JPS62248340A - Packet switching service system - Google Patents

Abstract

PURPOSE:To enable respective switching device to perform a connection with an incoming call terminal equipment without being conscious of whether the connection should be performed through a communication processor or not, by designating the switching device and the communication processor as the transfer opposite of a connection request packet by an switching managing device. CONSTITUTION:A switching device 2a, when receiving a connection request signal from a terminal equipment 1a, refers a station subscriber table 8, and when no corresponding subscriber number is present, it transmits an inquiry packet in which the subscriber number is set at an additional data field, to a switching managing device 3. The switching managing device 3 refers an all subscriber table 13, and returns a corresponding communication processing address, the physical address of the switching device corresponding to an incoming call subscriber number, and the physical address of a terminal equipment accommodating position, to the device 2a. Therefore, it is possible to perform a centralized processing in the switching managing device, regarding whether the communication should be performed via the communication processor on the basis of the attribute of an outgoing call terminal equipment or not.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention comprises a plurality of switching devices and switching management devices connected to a trunk line, and a plurality of switching devices connected to an AC device. This invention relates to an improved nogkerato exchange system.

[Conventional technology]

Regarding the improvement of the packet switching system as mentioned above,
The applicant for the invention of this application previously filed a patent application filed in 1986-59.
The proposal was made as No. 238. FIG. 9 is a block diagram showing an example of a conventional switching system. In the figure,
la, lb, and lc are terminal devices, 2a and 2b are switching devices, 3 is a switching management device, and 4 is a ring-shaped trunk line.

Further, FIG. 10 is a diagram showing an example of a sequence of signals and packets among the terminal device, the switching device, and the switching management device in the switching system of FIG. 9.

In this example, the terminal device 1a connected to the exchange device 2a
shows the sequence of signals and packets when a connection is requested to the terminal device 1b connected to the switching device 2b. In the figure, 21 is a connection request signal, 22
is an inquiry packet, 23 is an inquiry response J get, 2
4 is a connection request packet, 25 is an incoming call signal, 26 is an incoming call response signal, 27 is a connection response packet, and 28 is a connection response signal.

Next, the sequence example shown in No. 101g above will be explained. First, a connection request signal 2 is sent from the terminal device lt1a.
1 is received by nine exchanges fcrjL2m checks whether the terminal 6&, which is the object of the connection request, is accommodated in the local station by referring to the table within the local station. the result,
If you find out that it is stored in your own station, you will receive an exchange bag (il).
2a transmits an inquiry packet 22 containing the called subscriber number to the switching management device 3. The exchange management device 3 that receives this inquiry packet 22 converts the called subscriber number into a terminal physical address by referring to a table in the exchange management device 3, and sends an inquiry response packet containing the terminal physical address. 23 to the switching device 2a. Exchange device 2a that received this inquiry response packet 23
sends a connection request packet 24 with the terminal physical address as the destination. The switching device 2b that received this connection request packet 24 knows from the terminal physical address shown in the packet that the connection request is addressed to the terminal device lb, and sends an incoming call signal 25 to the terminal device 1b. . From then on, first, the terminal device 1b sends an incoming call response signal 26 to the switch II & device 2b, then the connection response socket 27 is sent from the switching device 2b to the switching device 2a, and finally, the terminal device ji2a sends a call response signal 26 from the terminal device 1b to the switching device 2b. Each response signal or J get is transmitted to the device 1a in the order of the connection response signal 2B,
Communication between the terminal device 1a and the terminal device 1b becomes possible.

[Problem that the invention seeks to solve]

Since the conventional packet switching system described above is configured as described above, the physical address of the called terminal device is set in the inquiry response/signature packet for the inquiry packet from the calling side switching device. .

determined. However, when connecting calling and receiving terminal devices via a communication processing device that implements a communication service by processing received data and sending packets to a set destination, Information on the physical address of the communication processing device selected from the attribute information of the calling/receiving terminal device is required! be. When attempting to obtain this physical address from the calling side switching equipment, there is a problem in that each switching equipment must have attribute information of all terminal devices.

This invention was made in order to solve this problem, and the attribute information of all terminal devices is managed by an exchange management device without the need for each exchange device to have it. It is an object of the present invention to provide a packet switching service system in which a communication processing device to be routed through is indicated along with the physical address of the other party's terminal device.

[Means for solving problems]

In the packet switching service system according to the present invention, when a terminal device receives a connection request signal, the switching device transmits the physical address of the transfer destination of the connection request node and the incoming call/JO specified in the connection request packet. The switching management device is equipped with means for inquiring the terminal device i-address corresponding to the person number to the switching management device, and the switching management device can inquire about all the terminal devices accommodated in the packet switching system in response to the inquiry from the switching device. , a terminal device that holds a total of eight user tables showing correspondence between subscriber numbers, terminal physical addresses, and terminal attribute identifiers indicating their attributes, and has two types of terminal attribute identifiers and respective terminal attribute identifiers. It maintains a communication processing table that shows the correspondence between communication processing addresses that indicate the physical locations of the communication processing devices that need to go through when connecting between Refers to the subscriber table and communication processing table to determine whether or not it is necessary to go through a communication processing device, and if necessary, performs the communication processing based on the physical address of the fflfi and the called subscriber number. The system is equipped with means for determining the physical address of the terminal to which the call is made, and if not necessary, determining the physical address of the corresponding terminal from the called subscriber number, and sending one of the physical addresses as a response to the switching device.

[Effect]

In the packet switching service system of this invention,
Since we have provided an inquiry and response mechanism between the switching management device and the switching device, the switching management device can specify the forwarding destination of the connection request packet to the switching device. The exchange management device can centrally perform processing such as determining whether or not to go through a communication processing device based on attributes and deriving a communication processing address.

〔Example〕

FIG. 1 shows an embodiment of the present invention. 1 is a block configuration diagram showing a 4-get exchange service system; FIG.

In the figure, s 1 ' 11 b e 1 c are terminal devices, 2 a and 2 b are switching devices, 3 is a switching management device, 20 is a communication processing device, and 4 is a ring-shaped trunk line. Each of the switching devices 2a, 2b, the switching management device 3, and the communication processing device 20 is a processing device exclusively for switching.
It is constructed using microcomputers, minicomputers, etc. Further, the ring-shaped trunk line 4 is, for example, a coaxial cable, an optical fiber, or the like.

FIG. 2 is a block diagram showing a switching device in the packet switching service system of FIG. 1. In the figures, 2 is a switching device similar to the switching devices 2a and 2b shown in FIG. 1, 5 is a CPU (central processing unit), 6 is a storage device,
7 is a communication device.

The storage device 6 stores various programs and data that are read and processed by the CPU 5, and the communication device 7 is used to transmit signals between the terminal device 1 and the exchange device 2 (not shown). This is the hardware that includes the transmission side equipment, etc. In the storage device 6, there is an in-office subscriber table 8. There is an exchange processing unit 91 communication processing table 19, etc.

FIG. 3 is a block diagram showing the exchange management device in the one-bit exchange service system of FIG. 1. In the figure, 3 is equivalent to the exchange management device shown in FIG. 1, 10 is a CPU, 11 is a t4t device, and 12 is a communication device. In the storage device tll, there is an all subscriber table 13. There is an exchange management processing unit 14° communication processing table 19, etc.

FIG. 4 is a format diagram showing the format of a packet transmitted over a trunk line in the packet switching service system of FIG. 1. In the figure, 15 is a destination physical address field, 16 is a source physical address field, 1
7 is a packet header field, and 18 is an additional data field.

The packet header field 17 contains information such as a code indicating the type of the packet, for example, whether it is a connection request packet or an inquiry packet.

FIG. 5 is a diagram showing the stored contents of the intra-office subscriber table in the switching device of FIG. 2. In the figure, 81 is the physical address of the exchange fclal, 82 is the number of terminal devices connected to the exchange device, 83 is the subscriber number, and 84 is the terminal device accommodation that indicates the housing position of the terminal device 1 in the exchange device. Location physical address, 85 is the above terminal device T1t
These are terminal attribute identifiers indicating attributes of 1, and each exists in the 90 person table 8 within the station. In the example shown in FIG. 5, for the subscriber numbers 83 (1) to [m] of the terminal devices connected to the exchange device 2, the corresponding terminal device accommodation location physical addresses 84 (1) to [m] are )～[m]
and terminal 4 gender identifier 85 [: P(1)) ~(Ptr
rD is provided.

FIG. 6 is a diagram showing the stored contents of the all-subscriber table in the exchange management device of FIG. 3. In the figure, 131 is the physical address of the switching management device, 132 is the total number of terminal devices in the packet switching service system shown in FIG.
133 is the physical address of the exchange FE device to which the terminal device 1 is connected; 134 is the physical address of the terminal device accommodation location indicating the accommodation location of the terminal device 1 in the exchange device; and 135 is the terminal attribute indicating the attribute of the terminal device 1. These are identifiers, each of which exists in the all subscriber table 13.

In the example shown in FIG. 6, subscriber numbers [1] to (n)
, the corresponding terminal physical addresses are [1] to [n] of 4 physical addresses 133 for the switching equipment to which the terminal equipment is connected, and the accommodation position of the terminal equipment in the switching equipment. [1] to [n] of the terminal device accommodation location physical address 134 indicating
35 (Pn):If~CP+nl) are provided.

FIG. 7 is a diagram showing the stored contents of the communication processing table in FIGS. 2 and 3. FIG. In the figure, 191 indicates the terminal attribute identifier of the calling terminal device, 192 indicates the terminal attribute identifier of the called terminal device, and 194 indicates the physical location of the communication processing device required to connect the above terminal devices. The communication processing address 193 is a processing flag that identifies whether or not it is necessary to go through the communication processing device, and each exists in the communication processing table 19. In the example shown in FIG. 7, the terminal attribute identifier of the calling/receiving terminal device is [1]
~(r), the corresponding processing flag 19
3 (Fil) ) to [: F(r) ) and communication processing addresses 194 [l] to [r] are provided.

FIG. 8 shows a terminal device, a communication device, and a switching management device in the packet switching service system shown in FIG.

FIG. 3 is a diagram showing an example of a sequence of signals and packets between the communication processing device and the communication processing device. In this example, when the terminal device 1a connected to the switching device 2a requests connection to the terminal device 1b connected to the switching device 2b, each terminal device [1a and lb, 2b shows the sequence of signals and packets between the switching/U-embedding device 32 and the communication processing device 20. In the figure, 21 is a d request signal;
22 is an inquiry) ξ get, 23 is an inquiry response packet, 24 is a connection request packet, 25 is an incoming call signal, 26 is an incoming call response signal, 27 is a connection response/get, and 28 is a connection response signal.

Next, the operation of the packet switching service system of the present invention described above will be explained with reference to FIGS. 1 to 8. Now, when the switching device 2a receives the connection request signal 21 from the terminal device 1a, the switching device 2a refers to the in-office subscriber table 8 in its own switching device, and selects the incoming call indicated in the connection request signal 21. It is checked whether there is a subscriber number 83 in the intra-office subscriber table 8 that matches the subscriber number. In this case, when there is no matching subscriber number in the intra-office subscriber table 8, the switching device 2a sends the subscriber number of the calling/terminating terminal device to the switching management device 3 in the attached data field 18. Send the set inquiry message 22. The exchange management device 3 that has received this inquiry/zeget 22 refers to the all-subscriber table 13 and sets each of the called iJn person number and the calling subscriber number shown in the inquiry packet 22. The corresponding terminal attribute identifiers are compared, and if they do not match, the communication processing table 19 is referred to using each terminal attribute identifier corresponding to the calling/receiving subscriber number as a key to obtain the corresponding processing flag and communication processing address. If the processing flag is ON, the corresponding communication processing address and all initiator table 13 are referred to, and the physical address of the switching device corresponding to the called subscriber number and the Mizusue J'-di capacity It The switching device 2 sends the inquiry response packet 23 in which the terminal physical address consisting of the physical address is set in the additional data field 18.
Return to a.

In addition, if the terminal attribute identifiers corresponding to the incoming call subscriber number and the calling subscriber number match, or in the event that the above processing flag is OFF, the total zero account subscriber table 13
The inquiry response packet 23 in which the terminal physical address consisting of the physical address of the switching device corresponding to the called subscriber number and the physical address for accommodating the terminal device is set in the additional data field 18 is sent to the exchange fA device 2a. return. 5e
The switching device 2a converts the communication processing address shown in the inquiry response packet 23 into the destination physical address field 1.
The connection request packet 24, which is lost once every 5, is transmitted.

Communication processing device 20 that received this connection request packet 24
transmits a connection request packet 24 in which the terminal physical address shown in the Shinai data field 18 is set in the destination physical address field 15. The switching device 2b that received this connection request packet 24 knows from the destination physical address field 15 in the connection request packet 24 that the connection request is addressed to the terminal device lb, and sends an incoming call signal 25 to the terminal device 1b. do. Thereafter, first, the terminal device 1b sends an incoming call response signal 26 to the switching device 2b, then the switching device 2b sends a connection response packet 27 to the communication processing device 20ζ, and then the communication processing device 20 sends a call response signal 26 to the switching device. 2a, read response packet 27, and finally, connection response signal 2 from exchange 1t2a to terminal 11a.
Each response signal or gukerat is sent in the order of 8,
This enables communication between the terminal gc 1a and the terminal device 1b. Note that in the above sequence,
Each exchange device 2a.

2b, exchange management device #3. The transmission of various packets between the communication processing device 20 and the communication processing device 20 are all carried out via the trunk line 4 in FIG.
It is done using. Furthermore, when the switching equipment 2a that received the connection request signal 21 refers to the one-person table 8 within the office, the subscriber number matching the called subscriber number shown in the connection request signal 21 is found within the office. If it exists in the subscriber number 83 in the subscriber table 8, compare the four unattributed identifiers corresponding to the called subscriber number and the calling subscriber number, and if they do not match, , refers to the communication processing table 19 using each terminal attribute identifier corresponding to the calling/terminating subscriber number as a key, and obtains the corresponding processing flag and communication processing address. If the processing flag is ON, a connection request packet 24 with the corresponding communication processing address set in the destination physical address field 15 is transmitted. In addition, if the terminal attribute identifiers corresponding to the called subscriber number and the calling subscriber number match, or if the above processing flag is OFF, the terminal device that is the target of the connection request is connected to the switching device. Since they are directly connected, the switching device 2a directly transmits the incoming signal to the terminal device.

In the above embodiment, in order to obtain the terminal attribute identifier of the calling terminal device, the exchange management device 3 sends the inquiry packet 2.
The all subscriber table 13 is referred to using the calling subscriber number set in 2 as a key, but the inquiry packet 2
In place of the calling subscriber number, the terminal attribute identifier of the calling terminal device may be set in 2.

〔Effect of the invention〕

As explained above, the present invention provides a packet switching system comprising a plurality of switching devices connected to a trunk line, a communication processing device, a switching management device, and a plurality of terminal devices connected to the switching device. An inquiry and response mechanism is provided between the exchange management device and the exchange device or communication processing device, and the exchange management device specifies the forwarding destination of the connection request packet to the exchange device and communication processing device. The switching device connects to the called terminal fe& without being aware of whether or not the connection is to be made via the communication processing device.
It has the excellent effect of being able to do this.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing a packet switching service system which is an embodiment of the present invention, FIG. 2 is a block configuration diagram showing a switching device in the packet switching service system of FIG. 1, and FIG. FIG. 4 is a block configuration diagram showing the switching management device in the packet switching service system of FIG. 1, FIG. 4 is a format diagram showing the format of the packet transmitted to the trunk line in the packet switching service system of FIG. The description of the internal subscriber table in the second prisoner's exchange LC is a diagram showing the contents, FIG. 6 is a diagram showing the stored contents of the all subscriber table in the exchange management device of FIG. 3, and FIG. FIG. 8 is a diagram showing the storage contents of the communication processing table in FIGS. 2 and 3, and FIG. 8 is a diagram showing the storage contents of the communication processing table in FIG. FIG. 9 is a block diagram showing an example of a conventional switching system, and FIG. FIG. 3 is a diagram illustrating an example of a packet sequence. In the figure, 1. la, lb, lc...terminal device, 2
．． 2a, 2b... exchange device, 3... exchange management device,
4... Trunk line, 5, 10... CPU (central processing unit), 6.11... Storage device, 7, 12... Communication device, 8... In-office subscriber table, 81,133 ... Physical address of exchange device, 82 ... Number of terminal devices, 83.
...Subscriber number, 84,134...Terminal device accommodation location physical address, 85,135...Terminal attribute identifier, 9
. . . Exchange processing unit, 13 . . . All subscriber table, 13
1... Physical address of exchange management device, 132... Total number of terminal devices, 14... Exchange management processing unit 1.15...
Destination physical address field, 16... Source physical address field, 17... Packet header field, 58... Additional data field, 19... Communication processing table, 191... Calling side terminal device Terminal attribute identifier, 192...Terminal attribute identifier of called terminal device, 193...Processing flag, 194...Communication processing address, 20...Communication processing! f, 21... Connection request signal, 22... Inquiry packet, 23... Inquiry response packet, 24... Connection request packet, 25...
- Incoming call signal, 26... Incoming call response signal, 27... Connection response packet, 28... Connection response signal. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] A packet switching system comprising a plurality of switching devices connected to a trunk line, a communication processing device, a switching management device, and a plurality of terminal devices connected to the switching device, comprising: It is assumed that the terminal device is assigned a subscriber number independent of its physical location, and the communication processing device is configured to:
The received packet shall be subjected to specific processing and sent to a designated destination, and the switching management device shall store the subscriber number and information for all the terminal devices accommodated in the packet switching system. The terminal attribute identifier of the calling terminal device that maintains a table of all subscribers indicating the correspondence between the terminal physical address indicating the physical location and the terminal attribute identifier indicating the attribute of the terminal device, and transmitting the connection request signal. , the terminal attribute identifier of the called terminal device corresponding to the called subscriber number specified in the connection request signal, and the terminal attribute identifier of the called terminal device that is used when connecting the calling terminal device and the called terminal device A communication processing table showing the correspondence with a communication processing address indicating the physical location of the communication processing device is maintained, and the switching device that receives a connection request signal from the terminal device uses an inquiry packet. The switching management device inquires of the physical address of the called terminal device and the communication processing address to the switching management device, and accordingly, the switching management device refers to the all subscriber table and the communication processing table and response means for deriving the communication processing address corresponding to the physical address of the terminal device and responding using an inquiry response packet; a first transmitting means for transmitting a connection request packet including a physical address of a calling terminal; and second transmitting means for transmitting request packets.