JP2007019999A - System and method for call termination process selection, user terminal, and exchanging - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a call termination process selection system, a user terminal, an exchange, and a call termination process selection method for making it possible for a user with its own intention to select any communication service in a flexible way, if a call termination of another communication service on the user terminal is generated during the packet communication of the user terminal. <P>SOLUTION: If a user terminal 10 receives a notification that a TV telephone call termination is generated from MSC/GMSC 20 during the time of packet communication, a user selection scene is displayed on a display by a selection unit 11 so as to make the user select TV telephone priority or packet communication priority. If the TV telephone priority is selected, call termination priority units 131, 231 perform call termination process of TV telephone after performing disconnection process of the packet communication. On the other hand, if the packet communication priority is selected, packet communication priority units 132, 232 perform disconnection process of TV telephone call termination and at the same time continue the packet communication. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an incoming call processing selection system, a user terminal, an exchange, and an incoming call processing selection method for performing connection control when another communication service arrives during packet communication.

In addition to the voice call function, mobile phones having packet communication functions such as e-mail and Internet connection have become widespread. In a mobile phone capable of using such a plurality of communication services, incoming calls of other communication services such as incoming voice calls, incoming videophone calls, incoming VoIP (Voice over Internet Protocol), etc. occur during packet communication. There is a case. The following connection control methods exist at that time.
(1) A method that prioritizes packet communication that is currently being communicated and restricts the arrival of other communication services that occur later (2) A multi-call method that uses packet communication and other communication services simultaneously

However, in the system as described above, a user who has received an incoming call cannot select on his own will whether to give priority to packet communication or to receive an incoming call from another communication service. Also, as in (2), when packet communication and other communication services are used simultaneously, it is necessary to establish a radio bearer for each communication service. For this reason, one user occupies many network resources including radio resources, and there is a problem that the network resources cannot be effectively used.
There is also a technique that allows a user to set in advance whether to give priority to voice incoming or packet communication when a voice incoming call occurs during packet communication of a cellular phone (see, for example, Patent Document 1).
JP 2003-219471 A (paragraphs 0029 to 0033)

However, when the technique described in Patent Document 1 is used, a user input for pre-setting is required. In addition, when presetting, the user cannot flexibly select which communication service is prioritized according to the situation at the time of the incoming call or who is the originating user. Further, in Patent Document 1, the mechanism of connection control is not studied, and one user terminal may occupy many network resources.
The present invention has been made in view of the above-described problems, and when an incoming call of another communication service to the user terminal occurs during packet communication of the user terminal, the user can flexibly select his / her own will. It is an object of the present invention to provide an incoming call processing selection system, a user terminal, an exchange, and an incoming call processing selection method that make it possible to select a communication service.

  In order to solve the above-described problem, the invention according to claim 1 is directed to the packet communication or the incoming call when an incoming call of another communication service to the user terminal occurs during the packet communication of the user terminal. A selection unit that allows the user to select whether to prioritize, and when the selection unit selects the priority of the incoming call, the incoming call that performs the incoming process of the other communication service after the disconnection process of the packet communication is performed A priority means, and a packet communication priority means for performing the incoming communication disconnection processing of the other communication service and continuing the packet communication when the priority of the packet communication is selected by the selection means. A feature incoming call processing selection system is provided.

  According to this invention, the incoming call processing selection system allows the user to determine which of the packet communication and the other communication service has priority when an incoming call of another communication service occurs during the packet communication of the user terminal. It will be possible to make flexible selections at will. In addition, no matter which communication service is selected, connection control can be performed so that both transmission paths for packet communication and other communication services are not connected at the same time. It is possible to prevent exclusive use of resources.

  The invention according to claim 2 gives priority to the packet communication or the incoming call when receiving a notification that an incoming call of another communication service to the own terminal has occurred during the packet communication of the own terminal. Selection means for allowing the user to select and a waiting means for waiting for processing related to the incoming call while performing the notification process during the call to the calling side for the incoming call of the other communication service until the selection by the selection means A user terminal is provided.

  According to the present invention, when the user terminal receives a notification that an incoming call of another communication service for the own terminal has occurred during the packet communication of the own terminal, the user terminal determines which of the packet communication and the incoming call has priority. Since the user selects and waits for processing related to the incoming call of another communication service until the selection is made, the user decides whether to give priority to packet communication or another communication service when the incoming call occurs. It becomes possible to select flexibly according to intention.

According to a third aspect of the present invention, in the user terminal according to the second aspect of the present invention, the communication of either the packet communication or the other communication service is connected in accordance with a selection result by the selection unit. Connection control means for performing control is further provided.
According to the present invention, the user terminal performs control so as to connect either one of the packet communication and the other communication service according to the selection result by the selection unit, and therefore does not connect a plurality of communications at the same time. It is possible to prevent the single user terminal from occupying many network resources.

According to a fourth aspect of the present invention, in the user terminal according to the third aspect, the connection control means is configured to disconnect the packet communication when the priority of the incoming call is selected by the selection means. A packet communication disconnection request is transmitted, and after receiving a notification that the packet communication disconnection is completed, an incoming connection response for connecting the transmission path for the other communication service is transmitted.
According to the present invention, since the transmission path for other communication services can be connected after the disconnection of the packet communication is completed, it is possible to prevent one user terminal from occupying many network resources.

According to a fifth aspect of the present invention, in the user terminal according to the third or fourth aspect, the connection control means receives an incoming call of the other communication service when the selection means selects the priority of the packet communication. The packet communication is continued while an incoming call disconnection request for disconnecting is transmitted.
According to the present invention, connection control at the time of packet communication priority can be performed so that the user terminal does not occupy many network resources.

According to a sixth aspect of the present invention, in the user terminal according to the fifth aspect, when the priority of the packet communication is selected by the selection unit, the connection control unit disconnects the incoming call of the other communication service. The reason is transmitted to the originating user terminal.
According to this invention, the originating user can confirm the reason for disconnecting the incoming call, and the convenience for the user can be improved.

According to a seventh aspect of the present invention, there is provided a communication state confirmation unit that confirms a communication state of the user terminal when an incoming communication service is received from the user terminal, Waiting means for waiting for establishment of a transmission path required for connecting the certain communication service when it is confirmed that the packet communication is in progress, and that the arrival of the certain communication service has occurred during the packet communication. Provided is an exchange comprising a notification means for transmitting a notification to the user terminal.
According to the present invention, the user terminal can immediately receive a notification to that effect when an incoming communication service occurs during packet communication, and there is packet communication for the user using the user terminal. It is possible to select which of the incoming communications service is prioritized.

According to an eighth aspect of the present invention, in the exchange according to the seventh aspect, when the user who uses the user terminal selects to prioritize the arrival of the certain communication service, the packet communication disconnection process is performed. It is further characterized by further comprising an incoming call priority unit for performing processing for carrying out an incoming call for the certain communication service after completion.
According to the present invention, since the process for performing the incoming communication service after the completion of the packet communication disconnection process is performed, it is possible to switch from the packet communication to a certain communication service without occupying many network resources.

According to a ninth aspect of the present invention, in the exchange according to the seventh or eighth aspect, when the user who uses the user terminal selects to prioritize the packet communication, the incoming of the certain communication service is received. It further comprises transfer means for transferring the reason for disconnecting the incoming call transmitted from the user terminal at the time of disconnection to the originating user terminal.
According to the present invention, the calling user can know the reason for disconnection of an incoming call of a certain communication service, so that convenience for the user can be improved.

  According to the tenth aspect of the present invention, in the communication state confirmation step in which an exchange confirms the communication state of the user terminal when an incoming communication service occurs for the user terminal, the communication state confirmation step includes: A notification step in which, when it is confirmed that the user terminal is in packet communication, the exchange transmits to the user terminal a notification that an incoming communication service has occurred during packet communication; and Is triggered by the notification in the notification step, the selection step for allowing the user to select which of the packet communication and the incoming call is prioritized, and the packet communication disconnection process according to the selection result in the selection step. An incoming call priority process for performing an incoming process for the certain communication service after the execution, and an incoming call for the certain communication service Providing incoming process selection method characterized by having a connection control step of performing a packet communication priority processing to continue the packet communication, either one of the well as implementing the cutting process.

  According to the present invention, the user can flexibly select which one of packet communication and a certain communication service has priority according to his / her own intention. In addition, no matter which communication service is selected, connection control can be performed so that both transmission paths for packet communication and a certain communication service are not simultaneously connected. It is possible to prevent exclusive use of network resources.

  According to the present invention, when an incoming call of another communication service occurs during the packet communication of the user terminal, the user can flexibly select which of the packet communication and the other communication service is given priority on his / her own will. It becomes possible. In addition, no matter which communication service is selected, connection control can be performed so that both transmission paths for packet communication and other communication services are not connected at the same time. It is possible to prevent exclusive use of resources.

Embodiments of the present invention will be described below with reference to the drawings.
[1. Constitution]
FIG. 1 is a diagram showing an overall configuration of an incoming call processing selection system according to an embodiment of the present invention. As shown in the figure, the incoming call processing selection system includes a user terminal 10 which is a mobile phone used by a user, an MSC / GMSC (Mobile Switching Center / Gateway MSC) 20 for controlling circuit switching, a packet, SGSN / GGSN (Serving GPRS Support Node / Gateway GPRS Support Node) 30 for controlling switching and UTRAN (UMTS Terrestrial Radio Access Network) 40 for controlling wireless communication are configured. .

[1.1. Configuration of user terminal]
Next, the configuration of the user terminal 10 will be described. The user terminal 10 includes hardware (not shown) such as a CPU (Central Processing Unit), a memory, a communication interface, operation keys, a display, and a speaker, and software such as programs and data stored in the memory. The software stored in the memory includes software for performing packet communication and videophone communication, and a program for performing connection control according to the user's selection when an incoming videophone call occurs during packet communication. include.

The functional configuration of the user terminal 10 illustrated in FIG. 2 is realized by these hardware and software included in the user terminal 10. Each function will be described below.
When the selection unit 11 receives a notification from the MSC / GMSC 20 that an incoming videophone call to the user terminal 10 has occurred during the packet communication of the user terminal 10, which of the packet communication and the incoming videophone call has priority? Let the user select Specifically, the selection unit 11 displays a user selection screen on the display and prompts the user to make a selection input. For example, icons indicating the characters “packet communication priority” and “videophone priority” are displayed on the user selection screen, and the user selects one by operating the operation keys. As another method for allowing the user to select which one is given priority, for example, a method of causing the user to operate an operation key according to the voice guidance by outputting voice guidance from a speaker is conceivable.

  The waiting unit 12 waits for a process related to an incoming call while performing a notification process during a call to the calling side for an incoming videophone call until the selection unit 11 selects it. Conventionally, as a process related to an incoming videophone call, a line switching connection process for executing an incoming videophone call upon reception of the incoming videophone call notification has been performed. In the present embodiment, as a process related to the incoming videophone call, one of a packet communication priority process and a videophone incoming call priority process, which will be described later, is executed according to the selection result, triggered by the selection by the selection unit 11. .

The connection control unit 13 performs control so as to connect packet communication or videophone communication according to the selection result by the selection unit 11. The function of the connection control unit 13 will be described in more detail. The connection control unit 13 includes an incoming call priority unit 131 and a packet communication priority unit 132.
The incoming call priority unit 131 performs an incoming call priority process when the selection unit 11 selects that the videophone incoming call is given priority.

  Here, the incoming call priority process performed by the incoming call priority unit 131 will be specifically described below. First, the incoming call priority unit 131 transmits a packet communication disconnection request for executing packet communication disconnection processing to the SGSN / GGSN 30. Thereafter, when a packet communication disconnection response notifying completion of the packet communication disconnection process is received from the SGSN / GGSN 30, the incoming call priority unit 131 performs a circuit switching connection control process for executing a videophone incoming call. Here, the circuit switching connection control process performed by the incoming call priority unit 131 is to connect a transmission line (radio bearer) for videophone communication by transmitting a videophone incoming connection response from the user terminal 10 to the MSC / GMSC20. The process to do. The above is the incoming call priority process performed by the incoming call priority unit 131.

  The packet communication priority unit 132 performs packet communication priority processing when the selection unit 11 selects that the packet communication should be prioritized. Here, the packet communication priority processing performed by the packet communication priority unit 132 is performed at the same time as transmitting a videophone incoming call disconnection request for disconnecting a videophone incoming call from the user terminal 10 to the MSC / GMSC20. This is processing for continuing the packet communication as it is.

  In addition, the packet communication priority unit 132 includes a calling user notification function 133. The calling user notification function 133 notifies the calling user terminal (not shown) of the reason for disconnecting the incoming videophone call. The message content of the reason for disconnection is “Videophone call could not be received because of packet communication”, “Videophone call was disconnected because packet communication priority was selected”, “Packet communication priority” Etc. are considered. In the present embodiment, the calling-side user notification function 133 includes this disconnection reason in the videophone incoming call disconnection request and transmits it to the MSC / GMSC20, and notifies the calling-side user terminal of the disconnection reason via the MSC / GMSC20. .

[1.2. Configuration of MSC / GMSC]
Next, the configuration of the MSC / GMSC 20 will be described. The MSC / GMSC 20 is an exchange having a function of performing line switching of a videophone. The MSC / GMSC 20 includes hardware such as a CPU, a storage device, and a communication interface, and software stored in the storage device, and has the same configuration as a general computer. Software stored in the storage device includes a program for confirming the packet communication state of the user terminal 10 when a videophone call is received to the user terminal 10, and notifies the user terminal 10 that a videophone call has been received during packet communication. A program for performing connection, a program for performing connection control, and the like.

The functional configuration shown in FIG. 3 is realized in the MSC / GMSC 20 by these hardware and software included in the MSC / GMSC 20. Each function will be described below.
The packet status confirmation unit 21 receives a videophone call to the user terminal 10 from a not-shown calling user terminal via a calling-side exchange (not shown) (when an incoming call to the user terminal 10 occurs). ), The packet communication state of the user terminal 10 is confirmed by making an inquiry to the SGSN / GGSN 30.

When the packet status confirmation unit 21 confirms that the user terminal 10 is in packet communication, the waiting unit 24 waits for establishment of a radio bearer necessary for connecting a videophone.
When the packet status confirmation unit 21 confirms that the user terminal 10 is in packet communication, the notification unit 22 transmits a notification to the user terminal 10 that an incoming videophone call has occurred during packet communication. In the present embodiment, the notification unit 22 transmits information indicating that the packet communication state of the user terminal 10 is in packet communication to the user terminal 10 by including in the videophone incoming call notification.

The connection control unit 23 performs connection control for packet communication and videophone communication. The function of the connection control unit 23 will be described in detail. The connection control unit 23 includes an incoming call priority unit 231 and a packet communication priority unit 232.
The incoming call priority unit 231 performs incoming call priority processing when a user who uses the user terminal 10 selects to give priority to the videophone.

  Here, the incoming call priority process performed by the incoming call priority unit 231 will be specifically described below. First, after the packet communication disconnection process is completed, the incoming call priority unit 231 performs a circuit-switched connection control process for performing an incoming videophone call. Here, the circuit switching connection control processing performed by the incoming call priority unit 231 refers to processing for connecting a transmission line for videophone communication by instructing the establishment of the transmission line. The completion of the packet communication disconnection process can be recognized by receiving a videophone incoming call connection response from the user terminal 10.

After the completion of the line connection control process, the incoming call priority unit 231 performs videophone communication between the calling user terminal and the called user terminal 10 by returning a videophone incoming call connection response to the calling exchange. Let it begin. The above is the incoming call priority process performed by the incoming call priority unit 231.
The packet communication priority unit 232 performs packet priority processing when a user using the user terminal 10 selects to prioritize packet communication. Specifically, the packet communication priority unit 232 disconnects the incoming videophone call based on the incoming videophone call disconnection request received from the user terminal 10 and then transmits a videophone incoming call disconnection notice to the originating exchange.
Further, the packet communication priority unit 232 includes a transfer function 233. The transfer function 233 transfers the reason for disconnecting the incoming videophone call transmitted from the user terminal 10 to the originating user terminal.

[2. Operation]
Next, an operation example of the incoming call processing selection system having the above configuration will be described.
[2.1. Incoming call processing]
First, with reference to FIG. 4, processing upon incoming videophone call to the user terminal 10 will be described.
First, the user terminal 10 is in the middle of performing packet communication via the SGSN / GGSN 30 (step S1). At this time, when the MSC / GMSC 20 receives an incoming videophone call to the user terminal 10 transmitted from a not-shown originating user terminal (step S2), the packet status confirmation unit 21 of the MSC / GMSC 20 receives the SGSN / GGSN 30 Is inquired of the packet communication state of the user terminal 10. The SGSN / GGSN 30 confirms the packet communication state of the user terminal 10 that has received an inquiry from the MSC / GMSC 20, and returns a confirmation result to the MSC / GMSC 20 (step S3).

  The packet state confirmation unit 21 of the MSC / GMSC 20 that has received the response confirms whether or not the user terminal 10 is performing packet communication. As a result, when it is confirmed that the user terminal 10 is in packet communication, the waiting unit 24 waits for establishment of a radio bearer necessary for connecting the videophone, and the notifying unit 22 A videophone call notification including information indicating that the packet communication state of the packet communication is in progress is transmitted to the user terminal 10 (step S4).

  Based on the notification from the MSC / GMSC 20, the user terminal 10 recognizes that an incoming videophone call to the own terminal 10 has occurred during the packet communication of the own terminal 10. The selection unit 11 displays a user selection screen on which “packet communication priority” and “videophone priority” are displayed on the display of the user terminal 10 (step S5). The queuing unit 12 performs the incoming videophone call while performing the notification process during the call to the calling side until the user selects either “packet communication priority” or “videophone priority” on the user selection screen. Wait for processing related to.

[2.2. Videophone priority processing]
Next, with reference to FIG. 5, the videophone priority process performed by the incoming call process selection system will be described.
When the user selects “videophone priority” on the user selection screen in step S5 described above (step S11), the incoming call process selection system executes an incoming call priority process.
Specifically, first, the incoming call priority unit 131 of the user terminal 10 sends a packet communication disconnection request to the SGSN / GGSN 30 (step S12). The SGSN / GGSN 30 receives the packet communication disconnection request from the user terminal 10 and performs a process for disconnecting the packet communication. The SGSN / GGSN 30 transmits a packet communication disconnection response to the user terminal 10 in order to notify the user terminal 10 that the disconnection of the packet communication has been completed (step S13).

  When receiving the packet communication disconnection response from the SGSN / GGSN 30, the incoming call priority unit 131 of the user terminal 10 starts the circuit switching connection control process. Specifically, the incoming call priority unit 131 returns a videophone incoming call connection response for responding to the videophone incoming call notification transmitted to the terminal 10 in step S4 described above to the MSC / GMSC 20 (step S14).

The MSC / GMSC 20 that has received the incoming videophone call connection response performs a radio bearer establishment process between the UTRAN 40 and the user terminal 10 by instructing establishment of a circuit-switched radio bearer (step S15). Connect the transmission path for incoming calls. Thus, the line connection control process is completed.
The incoming call priority unit 231 of the MSC / GMSC 20 transmits a videophone incoming call connection response to the calling user terminal after completion of the line connection control process (step S16). As a result, the videophone communication between the calling user terminal and the called user terminal 10 is started.

[2.3. Packet communication priority processing]
Next, packet communication priority processing performed by the incoming call processing selection system will be described with reference to FIG.
When the user selects “packet communication priority” on the user selection screen in step S5 described above (step S21), the packet communication priority unit 132 of the user terminal 10 receives the videophone call including the reason for disconnecting the videophone call. A disconnection request is sent to the MSC / GMSC 20 (step S22).

The packet communication priority unit 232 of the MSC / GMSC 20 transmits a videophone incoming call disconnection notification including the reason for disconnection of the videophone incoming call received from the user terminal 10 to the originating user terminal (step S23). The originating user terminal displays the received disconnect reason on, for example, a display. Thereby, the originating user can recognize the reason for disconnection.
The packet communication priority unit 132 of the user terminal 10 continues the packet communication (step S24).

  As described above, even if the user prioritizes which communication service to prioritize, the user responds to his / her will when a videophone call arrives during packet communication of the user terminal 10. Therefore, any communication service can be selected flexibly, and convenience is improved. In addition, since multi-call is not used, it is possible to prevent one user terminal 10 from occupying a large amount of network resources such as radio resources, and it is possible to effectively use network resources. Moreover, since the disconnecting user is notified of the reason for disconnection, convenience can be improved.

[3. Modified example]
Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and various modifications can be made within the scope of the technical idea. As modifications, for example, the following can be considered.
(1) In the above-described embodiment, the case where a videophone call is received to the user terminal 10 during the packet communication of the user terminal 10 has been described. However, the type of communication service to be received is limited to the videophone. Absent. For example, incoming calls of various types of communication services such as voice incoming calls, VoIP incoming calls, and the like that require the user to respond in real time can be considered. When a videophone call is replaced with another communication service call, the MSC / GMSC 20 in the above-described embodiment is replaced with an exchange having a function for controlling connection of the other communication service, thereby receiving another communication service call. Can be realized.

(2) In the above-described embodiment, the user terminal 10 has been described as a mobile phone. However, the terminal is capable of receiving both packet communication and other communication services that are received during packet communication. For example, PHS (Personal Handyphone System) and PDA (Personal Digital Assistance) may be used.

  It can be used for user terminals that can be provided with multiple communication services such as videophone and packet communication. When other communication services arrive during packet communication, network resources are not occupied. It can be used in the communication service industry that provides an appropriate communication service according to the user's selection.

It is a figure which shows the whole structure of the incoming call process selection system which concerns on embodiment of this invention. It is a figure which shows the function structure of the user terminal which concerns on the same embodiment. It is a figure which shows the function structure of MSC / GMSC which concerns on the same embodiment. It is a figure which shows the procedure of the process at the time of the incoming call based on the embodiment. It is a figure which shows the procedure of the video telephone priority process which concerns on the embodiment. It is a figure which shows the procedure of the packet communication priority process which concerns on the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 User terminal 11 Selection part 12 Waiting part 13 Connection control part 131 Incoming priority part 132 Packet communication priority part 133 Originating side user notification function 20 MSC / GMSC
21 Packet status confirmation unit 22 Notification unit 23 Connection control unit 24 Waiting unit 231 Arrival priority unit 232 Packet communication priority unit 233 Transfer function 30 SGSN / GGSN

Claims (10)

Selection means for allowing the user to select which of the packet communication and the incoming call has priority when an incoming call of another communication service to the user terminal occurs during the packet communication of the user terminal;
When the priority of the incoming call is selected by the selection means, the incoming call priority means for performing the incoming process of the other communication service after performing the packet communication disconnection process;
A packet communication priority means for performing the incoming communication disconnection process of the other communication service and continuing the packet communication when the priority of the packet communication is selected by the selection means. Processing selection system. A selection unit that allows the user to select which of the packet communication and the incoming call has priority when receiving a notification that an incoming call of another communication service for the own terminal has occurred during the packet communication of the own terminal;
A user terminal comprising: a waiting unit that waits for a process related to an incoming call while performing a notification process during a call to the calling party for an incoming call of the other communication service until the selection by the selection unit. The connection control means for performing control so as to connect either one of the packet communication and the other communication service according to a selection result by the selection means. User terminal. The connection control means includes
When the priority of the incoming call is selected by the selection means,
Sending a packet communication disconnection request for disconnecting the packet communication;
The user terminal according to claim 3, wherein after receiving a notification that the packet communication disconnection has been completed, an incoming connection response for connecting the transmission path for the other communication service is transmitted. The connection control means includes
When the priority of the packet communication is selected by the selection means,
5. The user terminal according to claim 3, wherein an incoming call disconnection request for disconnecting an incoming call of the other communication service is transmitted and the packet communication is continued. The connection control means includes
When the priority of the packet communication is selected by the selection means,
The user terminal according to claim 5, wherein the reason for disconnecting the incoming call of the other communication service is transmitted to the user terminal on the originating side. A communication status confirmation means for confirming the communication status of the user terminal when an incoming call of a certain communication service occurs for the user terminal;
When it is confirmed by the communication state confirmation means that the user terminal is in packet communication, waiting means for waiting for establishment of a transmission path necessary for connecting the certain communication service;
An exchange comprising: notification means for transmitting to the user terminal that a certain communication service has been received during packet communication. Incoming priority for performing a process for receiving an incoming communication service after completion of the packet communication disconnection process when the user using the user terminal selects to prioritize the incoming communication service. The exchange according to claim 7, further comprising means. When the user using the user terminal selects to prioritize the packet communication, the calling user is notified of the reason for disconnecting the incoming call transmitted from the user terminal when the incoming communication service is disconnected. The exchange according to claim 7 or 8, further comprising transfer means for transferring to a terminal. A communication state confirmation step in which an exchange confirms a communication state of the user terminal when an incoming communication service is received for the user terminal;
When it is confirmed in the communication state confirmation step that the user terminal is in packet communication, the exchange transmits a notification to the user terminal that an incoming communication service has occurred during packet communication. A notification step;
A selection step for allowing the user to select which one of the packet communication and the incoming call is prioritized by the notification in the notification step by the user terminal;
In accordance with a selection result in the selection step, an incoming call priority process for performing an incoming process of the certain communication service after performing a disconnection process of the packet communication, an incoming call disconnecting process of the certain communication service, and the packet A packet communication priority process for continuing communication; and a connection control step for executing any one of the packet communication priority processes.

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