CN1816024A - Method for insuring telecommunication service quality in soft-exchanging network - Google Patents

Abstract

The invention discloses a method for ensuring communication QoS in a softswitch network. Firstly, through configuration, signaling and media streams are transmitted through a border gateway during a cross-domain call; the QoS control strategy of the network is configured on the softswitch device, including user , the QoS parameters and selection strategy of the border gateway, and configure its own QoS parameters on the border gateway; the calling access device initiates a cross-domain call, and after receiving the signaling, the softswitch device selects the QoS parameters that can be used by the user and sends them Send along with the signaling; after receiving the signaling, the border gateway sends the parameter along with the signaling when the current available bandwidth meets the requirements of the QoS parameter; the called access device decides to use the QoS parameter after receiving the signaling and sends it back The calling access device, the border gateway establishes a media forwarding channel for the call, and then the calling and called access devices communicate according to the agreed QoS parameters. The method of the invention can guarantee the business service quality, has small investment and simple networking.

Description

A Method of Guaranteeing Communication Service Quality in Softswitch Network

technical field

The invention relates to the communication field, and is applied to a realization method for ensuring communication QoS (quality of service) under the framework of a softswitch network system.

Background technique

The next-generation network based on softswitch equipment is a network architecture that provides users with various services such as voice, data and multimedia. It has three characteristics: 1. Openness; 2. Service-driven; 3. Packet-based network. The next generation network has become the development trend of the telecommunication network. In various services such as voice and multimedia provided by the softswitch network, their real-time requirements are very high, and the network needs to have a good QoS guarantee. Whether the softswitch network can guarantee QoS becomes the key to whether it can become a unified platform in the future.

For example, Figure 1 shows a schematic diagram of a softswitch network. In this network, from the operator's point of view, the network is divided into three parts: the operator's network N1, other operator's network N2 and two Users access the networks N3, N4.

The network N1 includes control devices such as softswitch devices and application servers, and access devices such as trunk gateways and user access gateways. All equipment is controlled by the operator, and intranet communication provides a QoS guarantee mechanism through network planning. The devices of network N2 and network N1 are the same (only a part is shown in the figure), but the QoS management policies are inconsistent. For network N1, if the data in network N2 directly enters network N1 without control, its QoS guarantee will be affected. Network N3 includes access devices such as IADs, IP phones, and video terminals, but does not belong to network N1. From the perspective of network N1, these devices are untrustworthy. If the data in network N3 directly enters network N1 without control, its QoS guarantee will be affected.

In the current network, there are various QoS solutions, such as resource agent model, priority promotion, authentication identification and so on.

The resource agent model scheme implements functions such as resource access permission control and resource reservation by adding resource control entities in the network, and completes the QoS guarantee for the network. The advantage of this solution is that the control granularity of the network is relatively fine, which can better meet the user's requirements for service quality. The disadvantage is that the existing network equipment does not support this function and needs to be updated, and the protocol is not mature.

The priority promotion scheme is a measurement-based admission control. This scheme relies on the behavior of the end system, and uses the end system to perform end-to-end measurement of network resources. After determining whether the network meets the user's service quality requirements, it is a kind of QoS guarantee. method. The advantage of the solution is that the changes to the existing network are small, but the disadvantage is that it lacks a global resource control strategy and cannot guarantee the rational utilization of the entire network resources.

The authentication identification scheme uses the authentication identification as the association between SIP and IP layers, that is, combines the COPS protocol with RSVP, so that network managers can centrally monitor and manage RSVP, and realize end-to-end resource reservation. The advantage of this solution is to effectively combine the call service with the bearer network to complete QoS control. The disadvantage is that it only supports the SIP protocol.

Among these solutions, there are few solutions that can be deployed and implemented on the operator's network at present. There are many reasons for this situation: firstly, the existing technology is not mature enough, and there are still deficiencies in performance, scalability, operability, etc.; secondly, the complexity of deployment, deploying QoS solutions on the entire network requires Adjust and reconfigure the entire network. Although the existing equipment generally supports QoS capabilities, the complexity of redeployment is high. Moreover, the reliability and actual effect of these solutions on a large scale still need to be verified.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for ensuring communication service quality in the softswitch network, which can guarantee the service quality of cross-domain communication in the softswitch network.

In order to solve the problems of the technologies described above, the present invention provides a method for ensuring communication service quality in a softswitch network, comprising the following steps:

(a) Setting border gateways at the borders of different networks, and configuring them so that when cross-domain calls are generated between networks, signaling and media streams are transmitted through the border gateways between networks;

(b) Configure the quality of service control strategy of the network on the softswitch device, including the quality of service parameters of users and border gateways and the strategy of selecting the quality of service parameters that can be used by call users, and configure their own quality of service parameters on the border gateway ;

(c) The calling access device initiates a cross-domain call. After receiving the signaling, the softswitch device selects the quality of service parameters that the user can use according to the quality of service parameters of the calling and called access devices and border gateways involved in the call. At that time, send the parameter to the next device along with the signaling, otherwise reject the call;

After receiving the signaling, the border gateway judges whether the current available bandwidth can meet the requirements according to the quality of service parameters in the signaling, and if so, sends the quality of service parameters to the next device along with the signaling, otherwise rejects the call;

(d) After receiving the signaling, the called access device decides to use the QoS parameter and sends it back to the calling access device through the border gateway and softswitch device through the signaling, and the border gateway establishes a media forwarding channel for the call , the calling and called access devices communicate according to the agreed service quality parameters.

Further, the above method may also have the following features: the user's QoS parameters include at least supported media types and/or bandwidth, and the border gateway's QoS parameters include at least forwardable media types and/or total bandwidth.

Further, the above-mentioned method can also have the following characteristics: in the step (d), the border gateway also records the media stream identification and the quality of service parameters adopted for this call, and identifies and identifies the two-way media stream after the call is connected , and measure the media flow, and limit the flow according to the set flow control strategy when the measured flow exceeds the requirements of the recorded service quality parameters.

Further, the above method can also have the following characteristics: the border gateway also measures the time delay, jitter and packet loss of the two-way media stream, and judges whether the requirements of the softswitch equipment for the bearer network are met, and if not, will report to the softswitch device, and the softswitch device determines whether to tear down the call.

Further, the above method can also have the following characteristics: the softswitch device in the step (b) is also configured with the resource distribution of the whole network; Afterwards, also judge whether the border gateway that this call passes through currently has sufficient bandwidth resources according to the resource distribution situation, if yes, then send the selected parameters with the signaling, otherwise reject the call; and in the step (d), The softswitch device also updates the resource usage of the entire network according to the finally adopted QoS parameter.

Further, the above method may also have the following characteristics: after receiving the signaling in the step (c), the border gateway first reserves the maximum required bandwidth within the currently available bandwidth range for it according to the quality of service parameter in the signaling resources, and modify the bandwidth according to the actually used QoS parameters in the step (d).

Further, the above-mentioned method may also have the following characteristics: the strategy of the step (c) that the softswitch selects the quality of service parameters available to the calling user is: on the basis that the border gateway currently has a corresponding amount of available resources, from Select the media and/or bandwidth supported by the calling and called access devices and the border gateways they pass through in the QoS parameters of the application.

Furthermore, the above method may also have the following feature: when there are multiple media and/or bandwidths supported by the calling and called access devices and the border gateway they pass through, select the one that requires a larger bandwidth.

Furthermore, the above method may also have the following characteristics: the transfer of the QoS parameter information between the access device, the border gateway and the soft switch device is included in the original standard signaling message.

As can be seen from the above, the present invention is based on the present situation of current softswitch network QoS guarantee, proposes a kind of on existing network, by disposing QoS policy on softswitch equipment, provides guaranteed QoS mechanism on border gateway, realizes softswitch network The cross-domain communication QoS assurance method can effectively improve the service quality of the softswitch network, increase the stability and security of the system, and ensure the real-time requirements of the network in communication. In particular, the method of the present invention can fully protect the existing investment of the operator, as long as a small amount of border gateway equipment is added to the existing bearer network, the quality of business service can be guaranteed; in terms of network construction, the solution is simple and feasible, reducing maintenance costs , and can ensure the rational utilization of the entire network resources.

Description of drawings

Fig. 1 is a schematic diagram of networking of a system including multiple networks.

FIG. 2 is a flow chart of QoS guarantee processing when a terminal accesses a softswitch network according to an embodiment of the present invention.

Fig. 3 is a flow chart of guaranteeing QoS when the softswitch network intercommunicates according to the embodiment of the present invention.

Detailed ways

The technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Still taking the networking in Figure 1 as an example, the following initial configuration is required for the softswitch network networking: access devices in the networks N1 and N2, and all their signaling is connected with the softswitch devices SS1 and SS2 in the respective networks Interaction, media streams interact directly between access devices. The signaling of devices in networks N3 and N4 interacts with their respective border gateways BG1 and BG2, and BG1 and BG2 distribute the signaling to softswitch devices SS1 and SS2 after receiving the signaling; when a cross-domain call occurs between networks , signaling and media streams must pass through the network border gateway.

On the softswitch device, it is necessary to configure and manage the resource distribution and QoS control policies of the entire network. Network-wide resource configuration is used to describe the number of connection resources between access devices in the network. The QoS control policy is used to configure the QoS parameters of users and border gateways for parameters such as bandwidth utilization and traffic volume. And according to the current network resource usage, for a new call application, the strategy of selecting the quality of service parameters that the calling user can adopt is based on parameters such as user attributes, equipment, application bandwidth, and service category.

Taking the configuration on the softswitch device SS1 in the network N1 as an example, this embodiment adopts static configuration of bandwidth parameters. The QoS parameter table storing access devices AD1, AD2 and border gateways BG1-BG3 is as follows:

In the QoS parameter table of the access device AD1: user ID: 101; supported media type: G.711/G.729/G.723; bandwidth: 600K (bps). G.711/G.729/G.723 is the media type, "/" means "and", that is, all three types are supported. According to the agreement, the occupied bandwidth of G.711 is 100Kbps, the occupied bandwidth of G.729 is 50Kbps, and the occupied bandwidth of G.723 is 30Kbps.

In the QoS parameter table of the access device AD2: user ID: 102; supported media type: G.729/G.723; bandwidth: 500K (bps);

In the QoS parameter table of the border gateway BG1: user ID: 103; supported media types: G.711/G.729/G.723; bandwidth: 500K (bps).

In the QoS parameter table of the border gateway BG2: user ID: 104; supported media types: G.711/G.729/G.723; bandwidth: 500K (bps).

In the QoS parameter table of the border gateway BG3: user ID: 105; supported media type: G.729/G.723; bandwidth: 500K (bps).

A border gateway is configured at the border of each network. As shown in the figure, a border gateway BG3 is placed at the junction of the network N1 and the network N2, and border gateways BG1 and BG2 are respectively placed at the junction of the network N1 and the networks N3 and N4.

Channels for signaling and media streams are set on the border gateway. The signaling channel transmits the signaling between the access device and the softswitch device. During the signaling process, the border gateway obtains the QoS parameters in the signaling, and establishes a communication between the two access devices according to the current call status. media stream channel. In the process of media forwarding, technologies such as service flow identification and labeling, resource allocation, flow measurement and limitation, priority sending, and service quality reporting are provided to ensure the QoS requirements of softswitch network cross-domain communication.

QoS parameters also need to be set in the border gateway, including the total bandwidth of the border gateway and supported media types. Assume that the QoS parameters set by the border gateways BG1, BG2, and BG3 in this embodiment are: total bandwidth: 40 Mbps; forwarding media type: G.711/G.729/G.723/H.263.

When the access device AD1 in the network N3 calls the access device AD2 in the network N4, the signaling flow in the originating direction is from AD1->BG1->SS1->BG2->AD2, the corresponding path shown in the figure It is S1, S2, S3, S4, and all signaling response messages are returned according to the original path. The media flow flows between AD1->BG1->BG2->AD2 or its reverse flow, and the illustrated paths are M1, M2 and M3. The signaling for the above interaction may be H.248/MGCP/SIP/H.323 and so on.

The QoS guarantee processing flow in the above-mentioned call process is as shown in Figure 2 (the figure only shows the situation that can be accepted), comprises the following steps:

F201, the access device AD1 in the network N3 calls the access device AD2 in the network 4, and the signaling is sent to the border gateway BG1, and the QoS parameters carried in the signaling are G.711/G.729/G.723;

F202, after receiving the signaling, the calling border gateway BG1 judges whether it can be accepted, if yes, execute step F206, if it cannot be accepted due to insufficient resources or other reasons, execute the next step;

F203, the calling border gateway BG1 forwards the signaling of the access device AD1 to the soft switch device SS1, and adds insufficient resources or other unacceptable reasons;

F204, after receiving the signaling, the softswitch SS1 initiates a call release signaling to the calling border gateway BG1 according to the reason;

F205, the calling border gateway BG1 releases related resources, and forwards the release signaling to the access device AD1, and ends the whole process;

F206, the calling border gateway BG1 reserves the largest G.711 resource (100Kbps) in QoS for this call (assuming that the available bandwidth of BG1 is sufficient), and forwards the signaling to the softswitch device SS1, and the QoS parameter carried is G .711/G.729/G.723;

F207, after the softswitch SS1 receives the signaling, judge whether to accept it, if it cannot be accepted due to QoS control strategy or other reasons, perform the next step, if it can be accepted, perform step F209;

F208, the softswitch SS1 rejects the call, initiates a call release signaling to the calling border gateway BG1, and proceeds to step F205;

F209, the softswitch SS1 determines the attributes of the calling and called border gateways and access devices and the network resource usage of the calling and called border gateways through signaling analysis, and determines the QoS parameters that can be used by the calling user according to the set policy as G.729/G.723, send signaling to the called border gateway BG2 and carry this parameter;

Assume that the current available bandwidth of BG1 is greater than 100Kbps, BG2 is only 50Kbps, and the access device AD2 can only support G.729 or G.723, so the determined QoS parameter is G.729/G.723. Here, the QoS selection strategy is: on the basis of currently having a corresponding amount of available resources, select the media and/or bandwidth supported by the calling party, the called access device, and the passing border gateway from the applied QoS parameters, such When there are multiple media and/or bandwidth, choose the larger one.

F210, after receiving the signaling, the called border gateway BG2 judges whether it can be accepted, if yes, execute step F212, if it cannot be accepted due to insufficient resources or other reasons, execute the next step;

F211, the called border gateway BG2 releases the resources occupied, and sends a call rejection message to the softswitch SS1, and proceeds to step F208;

F212, the called border gateway BG2 reserves the maximum resource requirement (50Kbps bandwidth resources for G.729) according to the QoS parameters in the signaling, and then sends the signaling to the called access device AD2, carrying the QoS parameters G.729 /G.723;

F213, the called access device AD2 judges whether to accept the call, if accepted, execute step F215, otherwise, execute the next step;

F214, the called access device AD2 rejects the call, sends a call release message to the border gateway BG2, and proceeds to step F211;

F215, the called access device AD2 selects according to the QoS parameters in the signaling, assuming that it agrees to use the G.723 media, and sends the signaling to the border gateway BG2, carrying the QoS parameter G.723;

F216. After receiving the signaling, the border gateway BG2 at the called end adjusts the reserved bandwidth to the actually used resource (the actual occupation is 30Kbps) according to the QoS related parameters in the signaling, and establishes a media forwarding channel and forwarding channel for the user of this call. Published, the content includes: source of media forwarding, destination IP address, media type, bandwidth used, etc. and forward the signaling to the softswitch SS1;

F217. After receiving the signaling, the softswitch SS1 sets the resource usage of the entire network. Here, the resource usage of the two border networks of this call is set to 30Kbps, and the signaling is forwarded to the calling border gateway BG1, carrying the QoS Parameter G.723;

F218. After receiving the signaling, the calling border gateway BG1 adjusts the reserved bandwidth to the actual resource (30Kbps), and establishes a media forwarding channel and forwarding table for the user of this call, including: source and destination IP addresses of media forwarding , media type and used bandwidth, etc., and forward the signaling to the calling access device AD1;

F219, the calling access device AD1 uses G.723 to transmit the media stream;

F220, after the call enters the connected state, the two access devices AD1 and AD2 perform two-way media interaction through two border gateways BG1 and BG2, and the border gateways BG1 and BG2 identify and identify the two-way media stream Whether the source and destination IP meet the requirements, and then deal with it according to the QoS policy, including:

Measurement and processing of media traffic, if the measured traffic exceeds the used bandwidth in the forwarding table, such as the measured value is 40Kbps, and the used bandwidth is 30Kbps, the border gateway BG1 or BG2 will process it according to a specific flow control strategy, such as the leaky bucket algorithm media streams exceeding the bandwidth;

If the measurement and processing of media delay, jitter and packet loss cannot meet the requirements of the softswitch equipment for the bearer network, it will report to the softswitch equipment, and the softswitch equipment will determine whether to tear down the call.

F221, when the call ends or the softswitch device interrupts the call, the border gateways BG1 and BG2 will forward the release signaling, and remove the established media forwarding channel and forwarding table, update the network resource usage, and the softswitch device SS1 will also update the entire network Resource usage.

After the above-mentioned QoS processing flow, it can ensure that the QoS requirements of the softswitch network can be guaranteed when the media of the networks N1 and N3 interact. If a user in the network N1 calls a user in the network N4, the processing on the called side is the same as the QoS processing of AD1 calling AD2 above, and there is no border gateway on the calling side, and no related processing is performed. If a user in network N3 or N4 calls a user in network N1, the QoS processing of the above flow is performed on the calling side, while the called side has no border gateway and does not perform related processing.

In addition, the transmission of the above-mentioned QoS parameters and other information between the terminal, the border gateway and the softswitch device is entrained in the original signaling message and does not affect the original signaling transmission process.

When the access gateway AG1 in the network N1 calls the access gateway AG2 in the network N2, the signaling flow in the originating direction is from AG1->SS1->BG3->SS2->AD2, the corresponding path shown in the figure It is S5, S6, S7, S8, and all signaling response messages are returned according to the original path. The media flow flows between AG1->BG3->AD2 or its reverse flow, and the paths shown in the figure are M4 and M5. Call signaling can use protocols such as SIP-T/H.323, and the types are not limited.

The QoS guarantee processing flow in the above-mentioned call process is as shown in Figure 3 (only shows the situation that can be accepted in the figure), comprises the following steps:

F301, the access gateway AG1 in the network N1 calls the access gateway AG2 in the network N2, and AG1 sends signaling to the softswitch device SS1, carrying QoS parameters, which are G.711/G.729/G.723;

F302. After receiving the signaling, the softswitch SS1 judges whether to accept it. If it cannot be accepted due to QoS control strategy or other reasons, perform the next step. If it can be accepted, perform step F304;

F303, the softswitch SS1 rejects the call, sends a rejection signaling to the access gateway AG1, AG1 releases resources, and the call process ends;

F304, the softswitch device determines the attributes of the calling access device and the network border gateway and the usage of network resources through signaling analysis, determines the QoS parameters available to the user according to the set policy, and then sends signaling to the border gateway BG3, Carry the QoS parameter; here, BG3 can only support G.729 and G.723, so the determined QoS attribute is G.729/G.723.

F305, after the border gateway BG3 receives the signaling, judge whether it can be accepted, if yes, execute step F307, if it cannot be accepted due to insufficient resources or other reasons, execute the next step;

F306, the border gateway BG3 sends a call rejection message to the softswitch SS1 in the network N1, and proceeds to step F303;

F307, the border gateway BG3 reserves the maximum resource requirement (assuming sufficient resources, 50Kbps bandwidth resources are reserved for G.729), and sends the signaling to the softswitch device SS2 in the network N2, carrying QoS parameters G.729/G.723 ;

F308. After receiving the signaling, the softswitch SS2 judges whether to accept it. If it cannot be accepted due to QoS control strategy or other reasons, perform the next step. If it can be accepted, perform step F310;

F309, the softswitch SS2 rejects the call, sends a rejection message to the border gateway BG3, and proceeds to step F306;

F310, the softswitch SS2 determines the attributes of the called access device AG2 and the border gateway BG3 and the usage of network resources through signaling analysis, determines the QoS parameters available to the user according to the set policy, and then reports to the called access gateway AG2 sends signaling, carrying the QoS parameter;

Assume that AG2 also supports G.729 and G.723, so the determined QoS attributes are still G.729 and G.723.

F311, the called access gateway AG2 judges whether to accept the call, if accepted, execute step 313, otherwise, execute the next step;

F312, the called access gateway AG2 rejects the call, sends a rejection message to the softswitch SS2, and proceeds to step F309;

F313, the called access device AD2 accepts the call, agrees to use the G.723 media, and sends the signaling message to the softswitch SS2, carrying the QoS parameter G.723;

F314. After receiving the signaling, the softswitch device SS2 in the network N2 sets the network resource occupancy of the called access device AG2 and the border gateway BG3 to 30Kbps, and forwards the signaling to the network border gateway BG3, carrying the QoS parameter G .723;

F315. After the network border gateway BG3 receives the signaling, it adjusts the reserved bandwidth to the actual resource used, namely 30Kbps, according to the QoS parameters in the signaling, and establishes a media forwarding channel and forwarding table for this call, including: the source of media forwarding , destination IP address, media type, and used bandwidth, etc., and then forward the signaling to the softswitch device SS1, carrying the QoS parameter G.723;

F316. After receiving the signaling, the softswitch device SS1 in the network N1 sets the network resource occupancy of the calling access device AG1 and the network border gateway BG3 to 30Kbps, and forwards the signaling to the network access gateway AG1 , carrying the QoS parameter G.723;

F317, the calling access device AG1 uses G.723 to transmit the media stream;

F318. After the call enters the connected state, the two access gateways AG1 and AG2 perform two-way media interaction through the network border gateway BG3. The border gateway BG3 identifies and identifies the two-way media stream, and processes it according to the QoS policy. The method is the same as step F220;

F319, when the call ends or the softswitch device interrupts the call, the network border gateway BG3 will forward the release signaling, and remove the established media forwarding channel and forwarding table, update the network resource usage, and the two softswitch devices SS1 and SS2 will also update The usage of network resources.

The cross-network communication between other access devices in the network N1 and N2 can be obtained simply according to the above process, which is not described in this article.

Although the above-mentioned embodiment has described in detail the implementation method related to the multimedia QoS based on the softswitch network, those skilled in the art will understand that, without departing from the scope and spirit of the present invention, it can be implemented in the form and various obvious modifications of details. It should be noted that the embodiments described above are illustrative rather than restrictive, and all changes and modifications are within the protection scope of the appended claims of the present invention without departing from the spirit and scope of the present invention. within.

Claims (9)

1. A method for ensuring communication quality of service in a softswitch network, comprising the following steps: (a) Setting border gateways at the borders of different networks, and configuring them so that when cross-domain calls are generated between networks, signaling and media streams are transmitted through the border gateways between networks; (b) Configure the quality of service control strategy of the network on the softswitch device, including the quality of service parameters of users and border gateways and the strategy of selecting the quality of service parameters that can be used by call users, and configure their own quality of service parameters on the border gateway ; (c) The calling access device initiates a cross-domain call. After receiving the signaling, the softswitch device selects the quality of service parameters that the user can use according to the quality of service parameters of the calling and called access devices and border gateways involved in the call. At that time, send the parameter to the next device along with the signaling, otherwise reject the call; After receiving the signaling, the border gateway judges whether the current available bandwidth can meet the requirements according to the quality of service parameters in the signaling, and if so, sends the quality of service parameters to the next device along with the signaling, otherwise rejects the call; (d) After receiving the signaling, the called access device decides to use the QoS parameter and sends it back to the calling access device through the border gateway and softswitch device through the signaling, and the border gateway establishes a media forwarding channel for the call , the calling and called access devices communicate according to the agreed service quality parameters. 2. The method according to claim 1, wherein the quality of service parameters of the user include at least supported media types and/or bandwidth, and the quality of service parameters of the border gateway include at least forwardable media types and/or bandwidth or total bandwidth. 3. The method according to claim 2, characterized in that, in the step (d), the border gateway also records the media stream identifier and the quality of service parameter used for this call, and after the call is connected, the two-way media stream Identify and mark, and measure the media flow, and limit the flow according to the set flow control strategy when the measured flow exceeds the requirements of the recorded service quality parameters. 4. The method according to claim 3, wherein the border gateway also measures the time delay, jitter and packet loss of the two-way media stream, and judges whether the requirements of the softswitch device for the bearer network are satisfied, if not, The softswitch will be reported to the softswitch, and the softswitch will determine whether to tear down the call. 5. The method according to claim 1 or 2, characterized in that: The resource distribution situation of the whole network is also configured in the softswitch device in the described step (b); In the described step (c), after selecting the service quality parameters that the user can adopt, the softswitch device also judges whether the border gateway that this call passes through currently has sufficient bandwidth resources according to the resource distribution situation, and if so, then selects the selected The parameter is sent with the signaling, otherwise the call is rejected; and In the step (d), the softswitch device also updates the resource usage of the whole network according to the finally adopted QoS parameter. 6. The method according to claim 1 or 2, characterized in that, after receiving the signaling in the step (c), the border gateway first reserves a bandwidth within the currently available bandwidth for it according to the quality of service parameter in the signaling The maximum required bandwidth resources, and in the step (d), the bandwidth is corrected according to the actually used QoS parameters. 7. The method according to claim 5, characterized in that, the strategy of the step (c) that the softswitch selects the quality of service parameters available to the calling user is: the border gateway currently has a corresponding amount of available resources On the basis, select the media and/or bandwidth supported by the calling and called access devices and the passing border gateways from the applied quality of service parameters. 8. The method according to claim 5, characterized in that when there are multiple media and/or bandwidths supported by the calling and called access devices and the border gateway they pass through, the one that requires a larger bandwidth is selected . 9. The method according to claim 1, characterized in that the transfer of the QoS parameter information between the access device, the border gateway and the soft switch device is included in an original standard signaling message.

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