JP2011176620A - Communication test apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication test apparatus capable of performing a communication test according to a codec of a terminal even if various codecs are not loaded. <P>SOLUTION: The communication test apparatus has: a first receiving part which receives connection request information including codec information showing the codec which can be utilized by the terminal transmitted from the terminal; a codec information extraction part which extracts the codec information from the received connection request information; a first transmitting part which transmits the codec information extracted by the codec information extraction part to the terminal which transmits the connection request information; a second receiving part which receives a packet transmitted from the terminal according to the transmitted codec information; a response information generation part which rewrites a header of the header and a payload included in the received packet, and imparts the rewritten header to the payload to generate response information; and a second transmitting part which transmits the response information generated by the response information generation part to the terminal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication test apparatus for testing a communication state of a terminal device.

When communication is confirmed as to whether or not a terminal device connected to the public line network is able to communicate correctly, a communication test is performed by connecting the terminal device and the communication test device via the public line network. ing. Such a communication test may be performed for a plurality of terminal devices. In this case, there is one in which a communication test is performed on a plurality of terminal devices in accordance with a scenario in which a test procedure is defined (see, for example, Patent Document 1). Some terminal devices connected to the IP network perform a communication test (see, for example, Patent Document 2).
On the other hand, in recent years, a network corresponding to various codecs is constructed, and a terminal device is connected to the network to provide services using various codecs.

JP 2006-352625 A JP 2009-194709 A

  However, when considering the communication test in the network corresponding to the various codecs described above, in order to check the communication of each terminal device, the communication test device side needs to support various codecs. That is, since the communication test cannot be performed unless the communication test apparatus has the same codec as that of the terminal apparatus side, the same codec as the codec of the terminal apparatus side is provided in the communication test apparatus, and the same codec as the terminal apparatus is provided. It is necessary to conduct a communication test according to

Thus, when trying to support various terminals and various codecs, it is necessary to newly provide communication test apparatuses corresponding to various codecs, or to mount various codecs in the communication test apparatus. In this situation, if a new codec is further provided, it is necessary to correspond to the added codec on the communication test apparatus side every time the new codec is added.
Here, although the above-described Patent Documents 1 and 2 are subjected to a communication test, they cannot cope with various codecs and thus do not solve the above-described problems.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a communication test apparatus capable of performing a communication test according to the codec of a terminal device without mounting various codecs. There is.

  In order to solve the above-described problem, the present invention is a communication test apparatus to which a plurality of terminal devices are connected, and includes a connection including codec information indicating a codec that can be used by the terminal device transmitted from the terminal device A first receiving unit for receiving request information; a codec information extracting unit for extracting codec information from connection request information received by the first receiving unit; and the connection request for the codec information extracted by the codec information extracting unit. A first transmitter that transmits information to the terminal device, a second receiver that receives a packet transmitted from the terminal device in accordance with codec information transmitted by the first transmitter, and the second receiver. Information that generates response information by rewriting the header and adding it to the payload among the header and payload included in the packet received A generating unit, and having a second transmission unit that transmits the response information generated in the terminal device by the response information generator.

  Further, the present invention is characterized in that, in the above communication test apparatus, the codec information extraction unit extracts any one codec type when the codec information includes a plurality of codec types. To do.

  Further, the present invention is the communication test apparatus described above, wherein the second transmission unit transmits the response information to the terminal device after a predetermined time has elapsed since the second reception unit received the packet. Features.

  Further, according to the present invention, in the communication test apparatus described above, the source included in the header of the connection request information received by the first receiver is set as the destination, and the destination included in the header of the connection request information is set as the source. And a call-back unit for adding the header to the codec information of the connection request information received by the first receiving unit, and transmitting the codec information to which the header is added by the call-back unit to the terminal device And a third transmitter.

  As described above, according to the present invention, connection request information including codec information transmitted from a terminal apparatus is received, codec information is extracted from the connection request information, and transmitted to the terminal apparatus that transmitted the connection request information. Then, the packet transmitted from the terminal device is received according to the codec information, and the header and payload included in the received packet are rewritten and added to the payload to be transmitted to the terminal device. . Thereby, even if it does not have the same codec as the codec which a terminal device has, a communication test can be performed.

It is the schematic which shows the structure of the communication test system 1 containing the communication test apparatus 100 by one Embodiment of this invention. 1 is a schematic block diagram illustrating a configuration of a communication test apparatus 100. FIG. It is a sequence diagram explaining operation | movement of the communication test apparatus 100 in the case of implementing a transmission test function. It is a figure explaining operation | movement of the communication test apparatus 100 in the case of implementing an incoming test function.

Hereinafter, a communication test apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a configuration of a communication test system 1 including a communication test apparatus 100 according to an embodiment of the present invention. In the communication test system 1, the communication test apparatus 100 and the terminal devices 200, 210, 220, 230, and 240 are connected via a network 300, and communicate according to a SIP (Session Initiation Protocol) protocol.
The terminal device 200 is a G. The terminal device 210 is equipped with a G.711 μlaw codec. 711.1 and G.A. The terminal device 220 is equipped with a G.711 μlaw codec. 711 μlaw and MPEG-4 Visual codec are installed. 711.1 and MPEG-4 Visual codecs are installed, and the terminal device 240 is equipped with a new codec (for example, an unknown codec) other than these codecs. The communication test apparatus 100 has a function of performing a communication test on each of these terminal apparatuses 200 to 240.

  FIG. 2 is a schematic block diagram showing the configuration of the communication test apparatus 100. The communication test apparatus 100 includes a reception unit 110, a transmission data generation unit 120, and a transmission unit 130.

The receiving unit 110 includes a first receiving unit 111 and a second receiving unit 112, and receives various types of information transmitted from the terminal devices (200 to 240).
The first reception unit 111 receives connection request information that is connection request information transmitted from each terminal device (200 to 240) and includes codec information indicating a codec that can be used by the terminal device. This connection request information includes, for example, information describing SDP (Session Description Protocol) including the type of codec. The type of codec is information indicating the codec installed in the transmission source terminal device, and may include only one type or may include a plurality of types.
The second reception unit 112 receives a packet corresponding to the codec information transmitted by the first transmission unit 131 and transmitted from the terminal device.

The transmission data generation unit 120 includes a codec information extraction unit 121, a response information generation unit 122, and a call back unit 123, and generates information for performing a transmission test and an incoming test, respectively.
<Outgoing test>
The codec information extraction unit 121 extracts codec information from the connection request information received by the first reception unit 111. When the codec information includes a plurality of codec types, the codec information extraction unit 121 extracts one of the codec types. The response information generation unit 122 rewrites the header of the packet out of the header and the payload constituting the packet received by the second reception unit 112, adds the rewritten header to the payload, and generates response information.

<Incoming test>
The call back unit 123 generates a header in which the transmission source included in the header of the connection request information received by the first reception unit 111 is a destination, and the destination is included in the header of the connection request information. The header is added to the codec information of the connection request information received by the first receiving unit 111.

The transmission unit 130 includes a first transmission unit 131, a second transmission unit 132, and a third transmission unit 133, and transmits various types of information from the communication test apparatus 100 to the terminal devices (200 to 240).
The first transmission unit 131 transmits the codec information extracted by the codec information extraction unit 121 to the terminal device that transmitted the connection request information.
The second transmission unit 132 transmits the response information generated by the response information generation unit 122 to the terminal device. The second transmission unit transmits the response information to the terminal device after a predetermined time has elapsed since the second reception unit received the packet.
The third transmission unit 133 transmits the codec information provided with the header by the call back unit 123 to the terminal device.

Next, the operation of the communication test apparatus 100 having the above-described configuration will be described.
FIG. 3 is a sequence diagram for explaining the operation of the communication test apparatus 100 when the transmission test function is performed. Here, a case where a communication test is performed between the terminal device 210 and the communication test apparatus 100 will be described as an example.
In performing the communication test, the terminal device 210 transmits INTIVE in which the SDP including the type of codec installed in the terminal device 210 is described as connection request information to the communication test device 100 (step S100). When the transmission data generation unit 120 of the communication test apparatus 100 receives the INTIVE signal via the reception unit 110, the transmission unit 130 transmits 100 Trying to the terminal device 210 (step S110) and 180 ringing (step S120).

  Next, the codec information extraction unit 121 of the transmission data generation unit 120 extracts codec information based on the information included in the received INVITE. Here, FIG. 3A shows an example of contents in which the INVITE SDP is described. This SDP includes G. Codec A, G. A codec B representing a codec of 711 μlaw is described in order. The codec information extraction unit 121 of the transmission data generation unit 120 deletes the codec B described at the end of the codec A (G.711.1) and the codec B (G.711 μlaw), Codec A described in the line is extracted. An example of the extracted information is shown in FIG.

When the codec information is extracted, the first transmission unit 131 of the transmission unit 130 transmits 200 OK including the extracted codec to the terminal device 210 (step S130).
When receiving the 200 OK, the terminal device 210 refers to the codec information from the received 200 OK. Here, codec A is referred to. Then, the terminal apparatus 210 generates test data corresponding to the codec A, includes this in the payload, adds an RTP (Real-Time transport Protocol) header to the payload, and transmits the RTP packet to the communication test apparatus 100. (Step S140). Here, codec A, G.I. Test data corresponding to the 711.1 codec is included.

In the communication test apparatus 100, the second reception unit 112 of the reception unit 110 receives the RTP packet transmitted from the terminal device 210.
The response information generation unit 122 of the transmission data generation unit 120 rewrites a part of the RTP header out of the RTP header and the payload constituting the RTP packet received by the second reception unit 112. Here, an example of rewriting the RTP header is shown in FIG. Here, the response information generation unit 122 performs rewrite processing on SSRC (Synchronization Source Identifier) so as to be a parameter corresponding to information to be transmitted next, and does not perform rewrite processing on Time Stamp and Sequence Number. A new RTP header is generated. When a new RTP header is generated, the response information generation unit 122 copies the payload of the RTP packet received by the second reception unit, adds a new RTP header to the copied payload, and creates a new RTP header. An RTP packet is generated.
The second transmission unit 132 of the transmission unit 130 transmits the new RTP packet generated by the response information generation unit 122 to the terminal device 210 after a predetermined time has elapsed since the second reception unit 112 received the RTP packet. As RTP (step S150).

  The terminal device 210 receives the RTP transmitted from the communication test device 100 and performs output according to the test data included in the RTP packet. When this output is performed, the terminal apparatus 210 transmits BYE to the communication test apparatus 100 (step S160). The communication test apparatus 100 receives the BYE transmitted from the terminal apparatus 210 and transmits 200 OK to the terminal apparatus 210 (step S170).

FIG. 4 is a diagram for explaining the operation of the communication test apparatus 100 when the incoming test function is implemented. Here, a case where a communication test is performed between the terminal device 210 and the communication test apparatus 100 will be described as an example. In this embodiment, an incoming test is performed using information when a transmission test is performed between the terminal apparatus 210 and the communication test apparatus 100.
Here, first, a transmission test is performed between the terminal apparatus 210 and the communication test apparatus 100. That is, when INVITTE is transmitted from the terminal device 210 to the communication test apparatus 100 (step S200), 100Trying is transmitted from the communication test apparatus 100 (step S210), 180 ringing is transmitted (step S220), and 200 OK is transmitted. (Step S230). When RTP is transmitted from the terminal device 210 (step S240), RTP for response is transmitted from the communication test device 100. In response to this, the terminal apparatus 210 transmits BYE to the communication test apparatus 100 (step S250), and the communication test apparatus 100 transmits 200 OK to the terminal apparatus 210 (step S260).

  When the above transmission test is performed, the call back unit 123 of the transmission data generation unit 120 stores a copy of INVITE transmitted from the terminal device 210 in a memory area provided in itself. An example of this stored information is shown in FIG. This INVITE includes a header (reference symbol b in FIG. 4) and codec information (reference symbol c in FIG. 4). The call back unit 123 rewrites the header included in the INVITE packet in which the transmission source is the terminal device 210 and the destination is the communication test device 100 to the communication test device 100 as the transmission source and the terminal device 210 as the destination. A new header (reference numeral d in FIG. 4) is generated. Then, the generated new header is added to the codec information in the stored copy of INVITE. Codec information to which this new header is added is shown in FIG.

  Next, when the incoming test is started, the communication test apparatus 100 transmits INVITE to the terminal device 210 that is the target of the incoming test (step S300). Here, the 3rd transmission part 133 of the transmission part 130 includes the codec information (FIG. 4 code | symbol) provided with the new header in INVITE (code | symbol f FIG. 4), and transmits. Upon receiving this INVITE, the terminal device 210 transmits 100 Trying to the communication test apparatus 100 (step S310), 180 ringing (step S320), 200 OK (step S330), and RTP (step). S340). In response to this RTP, the communication test apparatus 100 transmits an RTP for response to the terminal apparatus 210. When BYE is transmitted from the terminal apparatus 210 to the communication test apparatus 100 (step S350), the communication test apparatus 100 transmits 200 OK to the terminal apparatus 210 (step S360).

As described above, according to the above-described embodiment, in response to an incoming call from an arbitrary terminal device, a codec is selected, and the received test data is sent back as it is. You can test.
In the existing technology, the same function as that of the terminal device (telephone terminal) is implemented, and a telegram and test data at the time of call connection are newly generated and transmitted. According to the above-described embodiment, the received information is transmitted. For the test data, only the header of the received data is rewritten and transmitted as it is. As a result, the existing communication test apparatus can test only a general telephone (G.711 μlaw). However, according to the above-described embodiment, another codec (high-quality telephone (G.711.1) or video call) can be used. The test can be performed on various terminals using (MPEG-4 Visual)).

  In addition, with respect to connection request information in which SDP including various codecs is described, a codec is selected, and information for responding by copying SDP is generated. Here, the SDP including the codec included in the connection request information is copied and response information is generated and transmitted to the terminal device. In response to the RTP packet transmitted from the terminal device, the received RTP packet Since the header is changed as it is and the payload is changed, it is transmitted to the terminal device. Therefore, even if the SDP transmitted from the terminal device includes multiple codecs or unknown codecs, communication is possible. A test can be performed.

  In addition, the SDP is extracted from the INVITE received in the transmission confirmation test, the information such as the source and destination of the header is rewritten, and the call is returned by the received codec. It is now possible to send a call to a terminal device and perform an incoming call test. In this way, the communication test apparatus wraps the test data (RTP packets such as audio / video) to the terminal device as it is, so that it is not necessary to have a codec corresponding to the terminal device. An outgoing test can be performed. In this case, even if a new codec is provided, it is sufficient to use test data transmitted from the terminal device to be tested, so a communication test device corresponding to the codec is newly provided. There is no need.

  Further, according to the above-described embodiment, the communication test apparatus 100 responds to the terminal apparatus after a predetermined time has elapsed since the second receiving unit 112 received the RTP packet. When the response packet is transmitted immediately after receiving the connection request information, the sound of the speaker on the terminal device side goes into the microphone and howling occurs. However, the above configuration can prevent howling.

  Further, according to the above-described embodiment, the transmission source included in the header of the connection request information received by the receiving unit is set as the destination, and the header including the destination included in the header of the connection request information is generated. Since the header is added to the codec information and the codec information to which the header is added is transmitted when the incoming test is started, the incoming test can also be performed.

  In the above-described embodiment, the case where two codecs are included in the codec information of the connection request information transmitted from the terminal device has been described. However, the case where three or more codecs are included is also supported. It is. For example, if three codecs are included, one of them may be extracted. Since any one type of codec is extracted and a header is added to the extracted codec information and transmitted to the terminal device, a communication test is also performed for a terminal device corresponding to a plurality of types of codecs. be able to.

  Although the case where the second transmission unit 132 of the transmission unit 130 transmits the RTP packet after a certain time has elapsed has been described, this certain time may be a predetermined time. In addition, as to whether or not a certain time has elapsed, a timer is provided in the second transmission unit 132, and when the RTP packet is received from the transmission data generation unit 120, or the second reception unit 112 has received RTP. Counting may be started from the point in time, and when the count value reaches a predetermined value, it may be detected that a certain time has elapsed and RTP packets are transmitted.

In addition, it is assumed that various codec terminal devices such as video terminals and telephones that output audio and video are installed at the user's home, and a communication test is necessary to confirm the normality of the terminal devices. According to the invention, various codec communication tests can be performed.
For example, when video terminals are connected between users and video and audio are transmitted / received to / from each other, when either video is not output normally, a failure has occurred in the terminal device on the transmission side, so Even if it is not possible to determine whether the video is not normally output from the terminal device or whether the video transmitted from the transmission side cannot be normally output because a failure has occurred in the terminal device on the reception side, the communication test apparatus 100 By carrying out the communication test using, it is possible to grasp which terminal device has an abnormality.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Communication test system 100 Communication test apparatus 110 Reception part 111 1st reception part 112 2nd reception part 120 Transmission data generation part 121 Codec information extraction part 122 Response information generation part 123 Call back part 130 Transmission part 131 1st transmission part 132 1st 2 transmission unit 133 3rd transmission unit 200, 210, 220, 230, 240 terminal device 300 network

Claims (4)

A communication test apparatus to which a plurality of terminal devices are connected,
A first receiving unit that receives connection request information including codec information indicating a codec that can be used by the terminal device transmitted from the terminal device;
A codec information extraction unit that extracts codec information from the connection request information received by the first reception unit;
A first transmission unit that transmits the codec information extracted by the codec information extraction unit to the terminal device that transmitted the connection request information;
A second receiving unit that receives a packet transmitted from the terminal device according to codec information transmitted by the first transmitting unit;
Of the header and payload included in the packet received by the second receiving unit, a response information generating unit that rewrites the header and gives it to the payload to generate response information;
A second transmission unit that transmits the response information generated by the response information generation unit to the terminal device;
A communication test apparatus characterized by comprising:   The communication test apparatus according to claim 1, wherein the codec information extraction unit extracts any one of the codec types when the codec information includes a plurality of codec types.   The said 2nd transmission part transmits the said response information to the said terminal device, after fixed time passes since a said 2nd reception part received a packet, The said terminal device is characterized by the above-mentioned. Communication test equipment. The sender included in the header of the connection request information received by the first receiver is set as the destination, and a header is generated with the destination included in the header of the connection request information as the sender, and the header is received in the first reception. A call back unit to be added to the codec information of the connection request information received by the unit;
A third transmission unit that transmits the codec information to which the header is added by the call back unit to the terminal device;
The communication test apparatus according to any one of claims 1 to 3, wherein the communication test apparatus is provided.

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