JP6623669B2 - Communication device, communication program, communication method, and communication system - Google Patents

Description

  The present invention relates to a communication device, a communication program, a communication method, and a communication system, and can be applied to, for example, a communication system including a communication device that accommodates a telephone terminal via a subscriber line.

  For example, an access gateway device (hereinafter, referred to as "AGW") accommodates a subscriber telephone terminal (hereinafter, referred to as "telephone terminal") connected to an analog line or an ISDN line, and is connected to an IP network. A VoIP service is provided to an accommodated telephone terminal by transmitting and receiving a call control signal in accordance with a call control protocol such as SIP (Session Initiation Protocol) with a call agent (hereinafter, referred to as “CA”). ing.

  FIG. 2 is a flowchart showing a call connection process at the time of an incoming call to a telephone terminal according to the SIP.

  In FIG. 2, when there is an incoming call to a telephone terminal connected to an analog line or an ISDN line, CA2 transmits Initial INVITE to AGW 9 (S91). Here, the called number of the destination, the calling number of the caller, and the like are set in Initial INVITE.

  The AGW 9 specifies information (for example, a subscriber line number (telephone number)) on the line of the destination telephone terminal 5 based on the called number set in the Initial INVITE received from the CA 2, and The incoming call is made to the telephone terminal 5 (S92).

  At this time, the AGW 9 specifies the line information of the destination, but cannot notify the CA 2 of the line information. Also, for example, when a call cannot be received or a call is disconnected due to a line failure of an analog line or an ISDN line, the AGW 9 notifies a message including a SIP status code to the CA 2 (see FIG. 2, S93, S95). , ITU-T Recommendation Q. Although the reason display value in 850 can be notified to CA2, the AGW 9 cannot notify CA2 of the cause of the failure to receive the call or the cause of the disconnection.

  The CA2 records the collected detailed call information in a call detail information recording unit (CDR; Call Detail Recorder). For example, when a failure occurs in the analog line or the ISDN line accommodated in the AGW 9, the cause of the failure is CA2 searches for the detailed call information with reference to the CDR by an operation of a maintenance person or the like in order to analyze.

JP 2006-229820 A

  However, as described above, in the conventional call connection processing based on SIP, line information such as an analog line or an ISDN line or a disconnection factor cannot be notified to the CA. Cannot be recorded.

  That is, the line information and the cause of the failure cannot be mapped and recorded on the detailed call information, and the line information and the cause of the failure cannot be specified by referring to the CDR. Therefore, in order to analyze the line information and the cause of the failure, for example, a maintenance person needs to directly refer to log information and the like recorded in an AGW located remotely from the CA, and the maintenance burden is large. In addition, it may take a long time.

  Therefore, it is possible to notify the CA which is the call control server of the line information and the disconnection factor of the source or the destination, and to record the line information and the disconnection factor in the call detailed information recording unit as the detailed call information, There is a need for a communication device, a communication program, a communication method, and a communication system capable of confirming line information at the time of call connection and a factor at the time of call disconnection from detailed information.

In order to solve such a problem, a communication device according to a first aspect of the present invention is a communication device that relays a call control signal between an accommodated telephone terminal and a call control server. Or, line information specifying means for specifying subscriber line information of a telephone terminal to be called, (2) message generating means for generating a message including subscriber line information, and (3) call control including the generated message Communication processing means for transmitting a signal to the call control server ; and (4) disconnection factor detection means for detecting a disconnection factor of the call connected to the telephone terminal , wherein the message creation means is detected by the disconnection factor detection means. A message including the disconnection factor information is generated, and the communication processing unit transmits a call control signal including the generated message to the call control server .

A communication program according to a second aspect of the present invention is a communication program for a communication device that relays a call control signal between an accommodated telephone terminal and a call control server. Line information specifying means for specifying the subscriber line information of the telephone terminal, (2) message generating means for generating a message including the subscriber line information, and (3) a call control signal including the generated message. and communication processing means for transmitting the call control server, to function as a cutting factor detecting means for detecting the disconnection factor calls are connected (4) telephone terminal, the message creating means is detected by the cutting factor detecting means A message including the disconnection factor information is generated, and the communication processing unit transmits a call control signal including the generated message to the call control server .

A communication method according to a third aspect of the present invention provides a call control server, call detail information recording means for recording call detail information acquired from the call control server, and a call between the housed telephone terminal and the call control server. In a communication method executed by a communication device that relays a control signal, the communication device specifies (1) subscriber line information of the telephone terminal as a source or destination, and (2) converts the subscriber line information to (3) transmitting a call control signal including the generated message to the call control server, (4) detecting a disconnection factor of the call to which the telephone terminal is connected, and (5) detecting the disconnection factor. A message including disconnection factor information is created, (6) a call control signal including the created message is transmitted to the call control server, and ( 7 ) the call control server transmits the subscriber line included in the message received from the communication device. Call details Characterized by recording the call detail information recording means as a broadcast.

A communication system according to a fourth aspect of the present invention comprises a call control server, call detail information recording means for recording call detail information obtained from the call control server, and a call between the housed telephone terminal and the call control server. A communication device for relaying a control signal, the communication device comprising: line information specifying means for specifying subscriber line information of a telephone terminal to be a source or a destination; and a message creation for creating a message including subscriber line information a means, a communication processing means for transmitting a call control signal to the call control server including messages created, and a cutting factor detecting means for detecting the disconnection factor call telephone terminal is connected, the message creating means but creates a message containing the cleavage factor information detected by the cutting factor detecting means, the communication processing means transmits the call control signal including the created message to the call control server, a call control Over server, characterized in that to record the call detail information recording means subscriber line information contained in the message received from the communication apparatus as the call detail information.

  According to the present invention, it is possible to notify the call control server of the line information and the disconnection factor of the source or destination, it is possible to record the line information and the disconnection factor as detailed call information in the call detail information recording unit, From the detailed call information, the line information at the time of call connection and the factor at the time of call disconnection can be confirmed.

FIG. 2 is an internal configuration diagram illustrating an internal configuration of the AGW according to the embodiment. It is a flowchart which shows the call connection process regarding the incoming call to the telephone terminal according to SIP. 1 is an overall configuration diagram illustrating an overall configuration of a voice communication system according to an embodiment. FIG. 3 is a configuration diagram illustrating a configuration of a message creation table according to the embodiment. FIG. 3 is a block diagram illustrating a detailed configuration of a CA and a call detail information recording unit according to the embodiment. FIG. 4 is a configuration diagram illustrating a configuration of line information and disconnection factor information recorded in a detailed call information recording unit according to the embodiment. FIG. 4 is a sequence diagram showing a call connection at the time of an incoming call to a telephone terminal accommodated by the AGW. FIG. 4 is a sequence diagram showing a call connection when a telephone terminal accommodated in the AGW makes a call.

(A) Main Embodiment Hereinafter, embodiments of a communication device, a communication program, a communication method, and a communication system of the present invention will be described in detail with reference to the drawings.

  This embodiment exemplifies a case where the present invention is applied to a voice communication system employing SIP.

(A-1) Configuration of Embodiment FIG. 3 is an overall configuration diagram showing an overall configuration of a voice communication system according to the embodiment.

  3, an audio communication system 10 according to the embodiment includes an access gateway device (AGW) 1 as a communication device, a call agent (CA) 2 as a call control server, a call detail information recording unit 3, a telephone terminal 5 (5 -1 to 5-n; n is a positive integer).

  The AGW 1 is connected to a subscriber telephone line 6 such as an analog line or an ISDN line, accommodates one or a plurality of telephone terminals 5, and connects to the IP network 4. The AGW 1 transmits and receives a call control signal (control message) according to the SIP to and from the CA 2 on the IP network 4 to provide a VoIP service to the telephone terminal 5 accommodated therein, and performs the call of the telephone terminal 5. Establish.

  The AGW 1 may directly accommodate the telephone terminal 5 via the subscriber telephone line 6, or may interpose a PBX (for example, a private branch exchange) between the telephone terminal 5 and the telephone terminal 5 through the PBX. May be accommodated, or a combination of the direct accommodation of the telephone terminal 5 and the accommodation via the PBX may be used. That is, the AGW 1 may be any of direct accommodation of analog lines, accommodation of ISDN lines, and mixed accommodation of analog lines and ISDN lines.

  CA2 is a SIP server that performs call control in order to establish a call between a calling telephone terminal and a called telephone terminal. The CA 2 is connected to the call detail information recording unit 3 and records detailed information (call detail information) on the call processing executed by the CA 2 in the call detail information recording unit 3.

  The detailed call information recording unit 3 is connected to the CA 2 and records the detailed call information of each session based on the detailed information on the call from the CA 2.

  The telephone terminal 5 is a subscriber telephone connected to the subscriber telephone line 6, and is, for example, an analog telephone or a digital telephone.

  FIG. 1 is an internal configuration diagram illustrating an internal configuration of the AGW 1 according to the embodiment. 1, the AGW 1 includes a control unit 11, a subscriber-side interface unit 12, a network-side interface unit 13, a communication processing unit 14, and a storage unit 15.

  The subscriber interface unit 12 is connected to the subscriber telephone line 6 to exchange signals with the subscriber terminals 5-1 to 5-n.

  The network-side interface unit 13 connects to the IP network 4 and transmits / receives a packet including a SIP message to / from the CA 2.

  The control unit 11 is a processing unit or device that controls the function of the AGW 1. The control unit 11 realizes the function of the AGW 1 by executing a processing program stored in the storage unit 15 such as a ROM, for example.

  When the telephone terminal 5 accommodated in the AGW 1 is the transmission source, the control unit 11 converts the DTMF signal (Dial Tone Multi Frequency) acquired from the telephone terminal 5 via the subscriber telephone line 6 into a called number according to the VoIP telephone system. And a call request message (Initial INVITE message) including the called number is created according to the SIP. Further, the control unit 11 specifies the subscriber telephone line 6 of the destination telephone terminal 5 based on the called number included in the outgoing call request message (Initial INVITE message) received from the CA 2 via the IP network 4, A calling signal (DTMF signal) is transmitted to the telephone terminal 5 through the subscriber telephone line 6.

  As shown in FIG. 1, the control unit 11 includes a line information specifying unit 111, a disconnection factor detecting unit 112, and a message creating unit 113.

  When the accommodated telephone terminal 5 is the transmission source, the line information identification unit 111 detects an off-hook state of the telephone terminal 5 through the subscriber telephone line 6 and connects to the transmission telephone terminal 5. Information on the subscriber telephone line 6 (hereinafter, also referred to as “line information”) is specified. When the accommodated telephone terminal 5 is the destination, the line identification unit 111 determines the line information of the destination telephone terminal 5 based on the called number included in the received outgoing call request message (Initial INVITE message). To identify.

  Here, for example, in the case of a V5.2 ISDN line, the line information includes an EF address, a user port B channel, a V5.2 bearer channel, a C channel time slot, and the like. For example, in the case of a V5.2 analog line, the line information includes an L3 address, a V5.2 bearer channel, a C channel time slot, and the like. Further, for example, when the AGW 1 directly accommodates a telephone terminal, the line information includes a line accommodation position and the like.

  The disconnection factor detection unit 112 detects a disconnection factor of the call of the telephone terminal 5 to be accommodated.

  The disconnection factor detection unit 112 detects a timeout of a timer, for example, when the destination telephone terminal 5 does not respond to an incoming call, or detects disconnection of a call by detecting, for example, an on-hook state of the telephone terminal 5 by a user operation. Or detect.

  Further, for example, the disconnection factor detection unit 112 detects a disconnection of a call due to a resource abnormality of the AGW 1. As a method of the disconnection factor due to the resource abnormality, for example, by comparing the number of used channels assigned to AGW1 with a threshold value, it is determined that the disconnection is caused by the fact that the number of used channels of AGW1 exceeds the threshold value. Further, for example, by comparing the CPU usage rate of the AGW 1 with a threshold, it is determined that the disconnection is caused by an increase in the CPU load. Further, for example, when there is an incoming call or an outgoing call from a line that is closed for maintenance among the subscriber lines 6 to which the AGW 1 is connected, it is determined that the disconnection is caused by an outgoing / incoming call from the line that is closed for maintenance. I do.

  The message creating unit 113 creates a SIP message to be exchanged with the CA2. Here, in addition to creating a message to be exchanged for call connection with CA2, message creating section 113 refers to message creation table 151, uses an extended header in the SIP message, and uses line information and disconnection. Create a SIP message containing the factor. The message creation table 151 will be described later in detail.

  The communication processing unit 14 sends and receives SIP messages through the network-side interface unit 13 and sends and receives signals through the subscriber-side interface unit 12 under the control of the control unit 11.

  The storage unit 15 stores a conversion table for specifying a destination telephone number, information on lines such as the line number (telephone number) and line type of the subscriber telephone line 6 to be accommodated, the line type, the accommodation position of the telephone terminal 5, and the call. And the message creation table 151 and the like are stored.

  FIG. 4 is a configuration diagram illustrating a configuration of the message creation table 151 according to the embodiment. 4, the message creation table 151 has a header name, a parameter character string, a parameter name, a notification trigger, and the like.

  The “header name” is the name of an extension header for notifying the CA2 of information about a line and disconnection factor information. For example, in the embodiment, the extension header name is defined as “P-Call-Info”, and the message creation unit 113 provides the extension header “P-Call-Info” in the SIP message to be created to provide information about the line. And a SIP message including a disconnection factor parameter.

  The “parameter character string” is a character string indicating a parameter type of information about a line and disconnection factor information to be notified to CA2. “Parameter name” is the name of each parameter type. The message creation unit 113 converts the corresponding parameter character string into a SIP message based on the information about the source and destination lines detected by the line information detection unit 111 and the disconnection factor detected by the disconnection factor detection unit 112. insert.

  “Notification trigger” defines the timing of setting line information and parameters of a disconnection factor in the extension header “P-Call-Info” and notifying CA2. “Notification trigger” indicates the type of message that AGW1 transmits to CA2. For example, when notifying the CA2 of "parameter character string: calling side Bch information" which is line information when the telephone terminal 5 connected to the ISDN line makes a call using the Bch, the message creation unit of the AGW1 Reference numeral 113 denotes a SIP message in which the extension header “P-Call-Info” of FIG. 4 is set in the corresponding “notification opportunity: Initial INVITE (indicated as“ ini-INV ”in FIG. 4)”. .

  As described above, the message creating unit 113 creates the SIP message including the parameter character strings of the line information and the disconnection factor information at the creation timing of the SIP message defined in “notification trigger”, and sends the SIP message to the communication processing unit 14. give. Thereby, the communication processing unit 14 can transmit the SIP message including the line information and the disconnection factor information created by the message creating unit 113 to the CA 2.

  FIG. 5 is a block diagram illustrating a detailed configuration of the CA 2 and the call detail information recording unit 3 according to the embodiment.

  In FIG. 5, the CA 2 includes a control unit 21, a network-side interface unit 22 for exchanging information with the IP network 4, and a communication processing unit 23 for performing communication processing.

  The control unit 21 creates a call control unit 211 that performs call control according to the SIP and detailed call information that is detailed information regarding a call controlled by the call control unit 211, and stores the detailed call information in the detailed call information recording unit 3. It has a call detail information creation unit 212 for recording.

  Here, the call detail information creation unit 212 sets the calling number and the called number in the call detail information, and sets the call connection state for each session based on the information included in the received SIP message. Further, the detailed call information creating unit 212 sets the line information and the information of the disconnection factor included in the received SIP message in the detailed call information.

  FIG. 6 is a configuration diagram showing a configuration of line information and disconnection factor information recorded in the call detail information recording unit 3 according to the embodiment.

  As shown in FIG. 6, the detailed call information recorded in the detailed call information recording unit 3 is roughly classified into line information and a disconnection factor, and can be recorded as information having a hierarchical structure.

  In the case of a V5.2 ISDN line, the line information is such that the EF address (numerical value 0 to 8175), the user port B channel (numerical value 1 to 383), the V5.2 bearer channel, and the C channel time slot are, for example, “aabbccdee”. Recorded in. Note that “aa” indicates a unit number, “bb” indicates a VoIP-E number, “cc” indicates an E1IF number, “d” indicates an E1 line number, and “ee” indicates a time slot number.

  In the case of a V5.2 analog line, the line information is recorded with an L3 address (numerical value 0 to 32767), a V5.2 bearer channel, and a C-channel time slot, for example, as “aabbccdee”.

  Further, when the AGW 1 directly accommodates the telephone terminal, the line information is recorded such that the line accommodation position is “aabbccdee” or the like.

  As the disconnection factor, a disconnection category indicating the disconnection reason is recorded. For example, “disconnection section; 1” is disconnection due to timer timeout, “disconnection section; 2” is disconnection due to line failure / device failure, “disconnection section; 3” is disconnection by user operation, and “disconnection section; 4”. Is recorded with a number indicating the reason for disconnection, such as disconnection due to a maintenance operation. The cutting section is not limited to that shown in FIG. 6, and can be set as appropriate according to the type and number of cutting reasons.

  Further, as the disconnection factor, detailed information of the disconnection reason for each disconnection section can be recorded in “disconnection reason details”. In the “details of disconnection reason”, for example, information on the date and time when the disconnection occurred can be recorded.

  Note that the line information and disconnection factors recorded as detailed call information in the detailed call information recording unit 3 are displayed on a display or the like of the CA 2 by operation of a maintenance person or the like, similarly to the conventional output of detailed call information. be able to. The display mode is not particularly limited. By forming a hierarchical structure as shown in FIG. 6, information desired by the maintenance person can be displayed.

(A-2) Operation of Embodiment Next, a processing operation of notifying the CA2 of line information and a disconnection factor in the voice communication system 10 according to the embodiment will be described in detail with reference to the drawings.

  FIG. 7 is a sequence diagram showing a call connection at the time of an incoming call to the telephone terminal 5 accommodated in the AGW 1.

  In CA2, when a call arrives at the telephone terminal 5 accommodated in the AGW 1, the call detail information creation unit 212 records the calling number and the called number in the call detail information recording unit 3 (S101). After recording the calling number and the called number in the call detail information recording unit 3, the call control unit 211 of CA2 transmits an Initiation INVITE message to AGW1 (S102). Here, in the initial INVITE transmitted by CA2, the called number is set in Request-URI, and the calling number is set in From.

  When AGW1 receives the initial INVITE from CA2, AGW1 specifies the line accommodated in AGW1 based on the called number set in the received Request-URI, transmits a call signal to telephone terminal 5, and issues an incoming request. Perform (S103).

  In order to notify CA2 that AGW1 has successfully transmitted the call signal, message creating section 113 creates a 180 response message. At this time, the message creation unit 113 acquires the line information of the called party from the line information identification unit 111, and refers to the message creation table 151 to notify the CA2 of the line information. The destination line information is set in the extension header of "P-Call-Info" and notified to CA2 (S104).

  In CA2, call detail information creation section 212 extracts the line information set in P-Call-info of the 180 response message received from AGW1, and sets the line information in call detail information recording section 3 ( S105). At this time, the line information is set in the detailed call information for each corresponding session.

  When the response to the call signal is received from the telephone terminal 5 to the AGW 1 (S106), the message creation unit 113 of the AGW 1 creates a 200 OK message, and the AGW 1 transmits the 200 OK message to the CA 2 (S107). CA2 that has received the 200 OK message returns an ACK response to AGW1 (S108). As a result, the destination telephone terminal 5 is in a call.

  Thereafter, when the call of the telephone terminal 5 is disconnected for some reason, in the AGW1, the disconnection factor detection unit 112 detects the disconnection factor (S109), and refers to the message creation table 151 to notify the CA2 of the disconnection factor. Then, a SIP message is created and transmitted to CA2 (S110). CA2 returns a 200 OK message to AGW1 in response to the received SIP message (S111).

  Here, a method of detecting a disconnection factor by the disconnection factor detection unit 112 will be described. For example, when the AGW 1 receives the initial INVITE from the CA 2, the AGW 1 specifies a line accommodated in the AGW 1 based on the called number set in the received Request-URI, transmits a call signal to the telephone terminal 5, and receives a call. When a request is made (S103), the telephone terminal 5 of the called party does not respond within a predetermined period of time due to counting of the timer, and if a timeout is detected, it is determined that disconnection due to the timer timeout has occurred. Further, for example, the disconnection factor detecting unit 112 monitors a line on which a call is established, and when detecting a call disconnection tone signal or an on-hook state, determines that the call is disconnected by a user operation.

  Further, for example, the disconnection factor detection unit 112 may determine that the number of used lines of the AGW 1 exceeds a preset threshold (number of lines) or that the load of the CPU of the AGW 1 exceeds the preset threshold. In the case where a line failure has occurred, it is determined that the disconnection is due to a line failure or a device failure.

  Further, for example, the disconnection factor detection unit 112 refers to the maintenance information stored in the AGW 1 to determine whether or not the line used by the destination is to be maintained, and the destination line is to be maintained. If the line is blocked, it is determined that the line is disconnected due to a maintenance operation.

  When the disconnection factor detection unit 112 detects the disconnection factor, the message creation unit 113 creates a SIP message in which the disconnection factor parameter detected by the disconnection factor detection unit 112 is set in the extension header (P-Call-Info), Send the SIP message to CA2.

  For example, when disconnecting from the called party, AGW1 sends a BYE message to CA2. At this time, the AGW sets the disconnection factor information to P-Call-Info, in addition to the conventionally set Reason, and notifies the CA2 of the disconnection factor information.

  The CA2 extracts the disconnection factor information set in the P-Call-info of the received SIP message, and sets the disconnection reason and the disconnection factor in the call detail information recording unit 3 (S112). At this time, the line information is set in the detailed call information for each corresponding session.

  For example, upon receiving the BYE message from AGW1, CA2 records the disconnection reason and disconnection factor notified from AGW1 in call detail information recording unit 3. When the disconnection factor information is analyzed after the disconnection of the call, the CA 2 outputs the detailed call information from the detailed call information recording unit 3 (S113).

  Next, a sequence showing a call connection when the telephone terminal 5 accommodated in the AGW 1 makes a call will be described.

  FIG. 8 is a sequence diagram showing a call connection when the telephone terminal 5 accommodated in the AGW 1 originates a call.

  First, when a call request from the telephone terminal 5 that is the caller is given to the AGW 1 (S201), the AGW 1 transmits Initial INVITE to the CA 2 (S202).

  At this time, the AGW 1 sends the called number to the Request-URI of Initial INVITE when the line information specifying unit 111 specifies the line information of the call destination in order to notify the line information of the call source to the CA 2. Then, the calling number (the telephone number of the telephone terminal 5 of the caller) is set in the From, and the line information of the caller is set in the P-Call-Info, and transmitted to the CA2 (S202).

  In CA2, the call detail information creation unit 212 sets the calling number, called number, and transmission destination line information set in the Initial INVITE from the AGW 1 in the call detail information recording unit 3 (S203).

  Although not shown in FIG. 8, CA2 transmits Initial INVITE to the destination. At this time, when the CA 2 receives the SIP message (180 response message) from the destination, the CA 2 sets the line information of the destination included in the 180 response message in the call detail information recording unit 3.

  CA2 transmits the 180 response message received from the destination to AGW1 (S204), and AGW1 that receives the 180 response message transmits a call signal to telephone terminal 5, which is the destination (S205).

  Also, although not shown in FIG. 8, when the called party responds, a 200 OK message is sent from the called party to CA2, and CA2 sends the 200 OK message to AGW1 (S206). Then, AGW1 transmits an ACK message to CA2 (S207). As a result, a call is established between the telephone terminal 5 that is the caller and the called party, and the call starts.

  Thereafter, when the call of the telephone terminal 5 is disconnected due to some factor (S208), in the AGW1, the disconnection factor detection unit 112 detects the disconnection factor, and refers to the message creation table 151 to notify the CA2 of the disconnection factor. Then, a SIP message is created and transmitted to CA2 (S209). CA2 returns a 200 OK message to AGW1 in response to the received SIP message (S210).

  As a method of detecting the disconnection factor by the disconnection factor detection unit 112, a method similar to the method described in S110 of FIG. 7 can be applied, and a detailed description thereof will be omitted. For example, as in S208 in FIG. 8, when the caller's telephone terminal disconnects the call, AGW1 transmits a BYE message to CA2. At this time, the AGW 1 sets the disconnection factor information to P-Call-Info and notifies the CA 2 of the disconnection factor information.

  The CA2 extracts the disconnection factor information set in the P-Call-info of the received SIP message, and sets the disconnection reason and the disconnection factor in the call detail information recording unit 3 (S211). At this time, the line information is set in the detailed call information for each corresponding session.

  Then, when the disconnection cause information is analyzed after the disconnection of the call, the CA 2 outputs the detailed call information from the detailed call information recording unit 3 (S212).

(A-3) Effects of the Embodiment As described above, according to the first embodiment, the AGW can determine only the AGW based on the SIP signal transmitted to the CA by the AGW, the subscriber line information of the ISDN line, and the call. Can be notified, and the CA can be recorded in the CDR as detailed call information. As a result, it is possible to efficiently specify the line information used during the call connection and the cause of the call disconnection.

(B) Other Embodiments The gist of the present invention is that the AGW notifies the CA of the subscriber's line information and the cause of the call disconnection by the SIP signal, and the CA records the information in the CDR.

  In the above-described embodiment, the case where the callee or caller's telephone terminal disconnects the call during the call is illustrated, but the present invention is not limited to this. For example, when the AGW detects an abnormality during the connection processing and disconnects the call, the present invention can be applied to an error response (400 to 699 response) to Initial INVITE.

10 Voice communication system, 1 Access gateway device (AGW), 2 Call agent (CA), 3 Call detail information recording unit (CDR), 4 IP network, 5 (5-1 to 5-n) Phone terminals,
DESCRIPTION OF SYMBOLS 11 ... Control part, 12 ... Subscriber side interface part, 13 ... Network side interface part, 14 ... Communication processing part, 15 ... Storage part, 111 ... Line information identification part, 112 ... Disconnection factor detection part, 113 ... Message creation part ,
21: control unit, 22: network side interface unit, 23: communication processing unit 23, 211: call control unit, 212: call detail information creation unit.

Claims (6)

In a communication device that performs a call control signal relay process between the accommodated telephone terminal and the call control server,
Line information specifying means for specifying subscriber line information of the telephone terminal as a source or a destination,
Message creating means for creating a message including the subscriber line information;
Communication processing means for transmitting a call control signal including the created message to the call control server ;
Disconnection factor detection means for detecting a disconnection factor of a call to which the telephone terminal is connected ,
The message creating means creates a message including disconnection factor information detected by the disconnection factor detecting means,
A communication device, wherein the communication processing means transmits a call control signal including the created message to the call control server . The disconnection factor information is at least one of a disconnection due to a timeout of a timer related to an incoming call response, a disconnection due to a line failure and / or a device failure, a disconnection due to a user operation, or a disconnection due to a maintenance operation. 2. The communication device according to 1. Further comprising a storage means for storing a message creation table that defines a notification trigger of the message including the subscriber line information or the disconnection factor information,
The communication device according to claim 1, wherein the message creating unit creates the message with reference to the message creating table. In a communication program of a communication device that performs a relay process of a call control signal between a housed telephone terminal and a call control server,
Computer
Line information specifying means for specifying subscriber line information of the telephone terminal as a source or a destination,
Message creating means for creating a message including the subscriber line information;
Communication processing means for transmitting a call control signal including the created message to the call control server ;
To function as a cutting factor detecting means for detecting the disconnection factor of calls the telephone terminal is connected,
The message creating means creates a message including disconnection factor information detected by the disconnection factor detecting means,
A communication program , wherein the communication processing means transmits a call control signal including the created message to the call control server . A call control server;
Call detail information recording means for recording call detail information obtained from the call control server,
A communication method executed by a communication device that relays a call control signal between a housed telephone terminal and the call control server,
The communication device is
Identify the subscriber line information of the above-mentioned telephone terminal as a source or destination,
Create a message containing the above subscriber line information,
Transmitting a call control signal including the created message to the call control server;
Detect the disconnection factor of the call connected to the telephone terminal,
Create a message containing the detected disconnection factor information,
Sending a call control signal including the created message to the call control server;
A communication method, wherein the call control server records the subscriber line information included in a message received from the communication device in the call detail information recording means as call detail information. A call control server;
Call detail information recording means for recording call detail information obtained from the call control server,
A communication device for relaying a call control signal between the accommodated telephone terminal and the call control server,
The communication device is
Line information specifying means for specifying subscriber line information of the telephone terminal as a source or a destination,
Message creating means for creating a message including the subscriber line information;
Communication processing means for transmitting a call control signal including the created message to the call control server;
Having a disconnection factor detecting means for detecting a disconnection factor of the call to which the telephone terminal is connected ,
The message creating means creates a message including disconnection factor information detected by the disconnection factor detecting means,
The communication processing means transmits a call control signal including the created message to the call control server,
A communication system, wherein the call control server records the subscriber line information included in a message received from the communication device as detailed call information in the detailed call information recording means.

Images