JP2798574B2 - Sub address dial-in control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for receiving a call from an external calling terminal to a called terminal accommodated in a private branch exchange.
The present invention relates to a subaddress dial-in control method for connecting an identification code of a called terminal device as a destination subaddress in a call setup message.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional sub-address dial-in control method disclosed in, for example, Japanese Patent Application Laid-Open No. 2-158255. In FIG. 1, reference numeral 1 denotes an exchange network including an integrated service digital network (hereinafter, referred to as ISDN) exchange, and reference numeral 2 denotes an ISDN terminal device as a calling terminal device accommodated in the exchange network 1. Reference numeral 3 denotes a private branch exchange having a dial-in function accommodated in the exchange network 1. Reference numeral 4 denotes an ISDN terminal device accommodated in the private branch exchange 3 as a called terminal device. 5a,
5b is an IS connecting the private branch exchange 3 to the switching network 1.
In the case of a DN office line, these are collectively referred to as 5
Is used.

In the private branch exchange 3, a network 10 performs switching such as call setting.
A control unit 1 controls the network 10.
Further, in this control unit, 12 is a message analysis unit for analyzing a message such as a call setting message or a release request message, 13 is a dial digit judging unit for judging a dial digit in the message, and 14 is a dial digit judging unit. It is a call control unit that performs control. Reference numerals 15a and 15b denote trunks connected to the switching network 1 via the ISDN central office lines 5a or 5b.

Next, the operation will be described. Here, the switching network 1 accommodates various private branch exchanges (not shown) and various terminal devices including the ISDN terminal device 2, and the network 10 of the private branch exchange 3 includes an ISDN terminal device 4.
Are accommodated. For example,
When a call is sent from the ISDN terminal device 2 to the ISDN terminal device 4 using the dial-in function of the private branch exchange 3, the destination subaddress in the call setup message can be used as the dial-in number.

In this case, a call arrives at the trunk 15a from the switching network 1 via, for example, the ISDN office line 5a, and the call setting message is transferred to the control unit 11. In the control unit 11 of the private branch exchange 3, the type and the like of the received message are analyzed by the message analysis unit 12, and in the case of the call setup message, the called subaddress in the message is transferred to the dialed digit determination unit 13 and the dialed number is determined. A judgment such as an in-number is performed. The determination result is notified to the call control unit 14 and the call control unit 1 is notified.
In response to the control of the ISDN terminal 4 on the extension side, the trunk 15 receiving the call from the ISDN terminal 2 on the originating side receives a response from the ISDN terminal 4.
Control of the path on the network 10 between the server and the server.

In the conventional private branch exchange, the same I
The service provided when arriving via the SDN station line 5 is the same regardless of the type of the external ISDN terminal device 2 and the like. A method is adopted in which a data conversion algorithm is assigned to each
The secret communication service is executed in accordance with the data conversion algorithm corresponding to 5.

[0007]

Since the conventional sub-address dial-in control method is configured as described above, the data conversion algorithm of the private communication service is set corresponding to the trunk 15 for incoming calls. The number of trunks 15 for incoming calls that can provide a confidential communication service by the data conversion algorithm of the above is limited, and the use efficiency of the trunks 15 for incoming calls is reduced, and it is not easy to change the service to be provided. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to set the type of service to be provided to an external terminal device using a dial-in function for each caller. It is an object of the present invention to obtain a sub-address dial-in control method which can easily select the sub-address dial-in.

[0009]

A subaddress dial-in control method according to the present invention includes a security code and a sound.
While registering the correspondence of the voice coding system, the calling terminal device
Sends a call setup message, the call setup message
The private branch exchange sends the security code
Finds security code and corresponding audio coding method
It is something to do.

[0010]

When the private branch exchange according to the present invention receives a call setup message from the calling terminal device, it sets a call setup message.
Using the security code in the di, the corresponding security code and speech coding is to search for table registered, by executing the speech coding method that has been extracted, the type of speech coding scheme to provide A sub address dial-in control method that can be set for each calling terminal device and that can be easily selected is realized.

[0011]

[Embodiment 1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG.
FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a switching network, 2 is an ISDN as a calling terminal device.
3 is a private branch exchange, 4 is an ISDN terminal device as a called terminal device, 5 is an ISDN office line, 10 is a network, 11 is a control unit, 12 is a message analysis unit, 13 is a dialed number judgment unit, and 14 is a dial number determination unit. call control unit, 15 is a trunk, identical to those of the prior art in which the same reference numerals in FIG. 2,
Or, since it is a substantial part, detailed description is omitted.

Reference numeral 16 denotes a storage unit in the control unit 11, and reference numerals 19 and 20 are set in the storage unit 16 as a table in which the correspondence between the security code and the audio coding method for communication data is registered. 3 is a security code table and a speech coding method table. According to the illustrated example, three types of sounds are stored in the security code table 19.
Voice coding system identifiers “1” to “3” and three types of security codes “1111” to “333” each having four digits
3 ”is registered, and the audio coding scheme
Table 20 includes the audio coding scheme identifiers “1” to
Corresponding to "3", three types of voice code for communication data
Encoding schemes "A", "B", and "C" are registered. What
Note that, for example, ISDN 64 kbp
There are sPCM and PHS32kbps ADPCM.

Next, the operation will be described. Private branch exchange 3
Of the ISDN terminal device 4 accommodated in the private branch exchange 3 connected to the switching network 1 in which the private branch exchange 3 is accommodated.
When a call is originated from the DN terminal device 2 using the dial-in function of the private branch exchange 3, the ISDN terminal device 2 adds the ISDN such as the dial-in number to the destination subaddress in the call setup message as in the conventional case. Terminal device 4
Is set and transmitted. At that time, the ISDN terminal device 2 transmits a call setup message to select the voice coding system provided by the private branch exchange 3.
Send it with the security code inside. Specifically
Is to add, for example, a four-digit security code before the destination sub-address and send it out.

The private branch exchange 3 is connected to the ISDN
The message received by the trunk 15 via the N station line 5 is analyzed by the message analysis unit 12 of the control unit 11. As a result of the analysis, if the message type is identified as a call setup message, the presence / absence of a called subaddress is determined. If the message has a called subaddress, the security code added before the called subaddress by the dial digit determining unit 13 is determined. Security code table 1 using
9 and extracts the associated speech coding scheme identifier .

Further, the service request content is identified by the destination subaddress, and the security code table 1 is identified.
Speech using a speech encoding method identifier obtained by the search of 9
Referring to the encoding method table 20 , the audio code to be used is
It determines the encryption scheme and notifies the call control unit 14 of the result of the determination. For example, if the additional security code prior to subaddress is "1111", is extracted speech coding identifier "1" by searching the security code table 19, based on the speech encoding method identifier "1" The voice coding scheme “A” determined in the voice coding scheme table 20 referred to above is sent to the call control unit 14,
The call control unit 14 performs communication according to the voice coding method “A”.
Encodes voice data to improve the economic efficiency of communications.
And

Note that the number of digits of the security code and the number of digits of the destination sub-address can of course be changed in accordance with the number of terminal devices accommodated in the private branch exchange 3, the number of voice coding systems , and the like. .

[0017]

As is evident from the foregoing description, according to the present invention, cough
The correspondence between the security code and the audio coding method
On the other hand, when the calling terminal device sends a call setup message,
Include the security code in the call setup message
The private branch exchange sends the security code and the corresponding sound.
Since the voice coding system is configured to be searched, it is possible to provide an economically efficient communication service only to the caller whose security code is known, and to specify the type of the voice coding system to be provided. It is set for each of the calling terminal device
And the type of audio coding scheme to be provided.
There is an effect that the type can be easily changed .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a subaddress dial-in control method according to Embodiment 1 of the present invention.

FIG. 2 shows a conventional sub-address dial-in control method.
FIG.

[Explanation of symbols]

 Reference Signs List 1 switching network 2 calling terminal equipment (ISDN terminal equipment) 3 private branch exchange 4 called terminal equipment (ISDN terminal equipment) 19 table (security code table) 20 table (speech coding method table)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04Q 3/58 H04M 3/42

Claims (1)

(57) [Claims] 1. A calling terminal connected to a switching network accommodating a private branch exchange, using an identification code of a called terminal device accommodated in a private branch exchange having a dial-in function as a destination subaddress in a call setup message. In the subaddress dial-in control method for connecting a call from a call terminal device to the called terminal device, the private branch exchange is provided with a table in which a correspondence between a security code and a voice coding method for communication data is registered, and The call terminal sends a call setup message
Message is sent, the security is included in the call setup message.
The private branch exchange receives the call setup message when the private branch exchange receives the call setup message.
Perform a search of the table using the security code in the communication associated with the security code
A sub-address dial-in control method, characterized by executing a voice coding method for transmission data .