next, a second embodiment will be described with reference to FIGS. This system shows a case where each of the parent devices 21 has two S / T point interfaces in the system shown in FIG. The CU22 is shown in FIG.
As shown in 2, two DSUs 40a and 40b and a DD
The master unit 2 via the AU 41, connectors 43a and 43b for connecting the two master units 21a and 21b respectively, an expansion connector 44, and connectors 43a, 43b and 44
S / T point interface 45 (S / T1) that mainly makes and receives an outside line with each of the 1 and S that mainly makes and receives an extension line.
It has a / T point interface 46 (S / T2).

Further, in this system, as shown in FIG. 13, two 2B (64 * 2 kbps) + D channels are used on the network side of two lines, while 4B '(32 * 4) on the inside of the premises.
Two kbps) + D channels are used. 14 and 1
5, FIG. 16 and FIG. 17 are (1) outside line and (2), respectively.
The respective processes at the time of outside line incoming, (3) outgoing and incoming line, and (4) forwarding are shown and correspond to FIGS. 3, 6, 7, and 8 in the first embodiment.

At the time of making an outside line call shown in FIG. 14, the call setting (step 503) and the call setting acceptance (step 50) transmitted between the master unit and the CU 22 when the handset A makes an outside line call.
6), call (step 509), response (step 51)
Each processing of 3) is performed by the S / T point interface 45 (S / T
1). Since the other processes are the same as those shown in FIG. 3, the step numbers are given and the description thereof is omitted.

Further, when an outside line is received as shown in FIG.
Similarly, when the call arrives at the child device A, the call setting between the parent device and the CU 22 (step 701) and the call setting acceptance (step 7).
06), call (step 709), response (step 71)
Each processing of 2) is performed by the S / T point interface 45 (S / T
1).

On the other hand, at the time of making and receiving an extension call shown in FIG. 16, extension call setting between the originating master A and the CU 22 (step 903), extension call setting acceptance (step 913),
The extension call (step 917) and the extension response (step 922) are processed by the S / T point interface 45 (S / T).
T1), and on the other hand, the receiving master B and CU22
Extension call setup (step 904), extension call setup acceptance (step 912), extension call (step 91)
6), each processing of the extension response (step 921) is S / T
This is done via the point interface 46 (S / T2).

At the time of transfer shown in FIG. 17, a holding tone (step 1002) between the transfer side master unit A and the CU 22, a transfer request (step 1004), and a transfer confirmation (step 10).
05) each processing is S / T point interface 45 (S / T
1) on the other hand, on the other hand, transfer call setting (steps 1014A and 1014B) between the master units A and B and the CU 22, transfer call setting acceptance (step 1024), and response (step 1)
026), transfer completion (step 1027) and disconnection (step 1031) are performed by the S / T point interface 46.
(S / T2).

FIG. 18 shows the C in the case of adding two ISDN lines, as in the case shown in FIG. 9 in the first embodiment.
The structure of U22 is shown and the CU interface 112 is added like FIG. When an outside line is transmitted in such a configuration, as shown in FIG.
And call processing (step 503), call setting acceptance (step 506), call (step 509), and response (step 513) between the CU 22 and the CU 22 are performed via the S / T point interface 45 (S / T1). Be seen. Also two CUs
Call setup (step 503a), call setup acceptance (step 505a), call (step 508a), and response (step 512a) are performed via the CU interface 112.

When the number of ISDN lines (that is, the number of CUs) is left unchanged and only the base unit 21 is added, as shown in FIGS. 12 and 18, the expansion connector 43 is used.
The number of lines can be easily increased by connecting them to the cable via a cable, which is efficient for a user who needs, for example, 5 to 6 lines.

[0067]

As described above, according to the telephone device of the first aspect and the telephone control method of the twelfth aspect, the telephone master units are respectively provided through the same number of different interfaces as the number of telephone master units of the control unit. Since it is controlled, the circuit scale can be reduced and the cost can be reduced. Since the interface between the control unit and one telephone master unit and the interface between the control unit and another telephone master unit are different interfaces, extension calls can be made without going through the public network.

According to the eleventh aspect of the telephone device and the thirteenth aspect of the telephone control method, the outside line call control is performed by using the first control channel among the plurality of control channels of the interface of the telephone master set, Since the extension control is performed using the second control channel, the circuit scale can be reduced and the cost can be reduced. In addition, extension calls can be made without going through the public network.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a telephone device according to the present invention.

FIG. 2 is a block diagram showing the configuration of a control unit in FIG. 1 in detail.

FIG. 3 is an explanatory diagram showing a communication sequence when an outside line is originated.

FIG. 4 is an explanatory diagram showing communication channels on a network side and a premises side of the control unit of FIG.

5 is an explanatory diagram showing a format of user data for designating a call channel shown in FIG. 4; FIG.

FIG. 6 is an explanatory diagram showing a communication sequence when an external line is received.

FIG. 7 is an explanatory diagram showing a communication sequence at the time of making and receiving an extension call.

FIG. 8 is an explanatory diagram showing a communication sequence during transfer.

9 is a block diagram showing a configuration when the telephone device of FIG. 1 is added.

10 is a block diagram showing in detail a configuration of a control unit shown in FIG.

11 is an explanatory diagram showing a communication sequence at the time of making an outside line in FIG. 9. FIG.

FIG. 12 is a block diagram showing in detail a configuration of a control unit according to a second embodiment.

FIG. 13 is an explanatory diagram showing communication channels on the network side and the internal side of the control unit in the second embodiment.

FIG. 14 is an explanatory diagram showing a communication sequence when an outside line is originated in the second embodiment.

FIG. 15 is an explanatory diagram showing a communication sequence when an outside line is received in the second embodiment.

FIG. 16 is an explanatory diagram showing a communication sequence at the time of making and receiving an extension call in the second embodiment.

FIG. 17 is an explanatory diagram showing a communication sequence at the time of transfer in the second embodiment.

FIG. 18 is a block diagram showing in detail the configuration of a control unit when the telephone device of the second embodiment is added.

19 is an explanatory diagram showing a communication sequence at the time of making an outside line in FIG.

FIG. 20 is a block diagram showing a configuration of a conventional telephone device.

FIG. 21 is a block diagram showing the configuration of another conventional telephone device.

[Explanation of symbols]

20, 20-1 to 20-n Cordless Telephone Handsets 20, 21a, 21b, 21a-1, 21b-1, 21
a-2, 21b-2 cordless telephone master unit 22, 22a, 22b control unit (CU) 23 public network 24, 111 interface 24a, 24b, 111a, 111b ISDN line 40a, 40b DSU (network terminating device) 41 dynamic data Allocation unit (DDAU) 42a, 42b, 45, 46 S / T point interface unit 112 CU interface

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H04Q 3/42 H04B 7/26 109C

Claims (13)

[Claims] 1. A plurality of telephone slaves for making calls, a plurality of telephone masters having one interface for performing wireless communication between at least one of the telephone slaves, and the number of the telephone masters. And a control unit for controlling the telephone master unit via the interfaces, respectively. 2. The interface between the telephone master unit and the telephone slave unit is an S / T to which an ISDN basic interface is applied.
The telephone device according to claim 1, wherein the telephone device is a point interface, and the telephone master unit and the telephone slave unit form a cordless telephone. 3. The telephone device according to claim 2, wherein the telephone master set is provided in the same number as the number of ISDN basic interface subscription lines. 4. The control unit accommodates two ISDN basic interface subscriber lines and two cordless telephone base stations.
The telephone device described. 5. The telephone device according to claim 1, wherein a plurality of the control units are provided and each has an interface for communicating with each other. 6. The telephone device according to claim 5, wherein the interface for communicating between the control units is different from the interface for communicating between the control unit and the telephone master unit. 7. The call channel of the ISDN basic interface is 64 kbps, and two call channels of 32 kbps are allocated between the control unit and the telephone base unit, respectively. Telephone device. 8. The telephone device according to claim 3, wherein a call channel between the control unit and the telephone base unit is assigned by user user data. 9. The telephone device according to claim 1, wherein a wireless identification call number is transmitted to the telephone subunit. 10. The cordless telephone device according to claim 3, wherein information regarding transfer or extension is exchanged between the control unit and the telephone master unit, and between the telephone master unit and the telephone slave unit. 11. A plurality of telephone slaves for making a call, a plurality of telephone masters having one interface for performing wireless communication between at least one of the telephone slaves, and an interface of the telephone masters. Of the plurality of control channels, the first control channel is used for outside call control, and the second control channel is used for extension / incoming call. 12. A wireless communication is performed between at least one telephone slave unit and a plurality of telephone master units having one interface, and the control unit is provided with the same number of different interfaces as the number of the telephone master units. A telephone control method comprising controlling the telephone master unit, respectively. 13. Wireless communication is performed between at least one telephone slave unit and a plurality of telephone master units having one interface, and a first control among a plurality of control channels of the interface of the telephone master unit. A telephone control method characterized in that an external call control is performed using a channel, and an extension call is made and received using a second control channel.