JP4932562B2 - Communication apparatus, method, and program - Google Patents

Description

  The present invention relates to a communication apparatus, and more particularly to a communication apparatus that performs communication using a call control protocol.

  Conventionally, in the case of communication such as an IP telephone in which a data session is established between a caller and a callee terminal, a call control protocol such as SIP is used. Here, with reference to FIG. 5 to FIG. 6, the conventional SIP signal processing at the receiving terminal will be described. First, as shown in FIG. 5, the receiving terminal 100 in the conventional example is configured to transmit and receive a SIP signal through a single port (SIP receiving port 111). The receiving terminal 100 includes a SIP receiving unit 112 that receives a SIP signal from the SIP receiving port 111, and processes a signal received by the SIP receiving unit 112 or transmits a SIP signal to be transmitted. An SIP processing unit 113 for processing is provided.

A specific example of actual SIP signal processing will be described with reference to the sequence diagram of FIG. Here, it is assumed that the SIP signal port number of the receiving terminal 100 is 5060. First, the SIP server 300 transmits an “INVITE” request to the receiving terminal 100 in response to a call from a transmitting terminal (not shown) (step S101). At this time, the SIP server 300 transmits to the port number 5060 of the receiving terminal. Then, the receiving terminal 100 receives the “INVITE” request and receives “100
A “Trying” response is transmitted (step S102).
An “OK” response is transmitted (step S103). At this time, the port number notified from the receiving terminal 100 remains the port number 5060.

Subsequently, the SIP server 300 receives the “200” from the receiving terminal 101.
The “OK” response is received and transferred to the calling terminal connected to the SIP server 300. Then, the caller terminal transmits an “ACK” request, which is received by the SIP server 300 and transferred to the callee terminal 100 (step S104). As a result, a session between the caller terminal and the callee terminal 100 is established, and the service can be started (step S105).

Thereafter, when a SIP signal is transmitted from the calling terminal to the receiving terminal 100 (step S106), this SIP signal is received by the above-described one port 5060 of the receiving terminal 100. For example, when a “BYE” request is transmitted from the calling terminal through the SIP server 300 to end the session (step S106), the receiving terminal 100 receives “200
By transmitting “OK (BYE)” (step S107), the session is terminated.

JP 2006-343943 A

  Thus, in the case of the above conventional example, the receiving terminal 100 receives the SIP signal at a single port. Therefore, when a large amount of SIP signals are received, the SIP signal is received at the receiving port when the SIP signal is received. Overflowed and discarded, a request or response delay for a newly connected call or a connected call occurred, and the SIP signal retransmission processing was repeated. In this case, in particular, there is an inconvenience that the communication with the receiving terminal that was being connected is disconnected, and thus stable communication cannot be performed with respect to the receiving terminal that is being connected. The problem arises. Further, in order to provide stable communication to the connected receiving terminal by the conventional SIP signal processing, it is necessary to increase the buffer size of the SIP receiving port.

  The system disclosed in Patent Document 1 discloses a technique of performing communication by changing the number of an access port used in a data session. However, in the technology described in Patent Document 1, only the port number of the data session is changed, and the transmission / reception port of the SIP signal is fixed. Therefore, when reception of the SIP signal is concentrated, As described above, there is a problem that communication cannot be stabilized yet, such as the SIP signal overflowing and being discarded.

  For this reason, in the present invention, the inconvenience of the above-described conventional example is improved, and in particular, by stabilizing the communication, it is possible to improve the convenience of the user and improve the quality of the communication service. The purpose is to provide.

Therefore, one aspect of the present invention is
A communication device that establishes a session with another communication device using a call control protocol and performs communication,
A first port that receives a call control signal transmitted at the time of a call from the calling communication device and another call control signal different from the call control signal transmitted at the time of a call from the calling communication device A second port, and
It is characterized by that.

Moreover, the other form of this invention is:
A communication device that establishes a session with another communication device using a call control protocol and performs communication,
A new call port for receiving a new call signal transmitted at the time of a new call from the calling communication device, and a connected call for receiving a call control signal transmitted from the calling communication device after receiving the new call signal And a port for
It is characterized by that.

  According to the above invention, in the communication device, a new call signal transmitted at the time of a new call from the calling communication device is received at the new call port, and a call control signal transmitted from the calling communication device thereafter is And received at the connected call port different from the new call port. Therefore, even when a large amount of call control signals are transmitted to the communication terminal, it can be received at different ports according to the call control signal, so that the port buffer size is not set large. In addition, discarding of call control signals, response delays, and the like can be suppressed, and communication can be stabilized. In particular, it is more effective when applied to a communication device that can use a plurality of lines through which a large number of call control signals are transmitted.

  And, it is provided with a connected call port notification means for notifying the port number of the connected call port to the calling communication device that has transmitted the new call signal received at the new call port. It is a feature. The connected call port notifying unit notifies the calling communication device of the port number of the connected call port before the next call control signal is transmitted from the calling communication device. It is characterized by that.

  Thus, by notifying the calling side communication device of the port number of the connected call port, a call control signal different from the new call signal is transmitted from the calling side communication device to the connected call port, Each signal can be received at each port more reliably. Therefore, it is possible to effectively suppress the discarding of the call control signal and further stabilize the communication. In particular, the new call signal and other call control signals are more reliably notified by notifying the port number after the new call signal is transmitted from the calling communication device and before the next call control signal is transmitted. Can be sent to each port and received on different ports.

  Further, the present invention is characterized by comprising a port setting means for setting an arbitrary port number different from the new call port as a connected call port. As a result, the port number of the currently connected call port can be set arbitrarily, so that an appropriate operating environment can be set according to the state of the communication device.

  In addition, when a call control signal different from the new call signal is received at the new call port, it has a function of processing the call control signal. As a result, even if a call control signal different from the new call signal is transmitted to the new call port even though the connected call port is set, the signal is processed and communicated. Since the process is performed, the communication can be stabilized.

  Also, the present invention is characterized by comprising buffer setting means for setting the capacity of each buffer for temporarily storing call control signals respectively received at the new call port and the connected call port. Thereby, by setting the buffer capacity of each port, it is possible to set an appropriate operating environment according to the state of the communication device.

Moreover, the other form of this invention is:
A communication method by a communication device that establishes a session with another communication device using a call control protocol and performs communication,
A new call signal receiving process for receiving a new call signal transmitted at the time of a new call from the calling communication device at the new call port, and a call control signal transmitted from the calling communication device thereafter connected A connected call signal receiving step for receiving at the port for use,
It is characterized by that.

  The connected call that notifies the port number of the connected call port to the calling communication device that has transmitted the received new call signal between the new call signal receiving step and the connected call signal receiving step. And a port notification step. In addition, it has a port setting step of setting an arbitrary port number different from the new call port as a connected call port at least before the connected call port notifying step.

Moreover, the other form of this invention is:
A communication method by a calling communication device and a called communication device that establishes a session with each other using a call control protocol and performs communication,
The calling communication device transmits a new call signal to the new call port set in the called communication device, and the called communication device receives the new call signal at the new call port. ,
Thereafter, the calling communication device transmits a call control signal different from the new call signal to the connected call port set in the called communication terminal, and the called communication device transmits the call control signal. Receive at the connected call port,
It is characterized by that.

And after the callee communication device receives a new call signal from the caller communication device, it notifies the caller communication device of the port number of the connected call port,
The calling communication device transmits a call control signal different from the new call signal to the connected call port based on the notified port number.
It is characterized by that.

Furthermore, the program which is the other form of this invention is:
A communication device that establishes a session with another communication device using a call control protocol and performs communication.
A new call signal receiving process for receiving a new call signal transmitted at the time of a new call from the calling communication device at the new call port, and a call control signal transmitted from the calling communication device thereafter connected A call signal reception process during connection to be received at the port,
It is characterized by making it execute.

  The communication device is notified of the port number of the connected call port to the calling communication device that has transmitted the received new call signal between the new call signal receiving step and the connected call signal receiving step. It is characterized in that the connected call port notification step is executed. In addition, the communication apparatus is characterized in that it executes a port setting step for setting an arbitrary port number different from the new call port as a connected call port before at least the connected call port notification step. Yes.

  Even the invention of the communication method and the program having the above-described configuration has the same operation as that of the above-described communication device, and thus the above-described object of the present invention can be achieved.

  Since the present invention is configured and functions as described above, according to this, even when a large amount of call control signals are transmitted to the communication terminal, reception is performed at different ports according to the call control signals. Therefore, without setting the buffer size of the port large, it is possible to suppress call control signal discard, response delay, etc., and improve the communication stability. Have

  The present invention is characterized by a communication method using a communication terminal that establishes a session with each other using a call control protocol and performs communication. For example, as a call control protocol, there is SIP (Session Initiation Protocol), and a SIP signal is used as a call control signal exchanged between communication terminals.

  In the present invention, the SIP signal is transmitted from the caller terminal (calling communication device) to the callee terminal (calling communication device) in order to establish a new connection according to the traffic characteristics. A new connection call signal (new call signal) and a connection call signal that is received once and then transmitted to the receiving terminal are considered. In this case, if the SIP signal transmitted from the SIP terminal to the receiving terminal is a new connection call signal, a new connection call port (new call port (first call A new call signal is transmitted to the port)). At this time, the port number of the currently connected call dedicated port is designated in response to the newly connected call signal. Here, the SIP signal transmitted from the originating terminal to the terminating terminal thereafter becomes the connected call signal. When the SIP signal transmitted to the receiving terminal between the SIP terminals is a connected call signal, the incoming call signal is transmitted to the connecting call dedicated port to the receiving terminal by receiving the incoming call signal. In the terminal on the side, reception is performed at the connected call dedicated port (connected call port (second port)).

  In this way, the SIP signal input port is divided into a newly connected call port and a connected call dedicated port, and is received separately in a newly connected call port and a connected call dedicated port. It is characterized in that, when a large number of calls come, the SIP signal discarding and retransmission processing due to the overflow of calls at the receiving port is reduced to achieve stable communication.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram illustrating a configuration of the entire system that performs communication using a call control protocol, and FIG. 2 is a block diagram illustrating a configuration of a receiving terminal. FIG. 3 is a sequence diagram showing the operation during communication in the system, and FIG. 4 is a flowchart showing the operation of the receiving terminal.

[Constitution]
In the present invention, a SIP server 3 is provided on the network N, a session is established through the SIP server 3 using a SIP signal, and a caller terminal 2 and a callee terminal 1 that perform communication are connected. . Here, the SIP server 3 has a general function of performing call control using a SIP signal. The caller terminal 2 and the callee terminal 1 are, for example, IP telephones that establish a session by SIP, or the callee terminal 1 provides a file server that provides various data to the caller terminal 2 Etc. Hereinafter, the receiving terminal 1 will be described in detail.

  As shown in FIG. 2, the receiving terminal 1 has a newly connected call port 11 having a predetermined port number, and a connected call dedicated port 12 having a port number different from that of the newly connected call port 11. Then, when receiving the SIP signal from the SIP server 3, the receiving terminal 1 receives the SIP signal via the newly connected call port 11 or the connected call dedicated port 12, and the SIP signal is transmitted as follows: This is performed via the newly connected call port 11. The newly connected call port 11 and the connected call dedicated port 12 have buffers for storing the newly connected call signal or the connected call signal at the respective ports. Note that the size of the buffer is variable. For example, when the user of the receiving terminal 1 performs a setting operation, it can be set to an arbitrary size by a function (buffer setting means) provided in advance in the terminal 2. Further, the buffer size of each of the ports 11 and 12 may be set according to the time zone by a prior setting (buffer setting means). For example, the buffer of the newly connected call port 11 may be set to automatically increase during a time zone when newly connected call signals are concentrated.

  In addition, the receiving terminal 1 includes a SIP processing unit 15 in the arithmetic unit, and in order of arrival at the receiving terminal 1 from the newly connected call SIP receiving unit 13 and the connected call dedicated SIP receiving unit 14. After receiving the signal and processing each according to the received call control signal, an appropriate SIP signal is transmitted to the SIP server 3, that is, the originating terminal 2.

  In addition, the SIP processing unit 15 receives a new connection call signal, and then notifies the caller side terminal 2 of the port number of the currently connected call dedicated port via the SIP server 3 (connected port notification means for connected call). Have At this time, the port number of the call-only port during connection may be set in advance, or may be selected from an available port before notifying the port number to the caller terminal 2 at least. Then, the setting of the connected call dedicated port may be set by automatically selecting from available ports by the function (port setting means) of the receiving terminal 2 such as the SIP processing unit 15, or It may be set by being selected according to a user's selection command. Note that the above-described timing of notifying the port number to the calling terminal 2 by the receiving terminal 1 will be described in detail later when the operation is described.

  As described above, basically, the newly connected call signal is received by the newly connected call port 11 and the currently connected call signal is received by the currently connected call dedicated port 12, and the processing corresponding to each SIP signal is performed by the SIP processing. This is performed in part 15. However, there is a case where the originating terminal 2 does not transmit the connected call signal to the connected call dedicated port 12. In such a case, the call signal being connected is received by the regulation connection call port 11, but even if a SIP signal is received by a port different from the set port, it has a function of processing the signal.

  Note that the functions of the receiving terminal 1 described above are realized by incorporating a predetermined program into the receiving terminal 1.

[Operation]
Next, the communication operation by the transmission side terminal 2 and the reception side terminal 1 via the SIP server 3 will be described. The following operations are executed by incorporating predetermined programs in the SIP server 3, the calling terminal 2, and the receiving terminal 1, respectively.

  First, the overall flow during communication will be described with reference to FIG. 2 described above. First, an “INVITE” request, which is a SIP signal for establishing a new connection with the receiving terminal 1, and an incoming call after that are sent from the calling terminal 2 (not shown) via the SIP server 3. Consideration is divided into two types, that is, another SIP signal that is a call that is being connected to the side terminal 1.

  Then, the receiving terminal 1 receives the “INVITE” request which is a newly connected call, and returns a response to the “INVITE” request. The port number of the call-only port 21 is set in the Contact header, and it is returned. The Contact header is set by the SIP processing unit 15 in FIG.

  Next, the SIP server 3 receives the response to the “INVITE” request including the Contact header set with the port number of the connected call-dedicated port 12 sent from the receiving terminal 1, and receives this response as “ The call is forwarded to the originating terminal 1 that has generated and transmitted the “INVITE” request or to another SIP server that forwards to the originating terminal 1. As a result, subsequent communications by the originating terminal 1 can be exchanged with the terminating terminal 1 through the port number of the connected call dedicated port 12. An arbitrary port number can be set in advance as the port number of the connected call dedicated port 12.

  Next, the flow of SIP signal processing will be described with reference to FIG. First, of the SIP signals, the newly connected call signal is received by the receiving terminal 1 through the newly connected call port 11 and the connected call signal is received through the connected call dedicated port 12. Then, the incoming terminal 1 receives the SIP signal from the new connection call port 11 at the new connection call SIP reception unit 13 and transmits it to the SIP processing unit 15. The SIP signal is received by the connected call dedicated SIP receiving unit 14 from the connected call dedicated port 12 and is transmitted to the SIP processing unit 15. The SIP processing unit 15 receives the SIP signals transmitted from the newly connected call SIP receiving unit 13 and the connected call dedicated SIP receiving unit 14 and processes the SIP signals in the order received. Next, the SIP processing unit 15 transmits the processed SIP signal to the SIP server 3 through the newly connected call port 11. The SIP processing unit 15 also assigns a Contact header in which the port number of the connected call dedicated port 12 is set to the SIP signal.

  Here, when the connected call-dedicated port 12 is set in advance, the originating terminal 2 may not permit the port change. For example, the SIP processing unit 15 of the receiving terminal 1 sets the port number of the connected call dedicated port 12 in the Contact header and transmits the SIP signal, but ignores it on the calling terminal 2 side and uses it for a new connection call. In some cases, it is transmitted using the port number of port 11. In consideration of such a case, the newly connected call SIP receiving unit 13 can also receive the connected call signal. Then, the SIP signal received at the newly connected call port at this time is processed by the SIP processing unit 15 as a connected call signal.

  Next, FIG. 3 is a sequence diagram of the SIP signal for changing the receiving port of the receiving terminal 1, and the communication operation will be described with reference to this. Here, it is assumed that the caller terminal 2 that is going to communicate with the callee terminal 1 permits the port change, the port number of the newly connected call port 11 of the callee terminal 1 is 5060, the call being connected The port number of the dedicated port 12 is 5062. If the port number of the connected call dedicated port 12 is arbitrarily set automatically or by user operation, as described later, at least before the port number is notified to the calling terminal 2 in step S3. Then, it is set before the SIP signal next to the newly connected call signal is transmitted from the originating terminal 2 (port setting step).

First, the SIP server 3 transmits an “INVITE” request to the receiving side terminal 1 in response to a call request from the calling side terminal 2 (step S1). At this time, since the SIP signal is a new connection call signal, it is transmitted to the new connection call port 11. Next, when the receiving terminal 1 receives the “INVITE” request (new call signal receiving step), “100
A “Trying” response is transmitted (step S2). Nothing is set in the “100 Trying” response. Thereafter, the receiving terminal 1 sets the port number of the currently connected call port 12 in the Contact header of the “200 OK” response, and sends it to the SIP server 3. "200
An "OK" response is transmitted (step S3, connected call port notification step).

Subsequently, the SIP server 3 includes a Contact header in which the port number of the connected call dedicated port 12 is set to “200”.
The “OK” response is received and transferred to the originating terminal 2 connected to the SIP server 3. Then, the calling-side terminal 2 receives the transmission destination port number of the receiving-side terminal 1 “200
The port number of the receiving terminal 1 set in the Contact header included in the “OK” response is changed, and the “ACK” request is transmitted. The SIP server 3 receives the request and forwards it to the receiving terminal 1. (Step S4). At this time, the SIP reception port change procedure is completed, and from now on, the originating terminal 2 transmits a SIP signal toward the connected call dedicated port 12. Also, the receiving terminal 1 receives the SIP signal transmitted from the transmitting terminal 2 through the connected call dedicated port 12 (connected call signal receiving step). At the same time, a session is established between the caller and callee terminals and the service can be started (step S5).

Thereafter, when exchanging the SIP signal, since the SIP signal transmitted from the originating side terminal 2 to the terminating side terminal 1 is a connected call, the terminating side terminal 1 receives it at the connected call dedicated port 12. For example, a “BYE” request is transmitted from the calling terminal 2 through the SIP server 3 to the connected call dedicated port 12 in order to end the session (step S 6). From port 11 to “200
"OK (BYE)" is transmitted (step S7).

  Here, FIG. 4 shows a flowchart of the reception process by the above-described connected call dedicated SIP receiving unit 14. First, when a call signal during connection is received (step S11), when there are a plurality of sessions, a message is analyzed such as obtaining necessary information in order to identify which session (step S12). Subsequently, as a result of obtaining the session information of the received connected call signal, it is determined whether or not it is a newly connected call signal (step S13). If the received SIP signal is a new connection call signal (step S13: YES), an error response is returned and the connection is rejected (step S14). If it is not a newly connected call signal (step S13: No), the received connected call signal is sent to the SIP processing unit 15 for processing (step S15).

  As described above, according to the present invention, the provision of the connected call dedicated port prevents the SIP signal from overflowing at the receiving port when a large amount of newly connected call signals arrives, and avoids discarding the SIP signal. And retransmission processing can be reduced. Accordingly, it is possible to reduce the cause of session disconnection due to a delay in response to a connected call, timeout, etc., minimize the influence on the processing of a connected call, and provide a stable service.

  In addition, since the SIP signal receiving port is divided into two, it is not necessary to increase the buffer size so that the session of the connected call is not disconnected when it is congested, compared to the case where the SIP signal is received by one receiving port. Furthermore, the buffer size of the newly connected call port can be reduced.

The receiving terminal 1 may be a mobile phone terminal having only one line, or a terminal (User) that accommodates a plurality of lines.
A communication device having an Agent function may be used. Thereby, it is possible to perform stable communication with any corresponding device.

  In addition, the Contact header is used to notify the calling terminal 2 of the port number of the connected call dedicated port 12, but the SIP header is expanded in the future including the existing header, If a port change can be notified using a newly defined header, another header may be used.

  INDUSTRIAL APPLICABILITY The present invention can be used for a communication apparatus that performs communication using a call control protocol, such as an IP telephone or a media server, and has industrial applicability.

It is a block diagram which shows the structure of the whole communication system. It is a block diagram which shows the structure of a receiving side terminal. It is a sequence diagram which shows operation | movement of the receiving side terminal. It is a flowchart which shows reception operation | movement in the call-dedicated port during connection of a receiving side terminal. It is a block diagram which shows the structure of the receiving side terminal in a prior art example. It is a sequence diagram which shows operation | movement of the receiving side terminal in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Termination side terminal 2 Origination side terminal 3 SIP server 11 New connection call port 12 Connected call dedicated port 13 New connection call SIP reception unit 14 Connected call dedicated SIP reception unit 15 SIP processing unit

Claims (15)

A communication device that establishes a session with another communication device using a call control protocol and performs communication,
A new call port for receiving a new call signal transmitted at the time of a new call from the calling communication device, and a connection for receiving a call control signal transmitted from the calling communication device after receiving the new call signal A medium call port,
A communication device. Comprising a connected call port notification means for notifying a port number of the connected call port to the calling communication device that has transmitted the new call signal received at the new call port;
The communication apparatus according to claim 1 . The connected call port notifying means notifies the calling communication device of the port number of the connected call port before the next call control signal is transmitted from the calling communication device. ,
The communication device according to claim 2 . Port setting means for setting an arbitrary port number different from the new call port as the connected call port,
The communication apparatus according to claim 2 or 3, wherein A function of processing the call control signal when a call control signal different from the new call signal is received at the new call port;
5. The communication apparatus according to claim 1, 2, 3 or 4 . Buffer setting means for setting the capacity of each buffer for temporarily storing call control signals respectively received at the new call port and the connected call port;
6. The communication apparatus according to claim 1, 2, 3, 4 or 5 . Available multi-line, the communication apparatus according to claim 1, 2, 3, 4, 5 or 6, wherein a. A communication method by a communication device that establishes a session with another communication device using a call control protocol and performs communication,
A new call signal receiving step for receiving a new call signal transmitted at the time of a new call from the calling side communication device at the new call port, and a call control signal transmitted from the calling side communication device thereafter being connected A connected call signal receiving step for receiving at the call port;
A communication method characterized by the above. A connection for notifying a port number of the connected call port to the calling communication device that has transmitted the received new call signal between the new call signal receiving step and the connected call signal receiving step. Having a middle call port notification step;
The communication method according to claim 8 . A port setting step of setting an arbitrary port number different from the new call port as the connected call port before at least the connected call port notifying step;
The communication method according to claim 9 . A communication method by a calling communication device and a called communication device that establishes a session with each other using a call control protocol and performs communication,
The calling communication device transmits a new call signal to a new call port set in the called communication device, and the called communication device transmits the new call signal to the new call port. Received at
Thereafter, the calling communication device transmits a call control signal different from the new call signal to the connected call port set in the called communication terminal, and the call control signal is transmitted to the incoming call port. Side communication device receives at the connected call port;
A communication method characterized by the above. After the receiving communication device receives the new call signal from the calling communication device, the calling communication device notifies the calling communication device of the port number of the connected call port;
The calling communication device transmits the call control signal different from the new call signal to the connected call port based on the notified port number;
The communication method according to claim 11 . A communication device that establishes a session with another communication device using a call control protocol and performs communication.
A new call signal receiving step for receiving a new call signal transmitted at the time of a new call from the calling side communication device at the new call port, and a call control signal transmitted from the calling side communication device thereafter being connected A connected call signal receiving process for receiving at the call port;
A program for running A port of the connected call port for the calling communication device that has transmitted the received new call signal to the communication device between the new call signal receiving step and the connected call signal receiving step. 14. The program according to claim 13 , for executing a connected call port notification step of notifying a number. Claim for causing the communication device to execute a port setting step of setting an arbitrary port number different from the new call port as the connected call port at least before the connected call port notifying step Item 15. The program according to Item 14 .

Images