JP6780540B2 - Communication systems, communication methods, subscriber servers, and communication programs - Google Patents

Description

The present invention relates to a communication system, a communication method, a subscriber server, and a communication program, for example, while connecting to a PSTN (Public Switched Telephone Network), internally an IP (Internet Protocol) communication network / SIP (Session). It can be applied to a communication system for a telecommunications carrier (communication carrier) configured by an Initiation Protocol) communication network.

Generally, when telephone communication is relayed between telecommunications carriers, the settlement of network usage fees is decided by consultation between the telecommunications carriers.

For example, the subscriber of the first telecommunications carrier makes a call to the subscriber of the second telecommunications carrier to perform telephone communication, and the second telecommunications carrier on the receiving side is the first on the calling side. It is assumed that the network usage fee is charged to the telecommunications carrier of the above, and the first telecommunications carrier charges the user.

In this case, the first telecommunications carrier that charges the user is called a "selective telecommunications carrier", and the second telecommunications carrier that relays the communication and charges the first telecommunications carrier for its network usage fee. Is called a "relay operator". When telephone communication is relayed between telecommunications carriers, the telecommunications carrier identifies the selected telecommunications carrier for each call and charges the network usage fee.

By the way, call control processing (signaling) using a message (protocol) called ISUP (Integrated Services Digital Network User Part) is performed between exchanges connected to the PSTN.

Then, in ISUP, as a method of recognizing (identifying) the selected relay company by the switch of the relay company, the switch of the selected relay company transmits the selected relay company information to the IAM (Initial Address Message) signal and the ACM (Addless Computing Machine) ) Processing to add to the signal is prepared.

Further, conventionally, a relay exchange corresponding to ISUP and SIP (relay exchange connected to PSTN and IP / SIP) receives a telephone communication to a subscriber accommodation exchange (exchange accommodating a subscriber) corresponding only to SIP. There is also a communication system of a business operator (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-250330

However, conventionally, when a relay exchange corresponding to ISUP and SIP relays telephone communication to a subscriber accommodation exchange (exchange accommodating a subscriber) corresponding only to SIP, the selected relay operator information cannot be notified to the PSTN side. There was a problem.

This is because the relay exchange corresponding to ISUP transmits the operator information when the selective relay operator information is notified from the rear side, but the subscriber accommodation exchange is the selective relay when the relay exchange is on the rear side. This is because it does not support the conditions for setting business information. As a result, the selective relay operator information is not added to the ACM signal transmitted from the subscriber accommodation exchange (exchange that accommodates the subscriber) that supports only SIP, and the selective relay operator is selected and relayed to the PSTN side (selective relay operator side). There was a problem that the business information was not notified.

Therefore, a communication system that easily manages billing using a subscriber server (for example, a subscriber accommodation switch) connected to a relay server (for example, a relay exchange) that connects to a public telephone network and an IP network and relays telephone communications. , Communication methods, subscriber servers (eg, subscriber accommodation exchanges), and communication programs are desired.

The first invention includes a relay server that relays and connects between a public telephone network and an IP network, and a subscriber server that connects to the relay server from the IP network and receives a connection from a subscriber communication device. In the communication system, (1) the subscriber server transmits and receives (1-1) a call control signal in which a call control signal on the public telephone network is encapsulated in the call control signal on the IP network with the relay server. As a result, the call control means for controlling the call of the telephone communication between the public telephone network and the subscriber communication device, and (1-2) the operator identification indicating the communication operator to which the subscriber server belongs. A station data storage unit in which data including information is recorded is provided. (1-3) The call control means receives a connection request call control signal from the relay server to request a call connection coming from the public telephone network. When received, it responds to the connection request call control signal according to the transit carrier information and the selected relay carrier information set in the connection request call control signal and the data set in the station data storage unit. It is characterized in that the selective relay communication carrier information is inserted into the answer call control signal to be performed and transmitted to the public telephone network side via the relay server.

The second invention includes a relay server that relays and connects between the public telephone network and the IP network, and a subscriber server that connects to the relay server from the IP network and receives a connection from the subscriber communication device. In the communication method of the communication system, (1) the subscriber server has a call control means and a station data storage unit, and (2) the call control means uses the public telephone as a call control signal on the IP network. By transmitting and receiving a call control signal that encapsulates a call control signal on the network to the relay server, call control of telephone communication between the public telephone network and the subscriber communication device is performed, and (3) the above. The station data storage unit records data including a carrier identification information indicating a communication carrier to which the subscriber server belongs, and (4) the call control means is from the relay server and from the public telephone network. When a connection request call control signal requesting an incoming call connection is received, the transit communication operator information and the selected relay communication operator information set in the connection request call control signal and the selected relay communication operator information are set in the station data storage unit. It is characterized in that selective relay communication operator information is inserted into a response call control signal that responds to the connection request call control signal according to the data, and is transmitted to the public telephone network side via the relay server.

A third aspect of the present invention is a subscriber server that connects to a relay server that relays and connects between a public telephone network and an IP network from the IP network and receives a connection from a subscriber communication device. (1) The IP Telephone communication between the public telephone network and the subscriber communication device by transmitting and receiving a call control signal in which the call control signal on the public telephone network is encapsulated in the call control signal on the network with the relay server. It is provided with a call control means for performing the call control of the above, and (2) a station data storage unit in which data including a carrier identification information indicating a carrier to which the subscriber server belongs is recorded, and (3) the call control. When the means receives a connection request call control signal requesting a call connection coming from the public telephone network from the relay server, the transit carrier information and the selective relay communication business set in the connection request call control signal. Selective relay communication carrier information is inserted into the response call control signal that responds to the connection request call control signal according to the person information and the data set in the station data storage unit, and the relay server is used for the selection. It is characterized by transmitting to the public telephone network side.

A fourth aspect of the present invention is to connect a computer mounted on a subscriber server that connects from the IP network and receives a connection from a subscriber communication device to a relay server that relays and connects between a public telephone network and an IP network. (1) By transmitting and receiving a call control signal in which a call control signal on the public telephone network is encapsulated in the call control signal on the IP network with the relay server, the public telephone network and the subscriber communication device It functions as a call control means for controlling the call of the telephone communication between the telephones and (2) a station data storage unit in which data including the carrier identification information indicating the carrier to which the subscriber server belongs is recorded. 3) When the call control means receives a connection request call control signal requesting a call connection coming from the public telephone network from the relay server, the via communication carrier information set in the connection request call control signal And the selective relay communication carrier information is inserted into the answer call control signal that responds to the connection request call control signal according to the data set in the station data storage unit, and the relay is relayed. It is characterized in that it is transmitted to the public telephone network side via a server.

According to the present invention, it is possible to provide a communication system that easily manages billing by using a subscriber server that connects to a public telephone network and an IP network and connects to a relay server that relays telephone communications.

It is a sequence diagram which showed the operation of the communication system which concerns on embodiment. It is a block diagram which showed the connection structure of the communication system which concerns on embodiment. It is a block diagram which showed the functional configuration of the subscriber accommodation exchange (subscriber server) which concerns on embodiment.

(A) Main Embodiments Hereinafter, one embodiment of a communication system, a communication method, a subscriber server, and a communication program according to the present invention will be described in detail with reference to the drawings. In the following, an example in which the subscriber server of the present invention is applied to a subscriber accommodation exchange will be described.

(A-1) Configuration of the Embodiment FIG. 2 is a block diagram showing a connection configuration of the communication system 1 of the embodiment.

FIG. 2 shows a configuration in which the communication equipment of the communication carrier A and the communication equipment of the communication carrier B are connected to the PSTN1000.

FIG. 2 shows a configuration in which the communication system 1 of this embodiment is applied to the communication equipment of the communication carrier A. FIG. 2 shows an example in which a conventional device is applied to the communication equipment on the communication carrier B side. The communication system of the present invention (including the subscriber server of the present invention) may also be applied to the telecommunications carrier B.

First, the outline of the configuration of the communication system 1 on the communication carrier A side will be described.

Communication system 1 shown in FIG. 2 includes relay exchanges 10 (10-1, 10-2) as two relay servers and three subscriber accommodation exchanges 20 (20-1, 20-2, 20-3). Have.

In the communication system 1, the number of the relay exchange 10 and the subscriber accommodation exchange 20 is not limited.

The relay exchanges 10-1 and 10-2 are connected to the PSTN1000, respectively. The relay exchanges 10-1 and 10-2 perform call control using an ISUP signal for a telephone communication call with the PSTN1000. Further, the relay exchanges 10-1 and 10-2 communicate by IP communication in the communication system 1, and perform a call control process using a SIP-T (SIP for Telephones) signal for telephone communication. Therefore, in the communication system 1, the relay exchanges 10-1 and 10-2 mutually perform call control processing using SIP-T. In addition, the relay exchanges 10-1 and 10-2 perform call control processing using the subscriber accommodation exchange 20 under the control and the SIP-T signal.

In the example of FIG. 2, two subscriber accommodation exchanges 20-1 and 20-2 are connected under the relay exchange 10-1. Further, one subscriber accommodation exchange 20-3 is connected under the relay exchange 10-2.

In FIG. 2, for the sake of simplicity, the subscriber communication device 30 is connected only to the subscriber accommodation switch 20-1, but the subscriber communication device 30 connected to each subscriber accommodation switch 20 The number is not limited. The specifications of the subscriber communication device 30 are not limited, and may be, for example, an IP telephone terminal compatible with SIP-T or an analog telephone terminal (two-wire telephone terminal).

Next, the outline of the configuration on the telecommunications carrier B side will be described.

The telecommunications carrier B is provided with a relay exchange 40 connected to the PSTN 1000 and a subscriber accommodation exchange 50 connected under the relay exchange 40. Further, a subscriber communication device 60 is connected to the subscriber accommodation exchange 50.

The relay exchange 40 performs call control using the ISUP signal with the PSTN1000 and the subscriber accommodation exchange 50 for telephone communication calls. Therefore, the subscriber accommodation exchange 50 also performs call control using the ISUP signal with the relay exchange 40.

In FIG. 2, the equipment on the telecommunications carrier B side is shown as the minimum configuration for the sake of simplicity, but the number of each device on the telecommunications carrier B side is not limited.

Further, in FIG. 2, only the telecommunications carrier A and the telecommunications carrier B are shown as the telecommunications carriers connected to the PSTN1000 for the sake of simplicity, but other telecommunications carriers are connected inside and outside the PSTN1000. It may be.

Next, the internal configuration of the subscriber accommodation exchange 20 (20-1, 20-2, 20-3) will be described.

FIG. 3 is a block diagram showing a functional configuration of the subscriber accommodation switch 20. In this embodiment, the subscriber accommodation exchanges 20-1, 20-2, and 20-3 are all described as being able to be shown with reference to FIG.

The subscriber accommodation exchange 20 has a communication processing unit 31, an upper IF 32, a subscriber IF 33, a control unit 34, and a station data storage unit 35.

The control unit 34 has a function of controlling the entire subscriber accommodation exchange 20.

The upper side IF 32 is an interface for connecting to the upper side (relay switch 10).

The subscriber side IF 33 is an interface for connecting to the subscriber communication device 30.

For the upper side IF32 and the subscriber side IF33, interfaces having various specifications according to the connection destination can be applied.

The communication processing unit 31 performs communication processing with the relay exchange 10 via the upper IF 32 and communication processing with the subscriber communication device 30 via the subscriber IF 33 under the control of the control unit 34. The communication processing unit 31 performs call control processing and relay (including signal conversion) of the telephone communication path between the upper side (relay exchange 10) and the subscriber side (subscriber communication device 30).

The station data storage unit 35 stores various setting information used for processing such as call control by the communication processing unit 31 and the control unit 34. It is assumed that the operator code of the own station (own device) (the operator code of the telecommunications carrier to which the own station belongs (the operator identification information)) is also set in the station data storage unit 35. Here, the carrier code CA of the telecommunications carrier A is set as the carrier code of the own station (own device) in the relay exchanges 10-1 and 10-2, which are the devices of the telecommunications carrier A. And.

(A-2) Operation of the Embodiment Next, the operation of the communication system 1 having the above configuration will be described.

FIG. 1 is a sequence diagram showing an example of the operation of the communication system 1.

FIG. 1 shows an operation when a call is made from the subscriber communication device 60 of the communication carrier B to the subscriber communication device 30 of the communication carrier A as a destination. In FIG. 1, it is assumed that the selective relay operator of the call from the subscriber communication device 60 is the communication operator A.

Then, here, the call issued from the subscriber communication device 60 is received by the subscriber accommodation exchange 50 in the network of the communication carrier B, and is connected to the PSTN1000 via the relay exchange 40. Then, in the communication system 1 of the telecommunications carrier A, the call issued from the subscriber communication device 60 is selectively relayed by the relay switch 10-1, and the subscriber accommodation switch 20- connected to the subscriber communication device 30. It is assumed that an incoming call arrives at 1.

In FIG. 1, with respect to a call issued from the subscriber communication device 60, a call control signal (PSTN1000, a relay exchange 10-1 and a subscriber accommodation exchange 20-1) transmitted and received on the communication system 1 side are transmitted and received. Only the call control signal) is shown. Actually, the relay switchboard 10-1 is connected to the relay switchboard 40 via the PSTN1000 (relay switchboard in the PSTN1000), but the illustration is omitted in FIG.

First, the relay switch 40 and the relay switch 10-1 are selectively relayed from the subscriber communication device 60 (a call in which the communication company A is the selective relay company, that is, a call for incoming call billing), and the PSTN 1000 transmits the call. It is assumed that the IAM signal requesting the connection of the call (the IAM signal based on the call issued from the subscriber communication device 60) has arrived at the relay exchange 10-1 (S101).

At this time, it is assumed that the transit business information display, the originator information, and other business information are inserted in the IAM signal. At this time, it is assumed that the IAM signal is set to "reverse direction" or "both directions" as the information of the "via operator information display".

Next, the relay exchange 10-1 requests a connection (relay) by SIP-T based on the received IAM signal of ISUP. Specifically, the relay switchboard 10-1 has an INVITE signal (specifically, "INVITE w / IAM") in which the received ISUP IAM signal (additional information of the IAM signal and the IAM signal) is encapsulated in the SIP signal (message). Signal) and transmitted to the subscriber accommodation switch 20-1 (S102).

At this time, in the "INVITE w / IAM" signal (message), in addition to the transit operator information display, the originator information, and other operator information as additional information of the capsulated IAM signal, the selected relay operator information is included. It shall be included. As described above, since the call is a call in which the telecommunications carrier A is the selective relay carrier (call for incoming call billing), the relay exchange 10-1 performs the selective relay business for the "INVITE w / IAM" signal. CA, which is the carrier code (telecommunications carrier identification information) of the telecommunications carrier A to which the own device belongs, is added as the person information.

Then, here, based on the received "INVITE w / IAM" signal, the subscriber accommodation switch 20-1 confirms the status of the subscriber communication device 30 (for example, whether or not it is busy and whether or not it is possible to receive an incoming call. It is assumed that the SIP-T signal (18x signal) that responds to the received "INVITE w / IAM" signal is responded to the relay exchange 10-1 (S103).

At this time, the communication processing unit 31 of the subscriber accommodation switch 20-1 uses the SIP-T 18x signal (message) that capsulates the ACM signal that responds to the IAM signal that is capped to the received "INVITE w / IAM" signal. , Generates a "18x (INVITE) w / ACM" signal (message).

At this time, the communication processing unit 31 of the subscriber accommodation exchange 20-1 is in the case where the transit operator information display set in the received "INVITE w / IAM" is "reverse direction" or "both directions", and The operator code of the selected relay operator information set in the received "INVITE w / IAM" is the operator code of the own station (own device) (the operator code of the own station set in the station data storage unit 35). If it matches, the selected relay operator information shall be inserted into the responding "18x (INVITE) w / ACM" signal (capsulated ACM signal). The communication processing unit 31 of the subscriber accommodation switch 20-1 acquires the selected carrier information of the received "INVITE w / IAM" signal and copies it to the responding "18x (INVITE) w / ACM" signal. It may be inserted (the carrier code "CA" of the carrier A is inserted).

Then, when the relay switchboard 10-1 receives the "18x (INVITE) w / ACM" signal from the subscriber accommodation switchboard 20-1, the relay switchboard 10-1 is added to the ACM signal encapsulated in the "18x (INVITE) w / ACM" signal. The generated data (option) is copied (transparently) to the ACM signal of ISUP as it is and sent to the PSTN1000 side (relay switch 40) (S104).

As described above, the ACM signal is capsulated by the processing of the subscriber accommodation switch 20-1 (communication processing unit 31) in step S103, and is selected as the 18x signal (“18x (INVITE) w / ACM signal” in this embodiment). The relay company information is inserted. Then, since the relay exchange 10-1 transmits the information from the rear side (in this case, the information from the subscriber accommodation exchange 20-1) with respect to the ACM signal, the relay exchange 10-1 is transferred to the PSTN1000 side. It is possible to notify the selected relay operator information (transmit the information from the subscriber accommodation exchange 20-1) at the time of sending the ACM.

In this embodiment, the communication processing unit 31 of the subscriber accommodation exchange 20-1 is in the case where the transit operator information display set in the received "INVITE w / IAM" signal is "reverse direction" or "both directions". In addition, the operator code of the selected relay operator information set in the received "INVITE w / IAM" signal is the operator code of the own station (own device) (of the own station set in the station data storage unit 35). If it matches the operator code), the selected relay operator information is inserted into the responding "18x (INVITE) w / ACM" signal (capsulated ACM signal).

If the transit operator information display set in the received "INVITE w / IAM" is "forward", the transmitting relay exchange 40 requests the receiving side information (selected relay operator information, etc.). Therefore, the communication processing unit 31 of the subscriber accommodation exchange 20-1 does not need to insert the selected relay operator information into the responding "18x (INVITE) w / ACM" signal.

Further, in the communication processing unit 31 of the subscriber accommodation switch 20-1, the operator code of the selected relay operator information of "INVITE w / IAM" received is the operator code of the own station (own device) (the above example). In the case of, respond "18x (INVITE) w / ACM" to notify the front side that the selective relay has been performed within the same carrier only when it matches the carrier code CA of the carrier A). The selected relay company information is inserted in. In this case, when the subscriber accommodation exchange 20-1 transmits the responding "18x (INVITE) w / ACM", it is possible to notify the PSTN1000 side that the selection has been relayed within the same operator. Therefore, as a condition for placing the selected relay operator information on the responding "18x (INVITE) w / ACM", the operator code of the received "INVITE w / IAM" selected relay operator information is the own station (own device). ) Must match the business code. Therefore, the subscriber accommodation exchange 20-1 responds when the business code of the selected relay business information of the received "INVITE w / IAM" does not match the business code of its own station (own device) "18x". (INVITE) w / ACM ”will not be able to carry selected relay operator information. However, in that case, the relay switch of another relay carrier (other telecommunications carrier) that selectively relays retains the information (selective relay carrier information) when the relay carrier (telecommunications carrier) selectively relays. Therefore, the relay exchange of the relay operator that selectively relays the relay sets the selective relay operator information in the ACM signal.

(A-3) Effect of Embodiment According to this embodiment, the following effects can be achieved.

In the subscriber accommodation exchange 20-1 of the communication system 1 of this embodiment, the calls entered and connected from the PSTN1000 are selectively relayed by the relay exchange 10-1, and the subscribers in the same operator (in the communication operator A). Even when an incoming call arrives at the accommodation exchange 20-1, the selective relay in the inter-operator charge settlement information transfer message (in this embodiment, the 18x signal in which the ACM signal is capsulated) of the relay exchange 10-1 and the subscriber accommodation exchange 20-1. It is possible to map business information (inter-business charge settlement information). As a result, the telecommunications carrier using the communication system 1 does not have to prepare another billing management means, so that the billing management can be easily performed.

Specifically, the communication processing unit 31 of the subscriber accommodation exchange 20-1 displays the transit operator information set in the received "18x (INVITE) w / ACM signal" in "reverse direction" or "both directions". In a certain case, the operator code of the selected relay operator information set in the received "18x (INVITE) w / ACM signal" is the operator code of the own station (own device) (station data storage unit 35). If it matches the set operator code of the own station, the selected relay operator information is mapped to the responding "18x (INVITE) w / ACM" signal (capsulated ACM signal) ("18x (INVITE) w". (Map the operator code of the selected relay operator information set in "/ ACM signal").

That is, as described above, the subscriber accommodation switchboard 20 (communication processing unit 31) of this embodiment selectively relays the ACM signal to the capsulated 18x signal (“18x (INVITE) w / ACM signal” in this embodiment). It supports the function to insert business information. Since the subscriber accommodation switch 20 (communication processing unit 31) corresponding to SIP-T does not support the function of inserting the normal selective relay operator information into the 18x signal in which the ACM signal is capsulated, the conventional means is other means. Billing management was performed by (for example, analysis of SIP log information, update of the subscriber database using another signal, etc.). However, since the communication system 1 is a device that connects to the PSTN1000 (a device that does not directly connect to the PSTN1000), the subscriber accommodation switch 20 connected to the IP network (SIP network) also supports billing management using ISUP. By doing so, it is possible to facilitate billing management using ISUP.

Temporarily, the relay switch 10-1 does not transmit the "18x (INVITE) w / ACM signal" received from the subscriber accommodation switch 20-1, but selects and relays the "18x (INVITE) w / ACM signal" to the "18x (INVITE) w / ACM signal". It is possible to perform processing to add personal information, but since it will be a major design change, the cost to ensure that other relay processing is not affected when implementing (for example, design, development, testing, etc.) Cost) becomes large. In particular, at present, changing the signal processing method of the relay switchboard 10 corresponding to the legacy technology such as ISUP requires a larger cost than changing the subscriber accommodation switchboard 20 corresponding to the relatively new technology such as SIP-T. It becomes. Further, since the subscriber accommodation switch 20 corresponds to the terminal (edge) as the equipment of the communication company (device of the communication system 1), even if the signal processing method is changed, the influence on other devices is small. Therefore, the cost for changing the signal processing method is smaller than that of the relay switch 10.

(B) Other Embodiments The present invention is not limited to the above embodiments, and modified embodiments as illustrated below can also be mentioned.

(B-1) In the above embodiment, in the subscriber accommodation switch 20-1, the calls entered and connected from the PSTN1000 are selectively relayed by the relay switch 10-1 within the same carrier (in the telecommunications carrier A). Even when an incoming call arrives at the subscriber accommodation exchange 20-1, the selective relay operator information is mapped in the 18x signal in which the ACM signal is capsulated, but in other patterns as in the above embodiment, 18x is appropriately used. The process of inserting the selected relay operator information into the signal (18x signal to which the ACM signal is mapped) may be performed.

For example, when the relay switch 10 is connected from the PSTN 1000 and further receives an incoming call from the relay switch 10 (selective relay call) via the NX-SCP (network use special number (0037)) (IAM). Even when the signal is a capsulated "INVITE w / IAM" signal), the selected relay operator information is inserted into the "18x (INVITE) w / ACM" signal that responds in the same manner as in the above embodiment. It may be.

1 ... Communication system, 10, 10-1, 10-2 ... Relay exchange, 20, 20-1, 20-2, 20-3 ... Subscriber accommodation exchange, 31 ... Communication processing unit, 32 ... Upper IF, 33 ... Subscriber side IF, 34 ... Control unit, 35 ... Station data storage unit, 30 ... Subscriber communication device, 1000 ... PSTN.

Claims (6)

In a communication system including a relay server that relays and connects between a public telephone network and an IP network, and a subscriber server that connects to the relay server from the IP network and receives a connection from a subscriber communication device.
The subscriber server
By transmitting and receiving a call control signal in which the call control signal on the public telephone network is encapsulated in the call control signal on the IP network with the relay server, the public telephone network and the subscriber communication device are used. Call control means for controlling the call of telephone communication and
It is equipped with a station data storage unit in which data including carrier identification information indicating the carrier to which the subscriber server belongs is recorded.
When the call control means receives a connection request call control signal requesting a call connection coming from the public telephone network from the relay server, the transit carrier information and selection set in the connection request call control signal. Selective relay communication carrier information is inserted into the response call control signal that responds to the connection request call control signal according to the relay communication carrier information and the data set in the station data storage unit, and the relay server is used. A communication system characterized by transmitting to the public telephone network side via the above. In the call control means, the transit operator information display of the received connection request call control signal is in the opposite direction or both directions, and further, the content of the selected relay operator information of the received connection request call control signal and the station data. The first aspect of claim 1, wherein when the operator identification information set in the storage unit matches, the selective relay communication operator information is inserted into the response call control signal that responds to the connection request call control signal. Communications system. The call control means sets the same content as the selected relay operator information of the received connection request call control signal as the selective relay carrier information to be set in the answer call control signal that responds to the connection request call control signal. The communication system according to claim 2, wherein the communication system is characterized by the above. In a communication method of a communication system including a relay server for relay connection between a public telephone network and an IP network, and a subscriber server for connecting to the relay server from the IP network and receiving a connection from a subscriber communication device.
The subscriber server has a call control means and a station data storage unit.
The call control means transmits and receives a call control signal in which a call control signal on the public telephone network is encapsulated in the call control signal on the IP network to and from the relay server, thereby causing the public telephone network and the subscriber. Controls the call for telephone communication with the communication device,
The station data storage unit records data including carrier identification information indicating the carrier to which the subscriber server belongs.
When the call control means receives a connection request call control signal requesting a call connection coming from the public telephone network from the relay server, the transit carrier information and selection set in the connection request call control signal. Selective relay communication carrier information is inserted into the response call control signal that responds to the connection request call control signal according to the relay communication carrier information and the data set in the station data storage unit, and the relay server is used. A communication method characterized by transmitting to the public telephone network side via the above. In the subscriber server that connects from the IP network and receives the connection from the subscriber communication device to the relay server that relays and connects between the public telephone network and the IP network.
By transmitting and receiving a call control signal in which the call control signal on the public telephone network is encapsulated in the call control signal on the IP network with the relay server, the public telephone network and the subscriber communication device are used. Call control means for controlling the call of telephone communication and
It is equipped with a station data storage unit in which data including carrier identification information indicating the carrier to which the subscriber server belongs is recorded.
When the call control means receives a connection request call control signal requesting a call connection coming from the public telephone network from the relay server, the transit carrier information and selection set in the connection request call control signal. Selective relay communication carrier information is inserted into the response call control signal that responds to the connection request call control signal according to the relay communication carrier information and the data set in the station data storage unit, and the relay server is used. A subscriber server characterized by transmitting to the public telephone network side via the above. A computer mounted on a subscriber server that connects from the IP network and receives a connection from a subscriber communication device to a relay server that relays between the public telephone network and the IP network.
By transmitting and receiving a call control signal in which the call control signal on the public telephone network is encapsulated in the call control signal on the IP network with the relay server, the public telephone network and the subscriber communication device are used. Call control means for controlling the call of telephone communication and
It functions as a station data storage unit in which data including carrier identification information indicating the carrier to which the subscriber server belongs is recorded.
When the call control means receives a connection request call control signal requesting a call connection coming from the public telephone network from the relay server, the transit carrier information and selection set in the connection request call control signal. Selective relay communication carrier information is inserted into the response call control signal that responds to the connection request call control signal according to the relay communication carrier information and the data set in the station data storage unit, and the relay server is used. A communication program characterized by transmitting to the public telephone network side via the above.

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