JP2002237887A - Call processing method and call processing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow selection in consideration of service using a terminal or the form of a connecting network and a bearer characteristic on the receiver side in contrast to the conventional art in which a plurality of bearers are not provided but an arbitrary bearer is selected by call control on a caller side. SOLUTION: A call control section 32 makes request/response to a signal control section 31 on transmission and reception of a control signal, and performs reading and writing of call information to an information storage section 34 as necessary. Further, the call control section 32 transmits a bearer establishment request to a bearer control section 33 and receives its response. The bearer control section 33 makes request/response to a signal control section 31 on transmission and reception of a control signal, performs reading and writing of bearer information to the information storage section 34 as necessary, and performs setting for establishing a bearer. The information storage section 34 stores call setting information. The call control section 32 transmits an receives call control information to and from a called station regardless of the bearer and starts the bearer control section 33 to be used based on the information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a call processing method and a call processing system, and more particularly to a call processing method and a call processing system for performing call control and bearer control.

[0002]

2. Description of the Related Art FIG. 10 is a block diagram showing an example of a main part of a conventional call processing method and a conventional call processing system. In FIG. 1, an exchange (NW) 10 accommodates lines 11, 12, and 13, and also accommodates a control line 14 and a subscriber terminal 15. The operation of the NW 10 is controlled by the central control device 20. Central control unit 2
0 is a signal control unit 21 for transmitting and receiving control signals, a request / response for control signal transmission / reception to the signal control unit 21, and a call control unit for writing / reading call information to / from the information storage unit 23 as necessary. 22 and an information storage unit 23 in which call information is written and read.

In this conventional call processing method and call processing system, an IAM, which is an address signal, is transmitted to a destination based on information obtained from another network via either the subscriber terminal 15 or the lines 11 to 13. Before the output of, an arbitrary bearer that can be selected by the calling side call control is selected. The “bearer” in the present specification is the transmission layer itself, and specifically refers to STM (Synchronous Transfer Mode), ATM (Asynchronous Transfer Mode), IP, or the like.

[0004]

In the above-mentioned conventional call processing method and call processing system, since there is no concept of a plurality of bearers and an arbitrary bearer that can be selected by the call control of the calling side is selected, a caller on the called side is selected. Form of terminal or connection network,
It is not possible to select services that take advantage of the bearer characteristics. Here, "it is impossible to select a service conscious of the service using the bearer characteristics", for example, when the connection destination subscriber is in the ATM network, the type of the bearer from the originating station to the connection destination is one. To do so, ATM may be selected as the bearer, but such selection cannot be made.

[0005] The present invention has been made in view of the above points,
An object of the present invention is to provide a call processing method and a call processing system capable of setting a bearer freely from call processing information obtained by call control by making call control and bearer control independent. It is another object of the present invention to provide a call processing method and a call processing system capable of making a selection conscious of a service utilizing a form of a called terminal or a connection network and a bearer characteristic.

[0006]

In order to achieve the above object, a call processing method according to the present invention provides a call processing method for performing call processing of an originating and terminating exchange connected to another network or a subscriber terminal. A first step in which a calling station determines a destination based on information from a caller to a calling station, and transmits an address signal including connection form information of a destination to the called station; The determined destination receives an address signal from the originating station, and determines a destination based on the address signal.
And a third step in which the destination selects the bearer type according to the connection form of the destination determined in the second step, and a response signal including the bearer type information selected in the third step. 4th to be transmitted from the destination station to the source station
And the fifth step in which the calling station receives the response signal, performs the bearer setting of the bearer type information included in the received signal by the call control unit of the calling station, and outputs the establishment request of the set bearer type. And a sixth step of confirming the bearer type in the establishment request, performing the setting for bearer establishment by the bearer control unit of the transmitting station, and transmitting a bearer setting request to the receiving station. A setting request is received, a bearer is set based on the bearer set at the calling station from the received signal, an address signal is transmitted from the called station to the called station by bearer establishment, and a bearer setting response signal is sent to the calling station. And an eighth step in which the calling station receives a bearer setting response signal and performs a bearer establishment response.

According to the present invention, the destination determines the destination, selects the bearer type according to the connection form, notifies the origin to the origin, and sets the bearer of the bearer type information to the call control unit of the origin. , The set bearer type is confirmed by the bearer control unit of the source station, and the setting for bearer establishment is performed. Therefore, the connection state of the destination station can be confirmed and the bearer forward direction can be set.

According to another aspect of the present invention, there is provided a call processing method for performing a call processing of an originating and terminating exchange connected to another network or a subscriber terminal.
A first step in which the calling station determines a destination based on information from the caller to the calling station, and transmits an address signal including connection destination information of the destination to the destination, and a first step. The destination station receives the address signal from the source station,
A second step of determining a destination based on the address signal, a third step in which the destination selects a bearer type according to a connection mode of the destination determined in the second step, and a third step Performing a bearer setting of the bearer type information selected by the destination call control unit, and output a request to establish the set bearer type;
The fifth step of confirming the bearer type in the establishment request, performing the setting for bearer establishment by the bearer control unit of the destination station, and transmitting the bearer setting request to the source station, the source station transmits the bearer setting request Receives, sets a bearer based on the bearer set at the destination from the received signal, transmits an address signal from the source to the destination by establishing the bearer, and transmits a bearer setting response signal to the destination. A sixth step and a seventh step in which the destination station receives a bearer setting response signal and performs a bearer establishment response.

In the present invention, the destination determines the destination, selects the type of bearer according to the connection form, notifies the origin to the source, and sets the bearer of the bearer type information to the call control unit of the source. In order to confirm the set bearer type by the bearer control unit of the destination station and the originating station, and to perform the setting for bearer establishment, confirm the connection state of the destination station and set the bearer reverse direction Can be.

Further, in order to achieve the above object, the present invention comprises the following first step: transmitting an address signal to a destination determined on the basis of information from the caller to the calling;
It is characterized in that the bearer information used by the caller is acquired, and the bearer information is stored in the information storage unit as a default value of the bearer setting.

When the destination is a station of another network, the fourth step is selected as a bearer type corresponding to the type of line connected to the station of the other network, and the destination is a subscriber. When the terminal is a terminal, the subscriber terminal selects a bearer of a bearer service subscribed to. According to the present invention, the bearer can be selected according to the connection state of the destination.

Further, in order to achieve the above object, the present invention provides a third step of the above-mentioned invention, wherein when the destination is a subscriber terminal not subscribed to the bearer service, the bearer type is not selected. The fifth step is characterized in that, when the bearer type information included in the response signal received by the calling station does not indicate the bearer type, the bearer setting is performed using the default value of the bearer setting stored in the information storage unit. And According to the present invention, when the bearer type information of the destination does not include the bearer type, the caller can automatically select the bearer in use.

[0013] To achieve the above object, a call processing system according to the present invention is a call processing system for performing call processing for a calling station and a destination exchange connected to another network or a subscriber terminal. A first signal control unit for transmitting and receiving a control signal, a first information storage unit for storing and reading out call setting information, and a caller input from the caller via the first signal control unit. Based on the information, a destination is determined, and the destination is caused to output an address signal including connection type information of a destination from the first signal control unit, and a bearer from the destination received by the first signal control unit is received. The first call control unit that performs the bearer setting of the bearer type information included in the response signal and outputs the established bearer type establishment request, and confirms the bearer type in the establishment request, performs the setting for bearer establishment. And the first signal control unit And a first bearer control unit for transmitting a setting request, Chakukyoku a second transmitting and receiving control signals
And a second information storage unit that stores and reads out the call setting information, and a destination that is determined based on the address signal from the source station that is received by the second signal control unit. The bearer type is selected according to the connection type of the destination, and an address signal is transmitted to the destination by the bearer establishment instruction.
A second call control unit for outputting from the signal control unit, and a bearer setting is started based on a bearer setting request from the calling station received by the second signal control unit, and after the setting is completed, a bearer establishment instruction is performed. , And a second bearer control unit for outputting a bearer setting response signal from the second signal control unit.

According to the present invention, the destination determines the destination, selects the type of bearer according to the connection form, notifies the origin to the source, and sets the bearer setting of the bearer type information to the first of the source. The first bearer control unit of the originating station confirms the set bearer type by the call control unit, and performs the setting for bearer establishment. The direction can be set.

Further, in order to achieve the above object, the call processing system of the present invention causes the second call control unit of the destination to set the bearer of the bearer type information, and sets the set bearer type of the destination. By causing the second bearer control unit to confirm and set up the bearer establishment, the connection state of the destination can be confirmed and the bearer reverse setting can be performed.

Further, in order to achieve the above object, the first call control unit acquires bearer information in use by the caller based on information from the caller to the calling station, and transfers the bearer information to the second caller. 1 is stored in the information storage unit as a default value of the bearer setting,
The second call control unit, when the destination is a station of another network, selects the bearer type corresponding to the line type connected to the station of the other network, and when the destination is a subscriber terminal, The subscriber terminal selects a bearer of a bearer service subscribed to.

Further, the second call control unit, when the destination is a subscriber terminal not subscribed to the bearer service,
If the bearer type is not selected and the first call control unit does not indicate the bearer type in the bearer type information included in the bearer response signal received by the first signal control unit, the first call control unit stores it in the first information storage unit. A bearer establishment request is made to the first bearer control unit after the bearer setting is performed according to the stored default value of the bearer setting.

[0018]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a main part of a call processing method and a call processing system according to the present invention. In the figure, the same components as those in FIG. 10 are denoted by the same reference numerals. In FIG. 1, an exchange (NW) 10 is connected to a line 16 of bearer A and a line 17 of bearer B. The exchange 10 is configured to be controlled by the central processing unit 30. The central processing unit 30 includes a signal control unit 31, a call control unit 32, a bearer control unit 33, and an information storage unit 34.

The signal controller 31 transmits and receives control signals. The call control unit 32 requests / responds to the signal control unit 31 for transmission / reception of a control signal, and performs read / write of call information in the information storage unit 34 and setting processing for establishing a call as necessary. In addition, the call control unit 32 includes the bearer control unit 3
3 transmits a bearer establishment request and receives the response. The bearer control unit 33 requests / responses the transmission / reception of the control signal to / from the signal control unit 31, reads / writes bearer information to / from the information storage unit 34 as necessary, and sets processing for establishing a bearer. I do. The information storage unit 34 holds and stores call setting information.

In this embodiment, the call control unit 32 and the bearer control unit 33 are configured as described above by making the bearer control function, which is the call control function, independent. Thereby, the call control unit 3
2 transmits / receives call control information to / from the destination without being aware of the bearer, and activates the bearer control unit 33 that the user wants to use based on the information. As a result, it is possible to select a bearer conscious of "connection on the destination side" or "service using characteristics of the bearer", which could not be performed by the conventional call control. Will be described in detail with reference to the flowcharts of FIGS. In the following description, since both the central processing unit on the calling side and the central processing unit on the receiving side have the configuration shown in FIG. 1, both of them will be described with reference to FIG.

First, an IAM (Initial Address Message:
Address signal) arrives from another network via the line or from the subscriber 15 to the signal control unit 31 of the originating station. Then, the signal control unit 31 transmits the IAM to the call control unit 32. The above-mentioned IAM is a signal transmitted first at the time of call setting (connection), and includes information required for service selection and route selection in a secondary exchange.

As a result, the call control unit 32 of the originating station
The operation according to the flowchart of FIG. That is, the call control unit 32 confirms the IAM (step 101), and
Obtain the in-use bearer information of the caller from the information in M,
The information is stored as a default value of the bearer setting in the information storage unit 34 (step 102). Subsequently, the call control unit 32
The destination is determined from the destination number in the AM (step 103),
In order to transmit the IAM to the destination, an IAM transmission request is made to the signal control unit 31 (step 104).

As a result, the IAM reaches the signal control unit of the destination from the signal control unit of the source. Incoming signal control unit 31
Transmits the IAM to the call control unit 32 of the destination station. Thereby, the call control unit 32 of the destination station operates according to the flowchart of FIG. That is, the call control unit 32 confirms the IAM from the calling station (step 201), and the information storage unit 34
The information in the IAM is stored (step 202). Subsequently, the called number is extracted from the IAM, the connection form of the called party is confirmed from the called number (step 203), and it is determined whether the called party is a subscriber terminal or another station (step 204).

For example, when the called party is a subscriber terminal, it is determined whether or not the subscriber has subscribed to a service using the bearer characteristics (step 205). The contract bearer type is read out and selected for the bearer (step 20).
6). If the subscriber has not subscribed to the bearer service, no bearer is selected.

On the other hand, if the destination is another station, a bearer is selected according to the connection form (step 207). That is, a bearer is selected according to the connection form, such as an STM bearer when connected to an STM line, an ATM bearer when connected to an ATM line, and an IP bearer when connected to an IP line. I do. In this way, the type of the determined (selected) bearer is
(Step 208), and sends a request for transmission of a response signal to the IAM to the signal control unit 31 to notify the originating station of the type of the selected bearer (step 209).

Thus, the IAM response signal reaches the signal control unit of the originating station from the signal control unit of the destination station. The signal control unit 31 of the calling station transmits a response signal to the call control unit 32 of the calling station. Thereby, the call control unit 32 of the originating station operates according to the flowchart of FIG. That is, the call control unit 32
Checks the response signal of the IAM from the destination (step 3
01), it is confirmed from the response signal whether there is a bearer type selected at the destination station (step 302).

When the type of bearer has been selected,
The bearer type selected at the destination station is extracted from the response signal,
Settings are made (step 303). If the bearer type has not been selected, the default bearer type set in the destination information storage unit 34 is extracted, and the bearer type is set (step 304). Step 30
3 or 304, the call control unit 3 of the originating station
2 makes a bearer establishment request to the bearer control unit 33 of the originating station (step 305).

Then, the bearer control unit 33 of the originating station performs the processing shown in FIG.
The operation according to the flowchart of FIG. That is, first, a bearer establishment request from the call control unit 32 is confirmed (step 401), the bearer type in the bearer establishment request is taken out, the bearer type is confirmed, and setting for bearer establishment is performed (step 402). After the source bearer type setting is completed,
A request for transmitting a bearer setting request signal to the destination is sent to the signal control unit 31 (step 403).

As a result, the bearer setting request signal reaches the signal control unit of the destination station from the signal control unit of the source station. The destination signal control unit 31 transmits a bearer setting request signal to the destination bearer control unit 33. Thereby, the bearer control unit 33 of the destination performs an operation according to the flowchart of FIG. That is, the bearer control unit 33 checks the bearer setting request signal from the calling station (step 501), and extracts the bearer information set on the calling side from the bearer setting request signal,
The setting of the bearer is started based on the information (step 50).
2).

After the bearer setting is completed, a transmission request of a bearer setting response signal is made to the destination signal control unit 31 in order to notify the end of the bearer setting to the originating bearer control unit (step 503). It sets the bearer setting information and issues a bearer establishment instruction to the call control unit 32 of the destination station (step 504).

As a result, the bearer setting response signal reaches the signal control unit of the originating station from the signal control unit of the destination station. The signal control unit 31 of the originating station transmits a bearer setting response signal to the bearer control unit 33 of the originating station. Thereby, the bearer control unit 33 of the originating station operates according to the flowchart of FIG. That is, the bearer control unit 33 confirms a bearer setting response signal from the destination station (step 601), sends a bearer establishment response to the call control unit 32 of the originating station based on the response signal, and indicates that the bearer establishment has been completed. (Step 60)
2).

In step 504, a bearer establishment request is sent from the destination bearer control unit 33 to the call control unit 32 of the same destination. The call control unit 32 of the destination receives this bearer establishment request. Upon receipt, first, a bearer establishment instruction is confirmed according to the flowchart shown in FIG.
1), the setting information of the bearer is taken out, combined with the information in the IAM received from the information storage unit, and the IAM is edited;
An IAM transmission request is sent to the destination station or the destination terminal to the destination signal control unit.

Thereafter, as in the case of the conventional call processing method and the conventional call processing system, the called station or the called terminal sends a call to the calling station.
After the ACM (Address Complete Message) is transmitted to indicate to the originating exchange that information necessary for receiving a call to the destination station or the destination terminal has been received, etc., the AN
M (ANswer Message: response message) is transmitted, indicating that the connection of the communication line to the calling station has been completed. Thereafter, communication is performed. The above is the case of the bearer forward direction setting shown in FIG.

As described above, according to the present embodiment, by checking the connection state of the destination station, it is possible to make a selection conscious of the service using the form of the destination terminal or connection network and the bearer characteristics. The bearer can be freely set from the call processing information obtained by the call control.

The present invention is not limited to the above embodiment. For example, as shown in the sequence diagram of FIG. It is also possible to set a bearer reverse direction in which the bearer setting is transmitted immediately. In this case, it is an effective means since there is no need for an IAM response.

[0036]

As described above, according to the present invention,
By making the call control and the bearer control independent, the connection state of the destination obtained by the call control can be confirmed and the bearer can be set freely.

Further, according to the present invention, the connection state of the destination is confirmed and the bearer can be selected, so that the bearer can be selected in consideration of the service using the connection state of the destination and the bearer characteristics. For example, if the connected subscriber is AT
If it is in the M network, ATM can be selected as the bearer, which allows the bearer from the originating station to the destination to be A
One type of TM can be used, which eliminates the need for protocol conversion processing.

Further, according to the present invention, it is possible to establish a bearer in a direction opposite to the call direction with respect to the establishment direction of the bearer. In this case, an IAM response can be made unnecessary and quick call processing can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of a call control unit of an originating station when receiving an IAM according to the present invention.

FIG. 3 is a flowchart for explaining an operation of terminating a terminal at the time of IAM reception in the present invention.

FIG. 4 is a flowchart for explaining the operation of a call control unit of a calling station when an IAM response signal is received in the present invention.

FIG. 5 is a flowchart for explaining the operation of a bearer control unit of an originating station when a bearer establishment request is received in the present invention.

FIG. 6 is a flowchart for explaining the operation of the bearer control unit at the destination when receiving a bearer setting request in the present invention.

FIG. 7 is a flowchart for explaining the operation of a bearer control unit of an originating station upon receiving a bearer setting response in the present invention.

FIG. 8 is a flowchart for explaining the operation of the call control unit of the destination station when a bearer establishment instruction is input in the present invention.

FIG. 9 is a sequence diagram of each example between a source station and a destination station in the present invention.

FIG. 10 is a block diagram of an example of a conventional main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Switchboard (NW) 15 Subscriber 30 Central control unit 31 Signal control unit 32 Call control unit 33 Bearer control unit 34 Information storage unit

Claims (9)

[Claims] 1. A call processing method for performing a call process of an originating and terminating exchange connected to another network or a subscriber terminal, the originating station being based on information from a caller to the originating station, A first step of deciding a destination and transmitting an address signal including connection form information of a destination to the destination; and the destination determined by the first step is the address from the source. A second step of receiving a signal and determining a destination based on the address signal; and a third step in which the destination selects a bearer type according to a connection mode of the destination determined in the second step. And a fourth step of transmitting a response signal including the bearer type information selected in the third step from the destination to the source.
The transmitting station receives the response signal, performs the bearer setting of the bearer type information included in the received signal by the call control unit of the transmitting station, and outputs the establishment request of the set bearer type. A fifth step of: confirming the bearer type in the establishment request, performing a setting for bearer establishment by the bearer control unit of the source station, and transmitting a bearer setting request to the destination station. And the receiving station receives the bearer setting request, sets a bearer based on the bearer set by the calling station from the received signal, and sets the address signal from the receiving station to the destination by the bearer establishment. And transmitting an bearer setting response signal to the source station, and an eighth step in which the source station receives the bearer setting response signal and performs a bearer establishment response. A call processing method comprising: 2. A call processing method for performing call processing for a calling station and a destination exchange connected to another network or a subscriber terminal, wherein the calling station is configured to perform the call processing based on information from a calling party to the calling station. A first step of deciding a destination and transmitting an address signal including connection form information of a destination to the destination; and the destination determined by the first step is the address from the source. A second step of receiving a signal and determining a destination based on the address signal; and a third step in which the destination selects a bearer type according to a connection mode of the destination determined in the second step. A fourth step of performing the bearer setting of the bearer type information selected in the third step by the call control unit of the destination station, and outputting an establishment request of the set bearer type; The bearer species of The fifth step of performing a setting for bearer establishment by the bearer control unit of the destination station and transmitting a bearer setting request to the source station, and the source station receives the bearer setting request. Performing a bearer setting based on the bearer set at the destination from the received signal, transmitting the address signal from the source to the destination by establishing a bearer, and transmitting a bearer setting response signal to the destination. A call processing method comprising: a sixth step of transmitting; and a seventh step in which the destination receives the bearer setting response signal and performs a bearer establishment response. 3. The first step includes transmitting the address signal to the destination determined based on information from the calling party to the calling station, and transmitting bearer information used by the calling party. 3. The call processing method according to claim 1, wherein the bearer information is acquired and stored in the information storage unit as a default value of the bearer setting. In the third step, when the destination is a station on another network, the destination is selected as a bearer type corresponding to a line type connected to a station on another network, and the destination is 3. The call processing method according to claim 1, wherein when the subscriber terminal is a subscriber terminal, a bearer of a bearer service subscribed to by the subscriber terminal is selected. 5. In the third step, when the destination is a subscriber terminal not subscribed to a bearer service, no bearer type is selected. 4. The bearer setting according to claim 3, wherein when the bearer type information included in the response signal does not indicate a bearer type, a bearer setting is performed using a default value of the bearer setting stored in the information storage unit. Call processing method. 6. A call processing system for performing call processing of an originating and terminating exchange connected to another network or a subscriber terminal, the originating station comprising: a first signal control unit for transmitting and receiving a control signal; A first information storage unit that stores and reads out call setting information; and determines the destination based on information from a caller input via the first signal control unit, and determines the destination. The first signal control unit outputs an address signal including the connection destination information of the destination, and the bearer of the bearer type information included in the bearer response signal from the destination received by the first signal control unit A first call control unit that performs setting and outputs an establishment request of the set bearer type; and confirms the bearer type in the establishment request, performs setting for bearer establishment, and performs the first signal The control unit sends a bearer setting request. A second signal control unit for transmitting and receiving a control signal; a second information storage unit for storing and reading out call setting information; A destination is determined based on the address signal from the source station received by the signal control unit of (2), a bearer type is selected according to the determined connection mode of the destination, and the address signal is determined by a bearer establishment instruction. A second call control unit that causes the second signal control unit to output a call to the destination, and starts a bearer setting based on the bearer setting request from the calling station received by the second signal control unit And performing a bearer establishment instruction after the completion of the setting, and outputting the bearer setting response signal from the second signal control unit.
And a bearer control unit. 7. A call processing system for performing call processing of an originating and terminating exchange connected to another network or a subscriber terminal, the originating station comprising: a first signal control unit for transmitting and receiving a control signal; A first information storage unit that stores and reads out call setting information; and determines the destination based on information from a caller input via the first signal control unit, and determines the destination. The first signal control unit outputs an address signal including the connection type information of the destination to the bearer set at the destination based on the bearer setting request from the destination received by the first signal control unit. The first call control unit that performs the setting of the bearer based on, and outputs the establishment request of the set bearer type, and confirms the bearer type in the establishment request, performs the setting for bearer establishment, Bearer setting from first signal control unit A first bearer control unit for transmitting an answer signal and outputting the address signal to the destination, wherein the destination station transmits and receives a control signal, a second signal control unit, and call setting information. And a second information storage unit that reads and determines a destination based on the address signal from the source station received by the second signal control unit, and determines a connection form of the determined destination. In response, a bearer type is selected, a bearer setting of the selected bearer type information is performed, and a second call control unit that outputs a request for establishing the set bearer type, and the bearer type in the establishment request A call processing system comprising: a second bearer control unit that confirms and sets up a bearer, and transmits a bearer setting request from the second signal control unit to the calling station. 8. The first call control unit acquires bearer information used by the caller based on information from the caller to the calling station, and stores the bearer information in the first information storage. The second call control unit, when the destination is a station of another network, as a bearer type corresponding to the line type connected to the station of the other network. 8. The call processing system according to claim 6, wherein, when the selection is made and the destination is the subscriber terminal, a bearer of a bearer service contracted by the subscriber terminal is selected. 9. The second call control unit does not select a bearer type when the destination is a subscriber terminal that has not subscribed to a bearer service. When the bearer type information included in the bearer response signal received by the first signal control unit does not indicate a bearer type, the bearer setting is performed according to the default value of the bearer setting stored in the first information storage unit. 9. The call processing system according to claim 8, wherein a request for establishing a bearer is made to the first bearer control unit after performing the above.