JP5353773B2 - RTP data communication device - Google Patents

Description

  The present invention relates to an RTP data communication apparatus that communicates RTP (Real-time Transport Protocol) data with a communication apparatus via a communication network.

  2. Description of the Related Art Conventionally, in a device that communicates RTP data via a communication network such as VoIP (Voice over Internet Protocol), as a method for detecting an abnormality in an IP network or a communication device on the other side after an RTP session is established, RTP or RTCP (Real-time) The following methods for monitoring a stream of time transport control protocol are known. For example, when a reception state of an RTP stream in a communication session between communication devices is monitored and it is detected that the stream has not been received for a certain period of time, a communication device failure or communication network failure occurs on the other side. Is reported in the RTP / RTCP Timeout section of RFC 3660 Chapter 2.10 RTP Package defined by the Internet Standardization Organization IETF (The Internet Engineering Task Force). ing. In addition, RTCP packets periodically transmitted from the communication device on the other side are received, the occurrence of disconnection of the RTP session is detected from the reception status, and information on the occurrence of a failure such as a failure of the communication device on the other side is connected to the call. A method for notifying the control device is disclosed in Patent Document 1, for example.

JP 2007-212217 A

  As described above, in the case of the configuration of the conventional communication device, it is necessary to have an RTP stream reception monitoring function and an RTCP packet transmission function to the counterpart device. It does not necessarily have such a function. When such a function is not provided, the following problems occur. During normal operation, there is no problem because the communication device on the transmission side (hereinafter referred to as communication device A) stops the transmission of the RTP stream after the RTP session ends, but if this communication device A fails, the RTP session However, the communication device A continues to transmit the RTP stream to the communication device on the other side (hereinafter referred to as communication device B). Thereafter, when communication device B starts communication with another communication device (hereinafter referred to as communication device C), communication device B simultaneously receives RTP streams from both communication device A and communication device C. As a result, problems such as a decrease in communication performance of the communication device B occur. The communication device A in which the failure has occurred cannot detect the end of the session with the communication device B by receiving the RTP or RTCP packet, and thus continues to transmit the RTP stream to the communication device B.

  The present invention has been made in view of the problems as described above, and an RTP data communication apparatus capable of detecting a failure occurring in a communication device on the other side at an early stage after the end of the RTP session and solving the problem of the failure. The purpose is to provide.

  An RTP data communication apparatus according to the present invention is an RTP data communication apparatus that transmits / receives RTP data to / from at least one communication apparatus via a communication network, and establishes and disconnects a call connection with the communication apparatus. When it is determined that the RTP data has been received after elapse of a predetermined set time from the call connection unit and the communication device that is the target of the call connection disconnection process by the call connection unit And an abnormality detection notification unit that supplies an abnormality detection notification to the communication network.

  According to the RTP data communication device of the present invention, it is possible to quickly detect a failure that has occurred in the communication device on the other side after the RTP session ends and to solve the problem of the failure.

It is a block diagram showing the RTP data communication apparatus of a present Example with a communication apparatus, a call control apparatus, a maintenance monitoring apparatus, and a communication network. It is an example of the communication status table which the communication status memory | storage part of FIG. 1 memorize | stores. It is an example of the elapsed time measurement table which the elapsed time measurement part of FIG. 1 hold | maintains. It is a sequence diagram showing operation | movement of each apparatus in abnormal RTP data reception detection processing. It is a flowchart showing an abnormal RTP data reception detection notification processing routine. It is a time chart showing the determination timing in a RTP data packet and the abnormal RTP reception determination part of FIG.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an RTP data communication apparatus A10 (hereinafter simply referred to as communication apparatus A10) according to the present embodiment, together with a communication apparatus (partner communication apparatus) 20, a call control apparatus 30, a maintenance monitoring apparatus 40, and communication networks 51 and 52. FIG. The communication device A10 transmits and receives multimedia data such as audio data and moving image data as RTP stream data to and from the communication device B20 via communication networks 51 and 52 such as a VoIP (Voice over Internet Protocol) network. For example, an information communication device such as a gateway device or a personal computer. The communication device B20 is a counterpart communication device of the communication device A10 and has the same configuration as the communication device A10. Here, for convenience of explanation, only the communication device B20 is shown as the counterpart communication device, but two or more counterpart communication devices may be connected to the communication networks 51 and 52.

  The call control device 30 is a device such as an SIP server that controls call connection between the communication device A10 and the communication device B20 according to a communication protocol such as SIP (Session Initiation Protocol). The maintenance monitoring device 40 is a device such as a server provided in a management company or the like for performing maintenance and management of devices such as the communication device A10 connected to the communication network 51. The communication networks 51 and 52 are communication networks such as VoIP, for example, the communication network 51 is a communication network mainly for communication regarding call connection, and the communication network 52 is mainly for communication of RTP data. It is a communication network. The communication network 51 and the communication network 52 may be configured by a single communication network.

  The communication device A10 includes a communication interface A11, a communication interface B12, a call connection unit 13, a communication state storage unit 14, an elapsed time measurement unit 15, an RTP reception monitoring unit 16, an abnormal RTP reception determination unit 17, An abnormality notification unit 18 and an RTP data processing unit 19 are included. Hereinafter, a functional block including the communication state storage unit 14, the elapsed time measurement unit 15, the RTP reception monitoring unit 16, the abnormal RTP reception determination unit 17, and the abnormality notification unit 18 is referred to as an abnormality detection notification unit.

  The communication interface A <b> 11 is a communication interface that mainly transmits and receives call connection data via the communication network 51. The communication interface B12 is a communication interface that mainly transmits and receives multimedia data such as moving image data as RTP data via the communication network 52, for example.

  The call connection unit 13 establishes or disconnects a call connection with the communication device B20 in response to an instruction to establish or disconnect a call connection from the call control device 30. The call connection is established and disconnected by exchanging messages such as INVITE and BYE according to the SIP protocol, for example. In addition, the call connection unit 13 causes the communication state storage unit 14 to store the call connection establishment and disconnection state for each communication device.

  The communication state storage unit 14 is a storage medium such as a hard disk that stores the state of establishment and disconnection of call connection for each communication device. FIG. 2 is an example of a communication state table stored in the communication state storage unit 14. The “other party communication device” is an identifier such as an IP address for identifying the other party communication device such as the communication device B20. Here, for convenience of explanation, identifiers are B, C, D. “Call connection status” indicates for each counterpart communication device whether the call connection status between the communication device A10 and the counterpart communication device is “established” or “disconnected”.

  The elapsed time measuring unit 15 measures the elapsed time from the disconnection of the call connection with the counterpart communication device for each counterpart communication device. FIG. 3 is an example of an elapsed time measurement table held by the elapsed time measurement unit 15. The “other party communication device” is an identifier of the other party communication device. Here, for convenience of explanation, identifiers are B, C, D. The “elapsed time” indicates the elapsed time since the call connection is disconnected for each counterpart communication device. The elapsed time for the partner communication device that has established the call connection is shown as "-".

  The RTP reception monitoring unit 16 monitors the reception state of RTP data by the communication interface B12 for each counterpart communication device such as the communication device B20. The RTP reception monitoring unit 16 determines the partner communication device that is the transmission source of the RTP data, based on the transmission source address included in the header of the packet that includes the RTP data. The RTP reception monitoring unit 16 notifies the abnormal RTP reception determination unit 17 of the reception state of the RTP data for each counterpart communication device.

  The abnormal RTP reception determination unit 17 is configured such that the RTP data received by the communication interface B12 is RTP data from the communication device on the other side that is the target of the call disconnection process by the call connection unit 13, and a predetermined amount from the time of call disconnection. If the set time has elapsed, it is determined that the RTP data is abnormal RTP data.

  Specifically, the abnormal RTP reception determination unit 17 receives a notification of the reception state of the RTP data for each partner communication device from the RTP reception monitoring unit 16, and the partner whose call connection with the communication device A10 is in a disconnected state. Whether or not RTP data has been received from the side communication device is grasped by referring to the communication state table (FIG. 2) of the communication state storage unit 14.

  Next, when the abnormal RTP reception determination unit 17 determines that RTP data has been received from the partner communication device in the call disconnection state, the abnormal RTP reception determination unit 17 refers to the elapsed time measurement table (FIG. 3) of the elapsed time measurement unit 15. Then, the elapsed time corresponding to the counterpart communication device is acquired. Subsequently, when it is determined that the elapsed time is longer than the predetermined set time, the abnormal RTP reception determination unit 17 determines that the RTP data received by the communication interface B12 is abnormal RTP data. The setting time is not particularly limited, and may be set as appropriate within a range of, for example, several milliseconds to several minutes according to the system configuration.

  The abnormality notification unit 18 supplies the communication network 51 that the abnormality RTP reception determination unit 17 has determined that the data is abnormal RTP data as an abnormality detection notification, and this is supplied to the call control device 30 and / or the maintenance monitoring device 40. Send to. At this time, the abnormality notification unit 18 transmits an identifier such as an IP address of the counterpart communication device corresponding to the abnormal RTP data included in the abnormality detection notification. The abnormality detection notification is transmitted via the communication interface A10 by packet transmission.

  The RTP data processing unit 19 performs predetermined processing on the RTP data received by the communication interface B12. When the communication device A10 is an information communication terminal such as a personal computer and the RTP data is moving image data, the RTP data processing unit 19 performs reproduction output of moving images based on the moving image data. When the communication device A10 is a relay device such as a gateway, the RTP data is relayed to the destination device. The RTP data processing unit 19 also has a function of generating RTP data and transmitting it from the communication interface B12.

  The communication device A10 can be configured by a hardware resource such as an arithmetic processing device such as a microprocessor or a storage medium such as a hard disk.

  FIG. 4 is a sequence diagram illustrating operations of the communication device A10, the communication device B20, and the call control device 30 in the abnormal RTP data reception detection process. Hereinafter, the abnormal RTP data reception detection process will be described with reference to FIG.

  First, the call control device 30 issues a call connection instruction to each of the communication devices A10 and 20 in response to the call connection request (step S101) (steps S102 and S103). The call connection instruction includes information necessary for starting the RTP session such as the IP address of the partner communication device. The call connection unit 13 of the communication device A10 performs call connection processing in response to the instruction (step S104). The communication device B20 also performs call connection processing according to the instruction (step S105). As a result, a call connection is established between the communication device A10 and the communication device B20, and the communication devices A10 and 20 can transmit and receive RTP data such as voice data to each other (step S106). These call connection processes are performed by exchanging messages such as INVITE and 200OK according to the SIP communication protocol.

  The call connection unit 13 of the communication device A10 establishes a call connection with the communication device B20 (step S110), and then enters the communication state table (FIG. 2) of the communication state storage unit 14 with the communication device B20. The fact that the call connection state is an established state is stored.

  Next, the call control device 30 issues a call disconnection instruction to each of the communication devices A10 and 20 in response to the call disconnection request (step S107) (steps S108 and S109). The call connection unit 13 of the communication device A10 performs call disconnection processing according to the instruction (step S110). The communication device B20 also performs a call disconnection process in response to the instruction (step S111). Here, although the communication device A10 was able to normally disconnect the call, the communication device B20 could not disconnect the call due to its own failure or the like (step S112). The communication device A10 stops transmission of RTP data after the call is disconnected, but the communication device B20 continues to transmit RTP data even after the call is disconnected (step S113).

  Next, the communication device A10 performs an abnormal RTP reception detection process (step S114) and an abnormality detection notification process (step S115). Hereinafter, a process composed of both processes is referred to as an abnormal RTP data reception detection notification process. FIG. 5 is a flowchart showing an abnormal RTP data reception detection notification processing routine. Hereinafter, the processing in the communication apparatus A10 will be described with reference to FIG.

  First, the call connection unit 13 disconnects the call connection with the communication device B20 (step S110 in FIG. 4), and then enters the communication state table (FIG. 2) in the communication state storage unit 14 with the communication device B20. The fact that the call connection state is disconnected is stored (step S201). The elapsed time measuring unit 15 starts measuring the elapsed time from when the call connection unit 13 disconnects the call with the communication device B20 (step S202). The elapsed time measurement unit 15 records the elapsed time for the communication device B20 in the elapsed time measurement table (FIG. 3) held by itself.

  The communication interface B12 continues to receive the RTP packet transmitted from the communication device B20 even after the call is disconnected. The RTP reception monitoring unit 16 monitors the reception of the RTP packet by the communication interface B12, and based on the transmission source IP address included in the header of the RTP packet received by the communication interface B12, the partner side of the transmission source of the RTP packet Determine the communication device. Then, the RTP reception monitoring unit 16 notifies the abnormal RTP reception determination unit 17 of the reception state of the RTP data for each counterpart communication device (step S203).

  The abnormal RTP reception determination unit 17 receives the notification from the RTP reception monitoring unit 16 and determines whether or not the RTP data is received from the counterpart communication device in which the call connection with the communication device A10 is disconnected. The determination is made with reference to the communication state table (FIG. 2) in the storage unit 14 (step S204). If it is in a call connection state with the communication apparatus on the other side of the RTP data transmission source, the process returns to step S203. However, since the call connection with the communication apparatus B20 is disconnected here, the process proceeds to the next step S205. Transition.

  Next, the abnormal RTP reception determination unit 17 refers to the elapsed time measurement table (FIG. 3) held by the elapsed time measurement unit 15 and determines whether or not the elapsed time for the communication device B20 exceeds a predetermined set time. Is determined (step S205). The set time is not particularly limited, and may be set as appropriate, for example, at an appropriate time such as 10 seconds. If the elapsed time is less than or equal to the set time, the process returns to step S203. When the elapsed time is longer than the set time, the abnormal RTP reception determination unit 17 determines that the RTP data received by the communication interface B12 is abnormal RTP data.

  FIG. 6 is a time chart showing RTP data packet and abnormal RTP reception determination timing from the communication device B20. As described above, the communication interface B12 continues to receive RTP packets from the communication device B20 even after the time t0 when the call connection unit 13 disconnects the call connection with the communication device B20. When the abnormal RTP reception determination unit 17 determines that the elapsed time (t0 to t1) from the disconnection time t0 is longer than a predetermined set time when the communication interface B12 receives the RTP packet, the abnormal RTP packet is abnormal. It is determined that it is reception (time t2).

  Refer to FIG. 5 again. When the abnormality RTP data reception determination is performed by the abnormality RTP reception determination unit 17, the abnormality notification unit 18 notifies the communication device B20 that an abnormality has been detected (abnormality detection notification) via the communication interface A11. 51 is transmitted to the call control device 30 and / or the maintenance monitoring device 40 (step S206). For example, the abnormality notification unit 18 uses the communication included in the call connection instruction (step S102 in FIG. 4) from the call control device 30 used when the call connection unit 13 establishes a call connection with the communication device B20. Information about the device B20 is included in the abnormality detection notification and transmitted as information indicating the communication device B20.

  Refer to FIG. 4 again. The abnormality notification unit 18 transmits an abnormality detection notification to the call control device 30 (step S116). The abnormality notification unit 18 may transmit the same notification to the maintenance monitoring device 40 as a maintenance person / maintenance device notification (step S117). Upon receiving the abnormality detection notification, the call control device 30 performs failure handling processing for the communication device B20 (step S118). The failure handling process is, for example, a process of transmitting a signal for executing a reset process or a reboot process of the communication apparatus B20 to the communication apparatus B20. Further, for example, a signal such as an instruction for restoring the normal state of the communication device such as self-sustained diagnosis may be transmitted to the communication device B20 (step S119).

  As described above, when the communication apparatus A10 of this embodiment determines that RTP data has been received from the communication apparatus B20 that is the target of the call connection disconnection process after a predetermined set time has elapsed since the disconnection process. In addition, an abnormality detection notification is transmitted to the call control device 30 and the maintenance monitoring device 40 via the communication network. With this configuration, the partner communication device does not have a special configuration, so that a failure occurring in the partner communication device after the end of the RTP session can be detected at an early stage to solve the problem of the failure.

10 Communication device A (RTP data communication device)
11 Communication interface A
12 Communication interface B
13 Call connection unit 14 Communication state storage unit 15 Elapsed time measurement unit 16 RTP reception monitoring unit 17 Abnormal RTP reception determination unit 18 Abnormal notification unit (notification unit)
19 RTP data processing unit 20 Communication device B (partner communication device)
30 Call control device 40 Maintenance monitoring device 51, 52 Communication network

Claims (4)

An RTP data communication device that transmits / receives RTP data to / from at least one communication device via a communication network,
A call connection unit for establishing and disconnecting a call connection with the communication device;
When it is determined that the RTP data has been received after a predetermined set time has elapsed from the communication device targeted for the call connection disconnection process by the call connection unit, to the communication network An RTP data communication apparatus comprising: an abnormality detection notification unit that supplies an abnormality detection notification. The abnormality detection notification unit
A communication state storage unit for storing a state of call connection for each communication device;
An elapsed time measuring unit that measures an elapsed time since the disconnection of the call connection for each communication device;
The RTP data is abnormal RTP data when it is determined that the RTP data is from a communication device subject to the call connection disconnection process and the elapsed time for the communication device is longer than the set time. An abnormal RTP reception determination unit that determines that there is,
The RTP data communication apparatus according to claim 1, further comprising: a notification unit that supplies, as the abnormality detection notification, that the abnormal RTP reception determination unit determines that the data is abnormal RTP data.   3. The RTP data communication apparatus according to claim 2, wherein the RTP reception monitoring unit determines a communication apparatus that has transmitted the RTP data based on a transmission source address included in a header of a packet including the RTP data. .   The RTP data communication apparatus according to any one of claims 1 to 3, wherein the communication unit establishes and disconnects the call connection in accordance with a SIP standard.

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