CN1870702B - Method and system for controlling hairpin connection - Google Patents

Abstract

This invention discloses a method for controlling barrette connections including: A, a MGC obtains the current supporting ability of said MG to the barrette connection from the parameter showing the supporting ability of the MG to the connection of barrettes at the present, B, the MGC decides the control mode based on the supporting ability of the MG to the barrette connection and sends related control parameters. This invention also provides a system for controlling the barrette connection and a method for controlling it.

Description

Method and system for controlling hairpin connection

technical field

The invention relates to the communication field, in particular to a method and system for controlling hairpin connections.

Background technique

Media Gateway Controller (MGC) and Media Gateway (MG) are two key components in a packet network. The MGC is responsible for the call control function, and the MG is responsible for the service bearer function. The two work together to realize the separation of the call control plane and the service bearer plane, so as to fully share network resources, simplify equipment upgrades and service expansion, and greatly reduce development and maintenance costs.

As shown in Figure 1, the media gateway control protocol is the main protocol for communication between the MG and the MGC. Currently, two protocols, H.248/MeGaCo and MGCP, are widely used. Among them, the MGCP protocol version 1 was formulated by the Internet Engineering Task Force (IETF) in October 1999 and revised in January 2003, and the H.248/MeGaCo protocol version 1 was formulated by the IETF and the International Telecommunication Union (ITU) in November 2000. Jointly formulated and revised in June 2003, H.248 protocol version 2 was formulated by ITU in May 2002 and revised in March 2004, H.248 protocol version 3 was formulated by ITU in July 2005 and is yet to be released.

Taking the H.248 protocol as an example, various resources on the MG are abstractly expressed as Termination.

Terminals are further divided into Physical terminals and Ephemeral terminals. The former represents some physical entities with semi-permanent existence, such as time division multiplexing (TDM) channels, etc., and the latter represents some public resources released after temporary application. , such as: Real-time Transport Protocol (RTP) streaming, etc. The combination between terminals is abstractly represented as a context (Context). A context can contain multiple terminals, so topology (Topology) is used to describe the relationship between terminals. For terminals that have not yet been associated with other terminals, they are contained by a special context called a Null context.

Based on the abstract model of the protocol, the connection of the call is actually an operation on the terminal and the context. This operation is accomplished through command (Command) request and response between MGC and MG. Command types include Add, Modify, Subtract, Move, AuditValue, AuditCapabilities, Notify, and ServiceChange. Command parameters, also called descriptors (Descriptor), are classified into properties (Property), signals (Signal), events (Event), statistics (Statistic). Parameters with business relevance are logically aggregated into packages.

A typical IP voice call model contains two terminals in a context, one is a physical terminal representing a TDM channel, and the other is a temporary terminal representing an RTP stream. Media conversion between a TDM channel and an RTP stream. In addition, there is one such context on each of the two MGs, and they are interconnected based on the IP network through the above RTP flow, that is, the media conversion is in the form of TDM to RTP and then to TDM, so between the above two TDM channels A voice-over-IP call is also established.

However, when the above two TDM channels are on the same MG, if the MG can directly interconnect the two TDM channels, it is actually not necessary to forward them through the RTP stream. Reflected on the call model, a context directly includes two physical terminals that both represent TDM channels, and the interconnection of these two terminals in the context means the interconnection between TDM channels. This can not only reduce the resource consumption of media conversion, but also improve the service quality of media transmission. Such a call established between terminals (such as a TDM channel) on one MG is called a local connection or a hairpin (Hairpin) connection.

On the premise that the MG can support the direct interconnection of TDM channels, if the MGC can determine that the two parties involved in the call are on the same MG, then the MGC can instruct the MG to establish a call according to the call model involving two physical terminals in one context, It is called a hairpin connection in a controlled mode; if the MGC cannot determine, but the MG can determine that the two parties involved in the call are on the same MG, then the MGC can follow a call that contains a physical terminal and a temporary terminal in each of the two contexts. The model instructs the MG to establish a call, and the MG directly interconnects the two physical terminals without allocating resources (for example: digital signal processor DSP) for media conversion between TDM and RTP, which is called an autonomous hairpin connection. The interaction between MGCs and MGs for hairpin junctions currently lacks a mechanism to distinguish between the two situations and act accordingly.

At the same time, some services may need to prevent the MG from establishing a hairpin connection, for example, the IP loopback continuity detection service requires avoiding the hairpin connection. When the MG supports the hairpin connection in the above-mentioned autonomous mode, but needs to avoid establishing the hairpin connection, the interaction between the MGC and the MG for the hairpin connection currently lacks a mechanism for controlling the autonomous capability of the MG's hairpin connection.

Contents of the invention

The present invention provides a method and system for controlling hairpin connection, which is used to solve the problem that the prior art cannot control the hairpin connection according to the hairpin connection capability of the media gateway.

The inventive method comprises steps:

A. The media gateway controller MGC obtains the current support capability of the MG for the hairpin connection from the parameter reflecting the current support capability of the media gateway MG for the hairpin connection;

B. The MGC determines the control mode according to the current support capability of the MG for the hairpin connection, and issues corresponding control parameters for control.

The parameters reflecting the current capability of the MG to support the hairpin connection are configured on the MG.

The parameters reflecting the current support capability of the MG for the hairpin connection are defined by extending the media gateway control protocol.

In the step A, the MGC obtains the support capability through an audit value command in the media gateway control protocol.

The parameters reflecting the current capability of the MG to support the hairpin connection can also be configured on the MGC.

The value of the parameter reflecting the current capability of the MG to support the hairpin connection is controlled, autonomous or invalid; wherein the controlled means that the MG supports the establishment of a hairpin connection judged and instructed by the MGC; the autonomous means that the The MG supports independent judgment and establishment of a hairpin connection; the invalidity means that the MG does not support establishment of a hairpin connection.

In the step B, if the current capability of the MG to support the hairpin connection is controlled, the MGC judges and instructs to establish the hairpin connection; if the current capability of the MG to support the hairpin connection is autonomous, the MGC instructs The MG establishes a common IP voice call, or the MG judges and establishes a hairpin connection independently; if the MG currently supports the hairpin connection is invalid, the MGC does not need to judge and instruct to establish a hairpin connection.

Another method of the present invention is used to control the hairpin connection in the MG autonomous mode when it is predicted that the media gateway MG has the hairpin connection autonomy capability, comprising the following steps:

A. Set control parameters on the MG for controlling the autonomous capability of the MG hairpin connection;

B. The MG correspondingly enables or disables the autonomous capability of the hairpin connection according to the value of the control parameter issued by the MGC.

The parameters for controlling the autonomy capability of the MG hairpin connection are defined by extending the media gateway control protocol.

In the step A, the value of the parameter controlling the autonomous capability of the hairpin connection of the MG is sent to the MG through the media gateway controller MGC.

The value of the parameter controlling the autonomous capability of the MG hairpin connection is set through the MG background.

The value of the parameter controlling the autonomous capability of the MG hairpin connection is on or off; the ON means enabling the autonomous capability of the MG hairpin connection; the OFF means disabling the autonomous capability of the MG hairpin connection.

The system for controlling the connection of the present invention is used for controlling the hairpin connection, comprising: a media gateway MG and a media gateway controller MGC connected to each other; the MG is used for performing the hairpin connection operation, and the MGC is used for sending the The MG issues control parameters for controlling the hairpin connection operation of the MG and the autonomy capability of the hairpin connection.

The MG reports its current ability to support the hairpin connection to the MGC, and the MGC determines the control mode for the hairpin connection according to the MG's current ability to support the hairpin connection, and issues a hairpin control method for the MG. The control parameters of the connection operation are controlled.

The MG correspondingly enables or disables its autonomous capability for the hairpin connection according to the MG hairpin connection autonomy control parameter issued by the MGC.

The beneficial effects of the present invention are as follows:

In the present invention, by setting parameters for reflecting the current hairpin connection capability of the MG, the MGC can obtain the current hairpin connection capability of the MG, and determine the hairpin connection control mode accordingly. The parameters reflecting the current hairpin connection capability of the MG can be configured on the MG through the extended media gateway control protocol, and obtained by the MGC through the audit command of the media gateway control protocol, or configured on the MGC to be directly understood by the MGC.

In the present invention, by setting parameters for controlling the autonomous hairpin connection capability of the MG, it is possible to control whether to enable the autonomous hairpin connection capability as required when the MG is known in advance to have the autonomous hairpin connection capability. The parameter controlling the autonomous capability of the MG hairpin connection is set on the MG, and its value can be sent from the MGC to the MG through the extended media gateway control protocol, or can be directly set on the MG through the background.

The present invention also provides a system for controlling connections for supporting the method of the present invention.

Description of drawings

Figure 1 is a schematic diagram of an existing networking;

Fig. 2 is a schematic diagram of the system of the present invention;

Fig. 3 is a flowchart of the method steps of the present invention.

Detailed ways

In order to control the hairpin connection capability of the media gateway MG, the present invention provides a system, as shown in FIG. 2, which includes: a media gateway MG for performing a hairpin connection operation, and connected to it for controlling the hairpin connection operation Media Gateway Controller MGC.

The MG reports its current ability to support the hairpin connection to the MGC, and the MGC determines the control mode for the hairpin connection according to the current ability of the MG to support the hairpin connection, and sends corresponding control parameters to implement control. The MG correspondingly enables or disables its autonomous capability for the hairpin connection according to the MG hairpin connection autonomy control parameter issued by the MGC.

Applying the above-mentioned system, the present invention provides a method for controlling the hairpin connection, as shown in Figure 3, comprising the following steps:

S0, a preparation step for setting related parameters.

S1. The MGC acquires the current hairpin connection capability parameter value of the MG, and determines a hairpin connection control method based on the value.

S2. The MG enables or disables its hairpin connection autonomy capability according to the hairpin connection autonomy capability control parameter value.

S3. The connection is completed.

In order for the MGC to know the current hairpin connection capability of the MG, the method of the present invention extends an attribute parameter in the media gateway control protocol (eg H.248) to reflect the current hairpin connection capability of the MG. The attribute parameter can be defined in an existing package of the protocol, or can be defined in a new package of the protocol.

For example: the new package is named as Hairpin Connection (Hairpin Connection), and the attribute parameter is named as Hairpin Connection Capability (Hairpin Connection Capability), this parameter is an enumeration (Enumerate) type, and its parameter value can be It can be controlled (Controlled), autonomous (Autonomic) or invalid (Invalid), and it can be defined that this parameter has no default value and is read-only.

If the value of the parameter is controlled, it means that the MG supports the determination and instruction of the MGC to establish a hairpin connection; if the value is autonomous, it means that the MG supports independent judgment and establishment of a hairpin connection; if the value is invalid, then Indicates that the MG does not support the establishment of hairpin connections.

In order for the MGC to control the ability of the MG to independently determine and establish a hairpin connection when necessary (for example: the IP loopback continuity detection service requires avoiding a hairpin connection), the method of the present invention is implemented in a media gateway control protocol (such as H.248) In addition, an attribute parameter is extended to control whether the autonomy capability is enabled when the MG supports the autonomy capability. The attribute parameter can be defined in an existing package of the protocol, or can be defined in a new package of the protocol.

For example: in the above-mentioned same Hairpin Connection package, the attribute parameter is named Enable Autonomy (Enable Autonomy), this parameter is an enumeration type, its parameter value can be on (On) or off (Off), and can be defined The default value is On, and the parameter can be read and written.

The value of this attribute parameter is On, which means that the autonomous capability of the MG for the hairpin connection is enabled (that is, it can be enabled).

The value of this attribute parameter is Off, which indicates that the autonomous capability of the MG for the hairpin connection is disabled (that is, disabled).

The method of the present invention is specifically described below through three examples.

Method example 1: The parameter value of the current hairpin connection capability of the MG is controlled.

S100. Set a parameter on the MG to reflect the current hairpin connection capability of the MG. In this example, the value is controlled. This step is a preparatory step before the process starts.

S101. The MGC obtains the current hairpin connection capability parameter value of the MG, and determines a hairpin connection control mode based on the value.

The MGC sends an audit value (Audit Value) request command to the MG, requesting to audit the current value of the hairpin connection capability parameter in the hairpin connection packet.

After receiving the audit value request command, the MG sends an audit value response command to the MGC, where the audit value response command carries the current value of the hairpin connection capability parameter in the hairpin connection packet. In this example the value is Controlled.

After receiving the audit response message, the MGC learns from it that the current hairpin connection capability parameter value of the MG is controlled. Based on this, it is determined that the MG can establish a hairpin connection according to the instruction of the MGC.

In this way, when the MGC determines that the current call is a hairpin connection, it does not need to deliver the hairpin connection autonomy control parameter to instruct the MG to enable or disable its hairpin connection autonomy, that is, step S102 is skipped and step 103 is directly executed.

S102. The MG enables or disables its hairpin connection autonomy capability according to the hairpin connection autonomy capability control parameter value.

S103. Complete the connection.

The MGC sends an Add request command to the MG, instructing the MG to establish a hairpin connection according to the call model including two physical terminals in one context;

According to the instructions of the MGC, the MG directly interconnects the TDM channels represented by the two physical terminals to establish a hairpin connection, and sends an Add response command to the MGC.

This completes the call connection.

Method Example 2: The parameter value of the current hairpin connection capability of the MG is autonomy.

S200. Set a parameter on the MG to reflect the current hairpin connection capability of the MG. In this example, the value is autonomous. (This step is the same as Example 1 except for the parameter value)

S201. The MGC obtains the current hairpin connection capability parameter value of the MG, and determines a hairpin connection control mode based on the value.

The MGC sends an audit value (Audit Value) request command to the MG, requesting to audit the current value of the hairpin connection capability parameter in the hairpin connection packet.

After receiving the audit value request command, the MG sends an audit value response command to the MGC, where the audit value response command carries the current value of the hairpin connection capability parameter in the hairpin connection packet. In this example the value is Autonomous.

After receiving the audit response message, the MGC learns from it that the current hairpin connection capability parameter value of the MG is autonomous. Based on this, it is determined that the MG can independently determine and establish a hairpin connection.

There are two situations here:

If the MGC judges that there is no need to restrict the autonomous capability of the MG's hairpin connection (for example: judging that the current service does not need to avoid the hairpin connection), then the MGC does not need to judge whether the current call is a hairpin connection, and can skip step S202 and directly execute step S203 .

If the MGC requires that the MG avoid independent judgment and establishment of a hairpin connection (for example, the establishment of a hairpin connection is required to be controlled by the MGC, or some service applications need to avoid the establishment of a hairpin connection), the MGC sends a message containing a hairpin connection to the MG. A command for controlling parameters of the hairpin connection autonomy capability, where the value of the hairpin connection autonomy control parameter is disabled.

S202. The MG enables or disables its hairpin connection autonomy capability according to the hairpin connection autonomy capability control parameter value.

The MG obtains the hairpin connection autonomy parameter value as disabled from the command containing the hairpin connection autonomy control parameter, and accordingly disables the hairpin connection autonomy of the MG.

S203. Complete the connection.

Corresponding to two situations in step S201:

If the MGC judges that there is no need to limit the autonomous capability of the hairpin connection of the MG, it sends an Add request message to the MG, and instructs the MG to establish a normal IP voice call according to the call model in which each of the two contexts includes a physical terminal and a temporary terminal. If the MG independently judges that the current call is a hairpin connection (for example: it is found that both parties involved in the call use the same IP address), then the media conversion resources (for example: DSP) between TDM and RTP are not allocated, and the two TDM Channel interconnects implement hairpin connections.

If the MGC requests to prevent the MG from independently establishing a hairpin connection, then in step 202, the MG can no longer autonomously judge whether the current call is a hairpin connection according to the value of the hairpin connection autonomy control parameter value. resource. In this way, whether to establish a hairpin connection is completely controlled by the MGC. If a hairpin connection needs to be established, the MGC sends an Add request command to the MG, instructing the MG to establish a hairpin connection according to a call model containing two physical terminals in one context. pinch connection; if there is no need to establish a hairpin connection, the MGC sends an Add request command to the MG, instructing the MG to instruct the MG to establish a normal IP according to the call model in which each of the two contexts includes a physical terminal and a temporary terminal. voice call.

In both cases, the MG keeps the same context and terminal as the MGC, and sends an Add response command to the MGC.

Method Example 3: The parameter value of the current hairpin connection capability of the MG is invalid.

S300. Set a parameter on the MG to reflect the current hairpin connection capability of the MG. In this example, the value is autonomy. (This step is the same as Example 1 except for the parameter value)

S301. The MGC obtains the current hairpin connection capability parameter value of the MG, and determines a hairpin connection control mode based on the value.

The MGC sends an audit value (AuditValue) request command to the MG, requesting to audit the current value of the hairpin connection capability parameter in the hairpin connection packet.

After receiving the audit value request command, the MG sends an audit value response command to the MGC, where the audit value response command carries the current value of the hairpin connection capability parameter in the hairpin connection packet. In this example the value is invalid.

After receiving the audit value response command, the MGC learns that the current hairpin connection capability parameter value of the MG is invalid. Based on this, it is determined that the MG does not support the establishment of a hairpin connection.

Since the MG does not support the establishment of a hairpin connection, the MGC does not need to judge whether the current call is a hairpin connection, and may skip step S302 and directly execute step S303.

S302. The MG enables or disables its hairpin connection autonomy capability according to the hairpin connection autonomy capability control parameter value.

S303. Complete the connection.

Since the MGC in this example knows that the MG does not support the establishment of a hairpin connection through the current value of the hairpin connection capability parameter, no matter whether the MGC knows that the current call is a hairpin connection through judgment, it can only The MG sends an Add request message, and instructs the MG to establish a normal IP voice call according to the call model in which each of the two contexts includes a physical terminal and a temporary terminal.

The MG and the MGC keep the same context and terminal, that is, create an IP voice call in the form of media conversion from TDM to RTP to TDM, and send an Add response command to the MGC.

The parameters reflecting the hairpin connection capability and the control parameters of the hairpin connection autonomy involved in the above inventive method can be used together (such as the above three examples), or can be used separately. For example, the MGC can know the current hairpin connection capability of the MG through the parameter reflecting the hairpin connection capability, but does not interfere with the hairpin connection autonomy capability of the MG (if any).

When it is predicted that the MG has the hairpin connection autonomy capability, the MGC may also control its hairpin connection autonomy capability through the hairpin connection autonomy control parameter, and then control whether to establish a hairpin connection according to the instructions issued by the MGC.

The parameter reflecting the hairpin connection capability involved in the above inventive method can be configured on the MG, and as an extended attribute of the media gateway protocol (such as H.248), the MGC can obtain it from the MG through the audit value command (as in the above example), or it can be Configured on the MGC and directly understood by the MGC.

The hairpin connection autonomy control parameter involved in the above inventive method can be set as an extended attribute sent by the MGC to the MG through a media gateway protocol (such as H.248) (as in the above example), or can be set directly on the MG Through background configuration.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention belong to the scope of the claims of the present invention and equivalent technologies thereof, the present invention is also intended to include these modifications and variations.

Claims (14)

1. the method for a control connection is used to control hair clip and connects, and it is characterized in that, comprises the following steps:

A, media gateway controller MGC obtain the current tenability that hair clip is connected of this MG from the parameter that is used for reflecting the current tenability that hair clip is connected of media gateway MG;

B, MGC be according to the current tenability decision control mode that hair clip is connected of described MG, and issue the control corresponding parameter and control.

2. method according to claim 1 is characterized in that, the parameter configuration of the current tenability that hair clip is connected of described reflection MG is on MG.

3. as method as described in the claim 2, it is characterized in that, define the parameter of the current tenability that hair clip is connected of described reflection MG by the extended medium gateway control protocol.

4. as method as described in the claim 3, it is characterized in that MGC obtains described tenability by the audit value order in the MGCP in the described steps A.

5. method according to claim 1 is characterized in that, the parameter configuration of the current tenability that hair clip is connected of described reflection MG is on MGC.

6. as claim 1 to 5 method as described in each, it is characterized in that the parameter value of the current tenability that hair clip is connected of described reflection MG is controlled, autonomous or invalid;

The described MG of wherein said controlled expression supports to judge that by MGC setting up hair clip with indication is connected;

The described MG of described autonomous expression supports independently to judge and sets up hair clip and be connected;

The described MG of described invalid representation does not support to set up hair clip and connects.

7. method according to claim 1 is characterized in that, among the described step B,

If the current tenability that hair clip is connected of described MG is controlled, then MGC judges that setting up hair clip with indication is connected;

If the current tenability that hair clip is connected of described MG be autonomous, then MGC indication MG sets up common ip voice calling, and perhaps MG independently judges and sets up hair clip and be connected;

If the current tenability that hair clip is connected of described MG is invalid, then MGC need not to judge that setting up hair clip with indication is connected.

8. the method for a control connection is used for when precognition media gateway MG has hair clip connection capacity of self-government, and the hair clip of the autonomous mode of control MG connects, and it is characterized in that, comprises the following steps:

A, on MG, be provided for controlling the Control Parameter that the MG hair clip connects capacity of self-government;

The corresponding unlatching of value of the described Control Parameter that B, MG issue according to MGC or close the capacity of self-government that hair clip is connected.

9. as method as described in the claim 8, it is characterized in that, define the parameter that described control MG hair clip connects capacity of self-government by the extended medium gateway control protocol.

10. as method as described in the claim 9, it is characterized in that the value that control MG hair clip connects the parameter of capacity of self-government in the described steps A issues to described MG by media gateway controller MGC.

11., it is characterized in that described control MG hair clip connects the parameter value of capacity of self-government for opening or closing as claim 8 to 10 method as described in each;

Wherein said game clock shows that enabling described MG hair clip connects capacity of self-government;

Described pass represent to deenergize described MG hair clip connects capacity of self-government.

12. the system of a control connection is used to control hair clip and connects, and it is characterized in that, comprising: interconnective media gateway MG and media gateway controller MGC;

Described MG is used to carry out the hair clip attended operation, and described MGC is used for issuing the hair clip attended operation of control MG and the Control Parameter of the capacity of self-government that hair clip connects to described MG.

13. as system as described in the claim 12, it is characterized in that, described MG reports described MGC with its current tenability that hair clip is connected, the described MGC control mode that the current tenability decision that hair clip is connected connects hair clip according to described MG, and the Control Parameter that issues the hair clip attended operation of control MG is controlled.

14., it is characterized in that described MG connects the capacity of self-government Control Parameter according to the MG hair clip that described MGC issues as system as described in the claim 12, corresponding unlatching or close the capacity of self-government that it connects hair clip.

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