JP2005333411A - Voip system, session setting control method therefor, and control unit used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform setting regarding voice quality in an IP telephone device by uniforming each CPU resource when a plurality of gateway devices are available in a VOIP system, and to prevent the voice quality from being deteriorated by the shortage of the CPU resources without using a high-throughput CPU. <P>SOLUTION: A control unit 2 is connected to an IP network 1, and has a function for monitoring the CPU resources in the gateway devices 3, 4 connected to the IP network and a capability table for relating codec information required when the gateway devices 3, 4 establish sessions with opposing devices in call, packet transmission interval information, and the order of priority in a session control database. When the session with the IP telephone device 5 connected to the IP network is established, the CPU resources in the gateway devices 3, 4 are compared with the processing capability table in the control unit 2, and the session establishment with the gateway devices having a number of CPU resources is instructed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a VOIP system, a session setting control method thereof, and a control device used therefor, and in particular, includes a plurality of gateway devices and a control device for controlling these gateway devices, and transmits voice packets and sessions via an IP (Internet Protocol) network. The present invention relates to a session setting control method in a VOIP (Voice Over IP) system that performs control.

  2. Description of the Related Art Conventionally, in a VOIP system, a gateway device used for connection to an external network is a voice transmission protocol implementation device on an IP network, a buffer device that holds voice packets for a certain period of time, and a signal that performs compression conversion of voice data It consists of a processor and an interface device for each network.

  In the gateway device, voice data input from each network is compressed and packetized by a signal processor and transferred to the IP network. However, the voice packet received from the IP network is lost due to the nature of the IP network. Or, since there is a possibility of delay, after holding for a predetermined time in the apparatus, the signal processor decompresses and converts the voice packet and sends it to the opposite network.

  Control of voice data and call quality in the gateway device is performed only for one call, and the voice quality of the device including the other calls accommodated by the gateway device or the VOIP system as a whole is controlled. There is no guarantee of control.

  Since a gateway apparatus generally has a plurality of voice channels, a CPU that controls IP packets is required to have a large amount of processing capability. In general, the number of channels that can be controlled simultaneously by one gateway device is determined by the number of channels of the connected network (non-IP network side). In this case, the codec with the highest CPU load when all channels are used, Even when the packet transmission cycle is set, a CPU and a device configuration capable of high-speed processing are applied so that CPU resources are not insufficient and voice quality is not deteriorated.

  In an environment where the traffic is relatively low so that all channels are not used simultaneously, or in an environment where packet transmission delay and high quality codec (64 kbps, etc.) are not a problem, this configuration is also cost effective. It becomes a problem.

Here, with reference to Patent Document 1, there is described a technique in which CPU resources are monitored in VOIP service quality control, and voice codec type, priority processing of packet processing for each session, and the like are dynamically changed. .
JP 2003-46563 A

  However, the above-described technology is a call quality control method in which the resources of the CPU are monitored for each device, and quality control or the same function is performed in the entire system, such as when a plurality of gateway devices are connected in a VOIP system. Cooperation with a plurality of VOIP devices is not studied.

  It is an object of the present invention to make settings related to the voice quality of an IP telephone device so that the CPU resources of each gateway device can be equalized when a plurality of gateway devices are available. It is an object to provide a VOIP system, a session setting control method thereof, and a control device used therefor, which can prevent deterioration of voice quality due to shortage without using a high processing capacity CPU.

  The VOIP system according to the present invention is a VOIP (Voice Over IP) system that includes a plurality of gateway devices and a control device that controls these gateway devices, and performs voice packet transmission and session control via an IP (Internet Protocol) network. The control device, in response to a call connection request from the IP telephone terminal, sets up a session for the call connection according to the current processing status of each of the plurality of gateway devices. Including means for determining.

  A session setting control method according to the present invention is a session setting control method in a VOIP system that includes a plurality of gateway devices and a control device that controls these gateway devices, and performs voice packet transmission and session control via an IP network. In response to the call connection request from the IP telephone terminal, the control device determines a gateway device for setting the session for the call connection according to the current processing capacity of each of the plurality of gateway devices. Including the step of:

  A control device according to the present invention is a control device that controls a gateway device in a VOIP system that includes a plurality of gateway devices and performs voice packet transmission and session control via an IP network, and includes a call connection request from an IP telephone terminal. In response to the above, the gateway device includes means for determining a gateway device for setting up a session for the call connection in accordance with a current processing capability status of each of the plurality of gateway devices.

  The operation of the present invention will be described. In the VOIP system, the CPU resource of the gateway device installed on the IP network is collectively monitored by the control device installed on the IP network, so that the maximum number of lines can be dynamically changed by the CPU resource of the gateway device. When a plurality of gateway devices can be used, the CPU resources can be equalized so that the settings related to the voice quality of the IP telephone device can be easily set, and the voice quality is deteriorated due to the lack of CPU resources. This is what prevents high-throughput CPU without using it.

  More specifically, the control device that controls the gateway device has a function of monitoring CPU resources of the gateway device connected to the IP network, codec information and packets required when the gateway device establishes a session with the opposite device during a call. The CPU resource of each gateway device is compared with the processing capability table of each gateway device when a session is established with a terminal connected on the IP network, having a capability table associating transmission interval information and priority. If the CPU resources of each gateway device are the same and the resources are low, the CPU processing load is low as long as the existing calls are not affected. Session by codec type and packet transmission interval To indicate the opening.

  Further, the above control device includes a call connection control function for controlling the gateway device and the IP telephone device connected to the IP network, a CPU resource monitoring function for monitoring the CPU resource state of the gateway device, and the gateway device. When performing voice communication, a session control database for performing session control according to the CPU resource state of the gateway device and a packet transmission / reception function for transmitting / receiving control packets to / from each device via the IP network are provided.

  In addition, a packet transmission / reception function for transmitting / receiving voice packets and control packets from the control device to / from the gateway device, a codec function for converting voice data in the IP network and voice data in the public network, A line interface function for sending and receiving voice data via the network, a call connection control function for session control with an IP terminal connected by an instruction from the control device, and detecting CPU resources from the current call state And a CPU resource monitoring function for transmitting this to the control device.

  When a plurality of gateway devices are in the same CPU resource state at the time of establishing a session with a terminal connected to the IP network, a call is made from a gateway device with a high call priority, so that By setting the incoming call priority of high gateway devices low, the CPU resources of the gateway devices are made uniform.

  According to the first effect of the present invention, the CPU resources of a plurality of gateway devices are monitored by a single control device, thereby making it possible to guarantee a good call quality by equalizing the load on all the gateway devices.

  The second effect of the present invention is that when the CPU resource of the gateway device is reduced, by setting a restriction on the call session setting information, a call session is established with a light CPU load, and the voice of the entire gateway due to the CPU resource reduction is achieved. It is possible to prevent quality degradation and secure call quality.

  According to the third effect of the present invention, when a plurality of gateway devices are in the same CPU resource state, a call is issued from a gateway device having a high call priority, so that the call priority of the gateway device having a high call priority is By setting low, it is possible to make the CPU resources of the gateway devices uniform.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a VOIP system according to the present embodiment. A control device 2, gateway devices 3 and 4, and an IP telephone device 5 are connected to an IP network 1. The IP network 1 is connected to a public network 6 via gateway devices 3 and 4. A telephone device 7 is connected to the public network 6.

  FIG. 2 is a functional block diagram of the control device 2, the call connection control unit 21 for controlling the gateway devices 3 and 4 and the IP telephone device 5 connected to the IP network, and the CPU resource states of the gateway devices 3 and 4. A CPU resource monitoring unit 22 for monitoring, a session control database 23 for performing session control according to the CPU resource state of the gateway devices 3 and 4, and IP network when performing voice communication via the gateway devices 3 and 4. And a packet transmitting / receiving unit 24 for transmitting / receiving control packets to / from each device.

  The CPU resource monitoring unit 22 has a function of receiving a CPU resource notification of each gateway device from the gateway devices 3 and 4 every predetermined time and holding it. As shown in FIG. 4, the session control database 23 is a processing capability that is an information table required when the IP telephone device 5 and the gateway devices 3 and 4 connected to the IP network 1 establish a session with the opposite device during a call. Tables 200 (A), 300 (B), and 400 (C) are stored.

  Referring to (A), the capability table 200 of the IP telephone apparatus 5 is shown, and codec information 201, packet transmission interval (payload type) information 202, and priority order 203 are associated with each other. Referring to (B), the capability table 300 of the gateway device 3 is shown, and the codec information 301, the packet transmission interval information 302, and the priority order 303 are associated with each other. Referring to (C), the capability table 400 of the gateway device 4 is shown, and the codec information 401, the packet transmission interval information 402, and the priority order 403 are associated with each other.

  Further, in the tables 300 and 400 of (B) and (C), when the CPU resource states are the same, the transmission priority levels 305 and 405 for determining which one performs priority transmission connection are respectively set. include. Further, resource conditions 304 and 404 which are information for specifying each entry in the tables 300 and 400 are included.

  FIG. 3 is a functional block diagram of the gateway device 3, and the gateway device 4 has the same configuration as the gateway device 3, and is not particularly shown. As shown in FIG. 3, a call connection control unit 31 for performing session control with an IP telephone device connected by an instruction from the control device 2 and resources of the CPU 35 are detected from the current call state and the control device 2 is detected. CPU resource monitoring section 32 for reporting this, codec 33 for converting voice data in the IP network and voice data in the public network, voice packets and control packets from control device 2 The packet transmission / reception unit 34, the CPU 35, and a line interface 36 for transmitting / receiving voice data via the public network.

  The gateway devices 3 and 4 read the session state from the call connection control unit 31 by the CPU resource monitoring unit 32 at predetermined time intervals, calculate the CPU resource based on this, and send the CPU resource of the own device to the control device 2. It has a function to notify the situation.

As an example, if the gateway devices 3 and 4 have two types of codec types and two types of packet transmission cycles as session establishment capabilities, the CPU resource calculation method uses a CPU load L and a weight based on the codec type. If s1, s2, packet transmission periods are i1, i2, and the number of channels used by the combination of the codec and each packet transmission period is n1, n2, n3, n4, the following equation is obtained.
L = (s1 * i1 * n1) + (s1 * i2 * n2)
+ (S2 * i1 * n3) + (s2 * i2 * n4)

  Next, the voice quality control method of the IP gateway device of the present invention will be described with reference to FIG. In this example, for ease of explanation, it is assumed that the CPU resources in the gateway device are four levels of a, b, c, and d, and that the CPU resources increase in the order of a, b, c, and d. As an example, if the CPU resource state of the gateway device 3 is c, the session capacity setting shown in FIG. 4 means that session setting with the resource conditions c and d is possible.

  Next, the operation sequence of FIG. 5 will be described. The gateway device 4 monitors the resource state of the CPU of its own device every predetermined time and notifies the control device 2 of the resource status. It is assumed that the resource state in this example is b (step 301). Similarly, the gateway device 3 also notifies that the resource state of the CPU of its own device is a every predetermined time (step 302).

  When the IP telephone device 5 connects to the telephone device 7 connected to the public network 6, the IP telephone device 5 first requests the control device 2 to connect to the public network 6 (step 303). In the control device 2 that has received the request, the call connection control unit 21 reads the CPU resource status of the gateway devices 3 and 4 from the CPU resource monitoring unit 22, and the capability table and IP of the gateway devices 3 and 4 from the session control database 23. The capability table of the telephone device 5 is read, and the connection type that can guarantee the voice quality is calculated.

  More specifically, since the highest priority capability type of the capability table 200 of the IP telephone device 5 is the codec type 64 kbps and the packet transmission interval is 20 ms, both the gateway devices 3 and 4 can communicate. As a result of the CPU resource notification from the device, the gateway device 3 cannot use communication with a codec type of 64 kbps and a packet transmission interval of 20 ms due to a shortage of CPU resources because the CPU resource status is b. As a result, the call connection control unit 21 selects the gateway device 4 that has sufficient CPU resources and can ensure good call quality (step 304).

  When selection of the gateway device that can be used is completed, the call connection control unit 21 of the control device 2 issues a connection request to the public network 6 to the gateway device 4 (step 305). The gateway device 4 having received it connects to the public network 6 and receives a connection response from the public network 6 (step 306), and transmits a response notification to the control device 2 (step 307).

  Receiving this, the control device 2 transmits a session start instruction including the capability table shown in FIG. 6 from the call connection control unit 31 to the IP telephone device 5 and the gateway device 4 (step 308). The IP telephone apparatus 5 and the gateway apparatus 4 that have received this establish a session for starting a call with each other (step 309). In this example, the priority order of the mutual capability tables indicated by the bold lines in the table of FIG. The call is started with the highest codec of 64 kbps and the packet transmission interval payload of 20 ms (step 310).

  Next, a case where the resource status of the gateway devices 3 and 4 is both b (steps 501 and 502) will be described with reference to FIG. In this case, the control device 2 that has received a connection request from the IP telephone device 5 to the public network 6 in step 503 uses the capability table of the gateway devices 3 and 4 and the capability table of the IP phone device 5 in the call connection control unit 21. (Step 504), the resource table from each gateway device in Steps 501 and 502 indicates that the capability table of either gateway device has a codec of 64 kbps, which is the highest priority of the capability table of the IP telephone device, The packet transmission interval of 20 ms cannot be used (step 504).

  In this case, referring to the transmission priority levels 305 and 405 in the capability table of each gateway device shown in FIG. 4, the control device 2 makes a connection request to the gateway device 3 having a higher priority (step 505). The gateway device 3 that has received it connects to the public network 6 and receives a response from the public network 6 (step 506), and transmits a response notification to the control device 2 (step 507).

  Receiving this, the control device 2 transmits a session start instruction including the capability table shown in FIG. 8 to the IP telephone device 3 and the gateway device 3 (step 508). From the capability table sent to the gateway device 3 at this time, items of the highest priority codec 64 kbps and the packet transmission interval 20 ms are removed by the CPU resource control of the control device 2.

  The IP telephone apparatus 5 and the gateway apparatus 3 that have received this establish a session for starting a call with each other (step 509). In this example, the priority of the mutual capability table is the second codec 64 kbps, the packet transmission cycle A call is started in 40 ms (step 510).

  As in this example, when multiple gateway devices are in the same CPU resource state, the incoming call priority of the gateway device with the higher outgoing priority is set lower by making a call from the gateway device with the higher outgoing priority. By doing so, it is possible to make the CPU resources of each gateway device uniform.

It is a system configuration figure of an embodiment of the invention. It is a functional block diagram of the control apparatus 2 of FIG. It is a functional block diagram of the gateway apparatus 3 of FIG. It is a figure which shows the example of the table which shows the session establishment capability allocated to each VOIP apparatus in this Embodiment. It is a figure which shows an example of the outgoing call connection sequence from the IP telephone apparatus in this Embodiment. It is a figure which shows the example of the capability table contained in the session start instruction | indication in the operation | movement of FIG. It is a figure which shows the other example of the transmission connection sequence from the IP telephone apparatus in this Embodiment. It is a figure which shows the example of the capability table contained in the session start instruction | indication in the operation | movement of FIG.

Explanation of symbols

1 IP network
2 Control device 3, 4 Gateway device
5 IP telephone equipment
6 Public network
7 Telephone device 21, 31 Call connection control unit 22 CPU resource monitoring unit of gateway device 23 Session control database 24, 34 Packet transmission / reception unit 32 CPU resource monitoring unit 33 Codec 36 Line interface

Claims (12)

A VOIP (Voice Over IP) system that includes a plurality of gateway devices and a control device that controls these gateway devices, performs voice packet transmission and session control via an IP (Internet Protocol) network,
In response to a call connection request from an IP telephone terminal, the control device determines a gateway device that performs session setting for the call connection according to the current processing capacity status of each of the plurality of gateway devices. A VOIP system comprising means. Each of the plurality of gateway devices has means for reporting its current processing capability to the control device,
2. The VOIP according to claim 1, wherein the means of the control device determines a gateway device which makes the session setting by referring to a current processing capability reported from each of the gateway devices. 3. system.   The means of the control device associates codec information, packet transmission interval information, and priority information necessary for each of the plurality of gateway devices and the IP telephone terminal to establish the session with the opposite device during a call. A gateway device that has a processing capability table and refers to the current processing capability reported from each of the gateway devices and the contents of the processing capability table, respectively, to determine a gateway device for setting a session for the call connection. The VOIP system according to claim 2, wherein   4. The VOIP system according to claim 3, wherein said means of said control device controls to make a call from a device having a higher priority when there are a plurality of gateway devices having the same current processing capacity. A session setting control method in a VOIP (Voice Over IP) system that includes a plurality of gateway devices and a control device that controls these gateway devices and performs voice packet transmission and session control via an IP (Internet Protocol) network. ,
In the control device, in response to a call connection request from the IP telephone terminal, a gateway device for setting a session for the call connection is determined in accordance with a current processing capability status of each of the plurality of gateway devices. The session setting control method characterized by including a step. In each of the plurality of gateway devices, reporting the current processing capacity of the device to the control device,
6. The session according to claim 5, wherein the step of the control device determines a gateway device for the session setting with reference to a current processing capability reported from each of the gateway devices. Setting control method. In the control device, a processing capability table that associates codec information, packet transmission interval information, and priority information that are required when each of the plurality of gateway devices and the IP telephone terminal establishes the session with the opposite device during a call. Is stored in advance,
In the step of the control device, the gateway device for session setting for the call connection is determined with reference to the current processing capability reported from each of the gateway devices and the contents of the processing capability table. The session setting control method according to claim 6, wherein the session setting control method is performed.   8. The session setting control according to claim 7, wherein the step of the control device performs control so as to make a call from a device having a higher priority when there are a plurality of gateway devices having the same processing capability. Method. In a VOIP (Voice Over IP) system that includes a plurality of gateway devices and performs voice packet transmission and session control via an IP (Internet Protocol) network, the control device controls the gateway devices,
In response to a call connection request from an IP telephone terminal, a means for determining a gateway device for setting up a session for the call connection is included according to the current processing capacity status of each of the plurality of gateway devices. Control device characterized.   The control device according to claim 9, wherein the means determines a gateway device that performs the session setting with reference to a current processing capability reported from each of the gateway devices.   The means includes a processing capability table that associates codec information, packet transmission interval information, and priority information, which are necessary when each of the plurality of gateway devices and the IP telephone terminal establishes the session with the opposite device during a call. And determining the gateway device for setting the session for the call connection by referring to the current processing capability reported from each of the gateway devices and the contents of the processing capability table, respectively. The control device according to claim 10, wherein 12. The control apparatus according to claim 11, wherein said means controls to make a call from a device having a higher priority when there are a plurality of gateway devices having the same current processing capacity.

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