CN100493082C - A Congestion Control Method for SIP Server - Google Patents
A Congestion Control Method for SIP ServerDownload PDFInfo
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Abstract
Translated fromChineseDescription
Translated fromChinese技术领域technical field
本发明涉及SIP服务器领域，特别是指一种SIP服务器的拥塞控制方法。The invention relates to the field of SIP servers, in particular to a congestion control method for a SIP server.
背景技术Background technique
随着通讯技术的发展，人们不再满足于单一的语音通信方式，而需要全新的多媒体通信方式，这种多媒体通信不仅仅包括简单的视频或音频通信，还包括即时消息、同址浏览、协同工作和流媒体等业务，以及新的通信方式和传统语音相融合的业务。基于因特网(Internet)和电信网络融合的趋势，下一代网络(Next Generation Network，NGN)最终目标是在IP承载网基础上的宽带多媒体业务网络，该网络采用初始会话协议(Session Initial Protocol，SIP)作为多媒体业务会话控制信令，通过因特网承载所有信令和媒体流，应用与接入无关的网络架构和技术。With the development of communication technology, people are no longer satisfied with a single way of voice communication, but need a new way of multimedia communication, this multimedia communication not only includes simple video or audio communication, but also includes instant messaging, same-site browsing, collaborative Services such as work and streaming media, as well as services that integrate new communication methods with traditional voice. Based on the trend of Internet (Internet) and telecommunications network integration, the ultimate goal of the next generation network (Next Generation Network, NGN) is a broadband multimedia service network based on the IP bearer network, which uses the initial session protocol (Session Initial Protocol, SIP) As a multimedia service session control signaling, all signaling and media streams are carried through the Internet, and access-independent network architecture and technologies are applied.
应用SIP的多媒体宽带网络由SIP用户代理和SIP服务器组成，SIP服务器包括SIP代理服务器、SIP重定向服务器和各种支持SIP的应用服务器等组成。SIP功能实体之间通过IP网络进行连接，通过SIP信令控制多媒体会话。The multimedia broadband network using SIP is composed of SIP user agent and SIP server. SIP server includes SIP proxy server, SIP redirection server and various application servers supporting SIP. SIP functional entities are connected through an IP network, and multimedia sessions are controlled through SIP signaling.
SIP网络中的SIP服务器自身有一定的处理能力限制，当网络中某个SIP服务器所处理的业务量超过其处理能力或达到其处理能力的一定比例时，正在进行的业务和正在发起的业务都可能失败，这种情况叫做拥塞。目前在SIP服务器发生拥塞时，将不能够接收其它SIP服务器或SIP用户代理发送的请求消息，或不能够对其进行及时处理。The SIP server in the SIP network itself has a certain processing capacity limitation. When the business volume processed by a certain SIP server in the network exceeds its processing capacity or reaches a certain proportion of its processing capacity, the ongoing business and the business being initiated are both May fail, this situation is called congestion. Currently, when a SIP server is congested, it cannot receive request messages sent by other SIP servers or SIP user agents, or cannot process them in time.
随着SIP用户数量的不断增加，SIP业务的多样化和业务量的上升，SIP网络规模日益扩大，发生拥塞的可能也越来越大，尤其是在某些热门时段，某些SIP服务器的用户业务量会突然大量上升导致SIP服务器发生拥塞。由于SIP服务器发生拥塞后，不能够对向其发送的请求消息进行及时处理，造成了SIP业务的成功率很低，使其竞争力下降，同时也给SIP网络的发展带来了巨大的影响。With the continuous increase in the number of SIP users, the diversification of SIP services and the increase in business volume, the scale of SIP network is expanding day by day, and the possibility of congestion is also increasing, especially in some hot hours, users of some SIP servers A sudden increase in business volume will lead to congestion of the SIP server. After the SIP server is congested, it cannot process the request message sent to it in time, resulting in a very low success rate of the SIP service, which reduces its competitiveness, and also has a huge impact on the development of the SIP network.
发明内容Contents of the invention
有鉴于此，本发明的目的在于提供一种SIP服务器的拥塞控制方法，该方法能够对SIP服务器进行拥塞控制，进而能够提高SIP业务的成功率。In view of this, the object of the present invention is to provide a congestion control method for a SIP server, which can control the congestion of the SIP server, thereby improving the success rate of the SIP service.
为了达到上述目的，本发明提供了一种SIP服务器的拥塞控制方法，该方法包括以下步骤：In order to achieve the above object, the invention provides a kind of congestion control method of SIP server, and this method comprises the following steps:
A、SIP服务器对其当前处理的业务量进行检测；A. The SIP server detects its current processing traffic;
B、当SIP服务器检测到当前处理的业务量达到预先设定的拥塞门限时，该设定的拥塞门限为SIP服务器设定的占其自身最大处理能力的一定比例的业务量，对于其接收的请求消息返回拥塞响应消息。B. When the SIP server detects that the current processing traffic reaches the preset congestion threshold, the preset congestion threshold is a certain percentage of the traffic set by the SIP server that accounts for its own maximum processing capacity. The request message returns a congestion response message.
较佳地，在所述步骤B中，对于其接收的请求消息返回拥塞响应消息之前，进一步包括：Preferably, in the step B, before returning the congestion response message to the received request message, it further includes:
SIP服务器判断其接收的消息是否是正在进行中的SIP业务的请求消息，如果是正在进行中的SIP业务的请求消息，对于该消息按正常进行处理；否则，执行所述的对于其接收的请求消息返回拥塞响应消息。The SIP server judges whether the message it receives is the request message of the SIP service in progress, if it is the request message of the SIP service in progress, the message is processed normally; otherwise, the request for its reception is executed message returns a congestion response message.
较佳地，所述步骤B中，拥塞门限包括第一拥塞门限和第二拥塞门限，其中，第一拥塞门限小于第二拥塞门限，则所述步骤B为：Preferably, in the step B, the congestion threshold includes a first congestion threshold and a second congestion threshold, wherein the first congestion threshold is smaller than the second congestion threshold, then the step B is:
当SIP服务器检测到当前处理的业务量达到第一拥塞门限时，判断其接收的消息是否是用户的SIP登记请求或不需要登记用户的用户业务请求，如果是，则对于该消息返回拥塞响应消息；否则，对于该消息按正常进行处理；When the SIP server detects that the current processing traffic reaches the first congestion threshold, it judges whether the message it receives is a user's SIP registration request or a user's service request that does not need to be registered, and if so, returns a congestion response message to the message ;Otherwise, process the message normally;
当SIP服务器监测到当前处理的业务达到第二拥塞门限时，判断其接收的消息是否是正在进行中的SIP业务的请求消息，如果是，对于该消息按正常进行处理；否则，对于该消息返回拥塞响应消息。When the SIP server monitors that the currently processed business reaches the second congestion threshold, it judges whether the message it receives is a request message of an ongoing SIP service, and if so, the message is processed normally; otherwise, the message is returned Congestion response message.
较佳地，所述步骤B后进一步包括：Preferably, after the step B, further include:
接收拥塞响应消息的SIP请求方判断该消息中是否包含替代SIP服务器地址参数，如果包含该参数，再次向该参数中的SIP服务器地址发送请求消息；否则，结束本方法。The SIP requestor receiving the congestion response message judges whether the message contains an alternative SIP server address parameter, and if it contains the parameter, sends a request message to the SIP server address in the parameter again; otherwise, ends the method.
较佳地，所述的替代SIP服务器地址参数的生成步骤为：Preferably, the generation steps of the described substitute SIP server address parameter are:
SIP服务器根据自己预先配置的一个或多个替代SIP服务器地址，设定拥塞响应消息中的替代SIP服务器地址参数。The SIP server sets the address parameter of the alternate SIP server in the congestion response message according to one or more alternate SIP server addresses pre-configured by itself.
较佳地，在所述的如果没有包含替代SIP服务器地址参数后，结束本方法前，进一步包括：Preferably, before ending the method if the alternative SIP server address parameter is not included, it further includes:
SIP请求方判断其自身是否能够得到替代SIP服务器地址，如果能够得到替代SIP服务器地址，则再次向该SIP服务器地址发送请求消息；否则结束本方法。The SIP requester judges whether it can obtain an alternative SIP server address, and if it can obtain an alternative SIP server address, it sends a request message to the SIP server address again; otherwise, the method ends.
较佳地，所述步骤B后进一步包括：Preferably, after the step B, further include:
接收拥塞响应消息的SIP请求方判断该消息中是否包含时延参数，如果包含时延参数，SIP请求方在经过拥塞响应消息中的时延参数中的时间后，重新向原SIP服务器发送请求消息；否则，结束本方法。The SIP requestor who receives the congestion response message judges whether the delay parameter is included in the message, and if the delay parameter is included, the SIP requestor resends the request message to the original SIP server after passing through the time in the delay parameter in the congestion response message; Otherwise, end this method.
从以上技术方案可以看出，本发明中，在SIP服务器中增加了拥塞控制机制，即在发生拥塞时，对于其接收的请求消息返回拥塞响应消息，SIP请求方根据拥塞响应消息进行相应的处理，从而提高了SIP业务的成功率，增强了SIP业务的竞争力，加快了SIP网络的发展。As can be seen from the above technical solutions, in the present invention, a congestion control mechanism is added in the SIP server, that is, when congestion occurs, the request message received by it returns a congestion response message, and the SIP requester performs corresponding processing according to the congestion response message , thereby improving the success rate of the SIP business, enhancing the competitiveness of the SIP business, and accelerating the development of the SIP network.
附图说明Description of drawings
图1为本发明拥塞控制方法第一实施例的流程图；FIG. 1 is a flow chart of the first embodiment of the congestion control method of the present invention;
图2为本发明拥塞控制方法第二实施例的流程图。FIG. 2 is a flow chart of the second embodiment of the congestion control method of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面结合附图对本发明作进一步的详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
本发明的主要思想是：SIP服务器对其当前处理的业务量进行检测；当SIP服务器检测到当前处理的业务量达到预先设定的拥塞门限时，对于其接收的请求消息返回拥塞响应消息。The main idea of the present invention is: the SIP server detects the current processing traffic; when the SIP server detects that the current processing traffic reaches the preset congestion threshold, it returns a congestion response message to the received request message.
以下对本发明拥塞控制方法的第一实施例进行说明。The first embodiment of the congestion control method of the present invention will be described below.
在本实施例中，首先设定SIP请求消息的优先级。由于拒绝正在进行中的业务的请求对用户业务造成的影响最大，所以将其优先级设定为高优先级。正在进行中的业务包括NOTIFY、BYE等，本实施例中将这类优先级最高的业务称为A类消息。除去上述这类消息之外的消息包括已登记用户的业务请求消息，用户的登记请求消息和不需要登记的用户的业务请求消息等，已登记用户的请求消息包括INVITE、MESSAGE等，用户的登记请求消息包括REGISTER等，不需要登记的用户的业务请求消息包括INVETE、MESSAGE等，将上述这些请求消息的优先级设定为低优先级，本实施例中，将这类请求消息称为B类消息。当服务器发生拥塞时，SIP服务器对于B类消息返回拥塞响应消息，对于A类消息按正常进行处理。In this embodiment, the priority of the SIP request message is set first. Since the request to reject the ongoing service has the greatest impact on the user's service, its priority is set to a high priority. The ongoing services include NOTIFY, BYE, etc. In this embodiment, such services with the highest priority are referred to as type A messages. Messages other than the above-mentioned messages include service request messages of registered users, registration request messages of users and service request messages of users who do not need to register, etc., request messages of registered users include INVITE, MESSAGE, etc., and user registration request messages The request message includes REGISTER, etc., and the service request message of users who do not need to register includes INVETE, MESSAGE, etc., and the priority of these request messages is set to low priority. In this embodiment, this type of request message is called type B information. When the server is congested, the SIP server returns a congestion response message to the B-type messages, and processes the A-type messages as normal.
拥塞响应消息是本实施例中在SIP消息中新增加的消息，该消息属于服务器端错误类消息，用于SIP服务器和SIP用户代理之间或者SIP服务器和SIP服务器之间。拥塞响应消息中可以包括替代SIP服务器地址参数、时延参数等，替代SIP服务器地址用于被拒绝的SIP用户代理或SIP服务器依据其向替代SIP服务器重新发送请求消息，时延参数用于被拒绝的SIP用户代理或SIP服务器依据其在一定的延时后，重新向原SIP服务器发送请求消息。The congestion response message is a newly added message in the SIP message in this embodiment. This message belongs to the server-side error message and is used between the SIP server and the SIP user agent or between the SIP server and the SIP server. The congestion response message may include an alternative SIP server address parameter, a delay parameter, etc. The alternative SIP server address is used for the rejected SIP user agent or SIP server to resend the request message to the alternative SIP server based on it, and the delay parameter is used for the rejected The SIP user agent or SIP server resends the request message to the original SIP server after a certain delay according to it.
本实施例中，SIP服务器是否发生拥塞是通过检测SIP服务器处理的业务量进行判断的，当SIP服务器处理的业务量达到了与其自身最大处理能力的比例为一定值P时，则设定为发生拥塞，此时的业务量即为拥塞门限。比例值P可以由运营商或设备提供商预先设定，或者根据SIP服务器的重要程度不同可设置不同的P值。例如，对于重要的SIP服务器可以将发生拥塞的比例值P设定为70％，其次重要的设定为80％，一般的SIP服务器设定为90％。In this embodiment, whether the SIP server is congested is judged by detecting the traffic handled by the SIP server. When the traffic handled by the SIP server reaches a certain value P when the ratio of the SIP server's maximum processing capacity is a certain value, then it is set to occur. Congestion, the traffic volume at this time is the congestion threshold. The proportional value P can be preset by the operator or the equipment provider, or different P values can be set according to the importance of the SIP server. For example, the congestion ratio P can be set to 70% for an important SIP server, 80% for a second important SIP server, and 90% for a general SIP server.
在进行了上述设定后，本发明SIP服务器的拥塞控制方法的流程如图1所示，具体步骤如下：After carrying out above-mentioned setting, the flow process of the congestion control method of SIP server of the present invention is as shown in Figure 1, and concrete steps are as follows:
步骤101、SIP服务器对其处理的业务量进行检测，并判断其是否达到了拥塞门限，如果达到了拥塞门限，执行步骤102；否则执行步骤109。
步骤102、SIP服务器判断其接收的请求消息是否是B类消息，如果是B类消息，执行步骤103；否则执行步骤109。
步骤103、SIP服务器对于该消息，生成拥塞响应消息，并向该消息的请求方发送拥塞响应消息，然后执行步骤104。
本步骤中，生成的拥塞响应消息中包括有替代SIP服务器地址参数和/或时延参数。SIP服务器中预先配置有替代SIP服务器地址，拥塞响应消息中的替代SIP服务器地址参数值，由SIP服务器根据其自身中配置的替代SIP服务器地址生成。时延参数由SIP服务器根据拥塞严重程度来确定，其值可以为5秒或10秒或其他值。In this step, the generated congestion response message includes a substitute SIP server address parameter and/or delay parameter. The SIP server is pre-configured with a substitute SIP server address, and the parameter value of the substitute SIP server address in the congestion response message is generated by the SIP server according to the substitute SIP server address configured in itself. The delay parameter is determined by the SIP server according to the congestion severity, and its value may be 5 seconds or 10 seconds or other values.
步骤104、该消息的SIP请求方接收该拥塞响应消息，并判断该消息中是否包含替代SIP服务器地址，如果包含替代SIP服务器地址，执行步骤105；否则执行步骤106。
步骤105、SIP请求方向替代SIP服务器发送上述请求消息，然后结束本流程。
步骤106、SIP请求方判断其自身是否能够得到替代服务器的地址，如果能够得到替代服务器的地址，返回执行步骤105；否则执行步骤107。
步骤107、SIP请求方判断接收的拥塞响应消息中是否包含时延参数，如果包含时延参数，执行步骤108；否则结束本流程。In
步骤108、SIP请求方在经过该时延参数中的时间后，重新向返回拥塞响应消息的SIP服务器发送原请求消息，然后结束本流程。Step 108: After the time in the delay parameter has elapsed, the SIP requester resends the original request message to the SIP server that returned the congestion response message, and then ends the process.
步骤109、对请求消息按正常进行处理，然后结束本流程。
以上为对本发明第一实施例的说明。The above is the description of the first embodiment of the present invention.
在本发明的第二实施例中，将SIP服务器的拥塞级别设定为两级，包括轻度拥塞和严重拥塞，相应的将请求消息的优先级设定为三级，以下对其进行具体说明。In the second embodiment of the present invention, the congestion level of the SIP server is set to two levels, including mild congestion and severe congestion, and the priority of the request message is set to three levels accordingly, which will be described in detail below .
本实施例中，首先设定SIP请求消息的优先级。由于正在进行中的业务如果拒绝其请求对用户业务造成的影响最大，将这类请求消息的优先级设定为最高，正在进行中的业务的请求消息包括NOTIFY、BYE等，本实施例中将这类消息称为A类消息；对用户业务影响稍小于A类消息的是已登记用户的业务请求，已登记用户的请求消息包括INVITE、MESSAGE等，这类请求消息的优先级低于A类消息，本实施例中将这类消息称为B类消息；优先级最低的是已登记用户的登陆请求，如REGISTER等，和不需要用户登记的SIP网络中的用户业务请求，如INVITE、MESSAGE等，本实施例中将这类消息称为C类消息。当SIP服务器发生轻度拥塞时，首先拒绝C类消息，当拥塞继续严重，发生严重拥塞时，拒绝B类消息。In this embodiment, firstly, the priority of the SIP request message is set. Since the ongoing service will have the greatest impact on user services if its request is rejected, the priority of this type of request message is set to the highest. The ongoing service request message includes NOTIFY, BYE, etc. In this embodiment, the This type of message is called a type A message; the service request of a registered user that has a slightly less impact on the user's business than the type A message, the registered user's request message includes INVITE, MESSAGE, etc., and the priority of this type of request message is lower than that of the type A message Message, in the present embodiment, this type of message is referred to as B class message; The lowest priority is the login request of the registered user, such as REGISTER, etc., and the user service request in the SIP network that does not need user registration, such as INVITE, MESSAGE etc. In this embodiment, this type of message is referred to as a type C message. When the SIP server is slightly congested, class C messages are first rejected, and when the congestion continues to be serious and severe congestion occurs, class B messages are rejected.
此外，在SIP消息中增加拥塞响应消息，拥塞响应消息属于服务端错误消息，该消息用于SIP用户代理和SIP服务器之间，以及SIP服务器之间，当发生拥塞的服务器收到SIP用户代理或SIP服务器的某些需要拒绝的SIP请求消息时，返回拥塞响应消息。拥塞响应消息中可以包括替代SIP服务器地址参数和时延参数等，替代SIP服务器地址参数用于被拒绝的SIP用户代理或SIP服务器，向能够替代拒绝其请求的SIP服务器的其他SIP服务器发送请求消息；时延参数用于被拒绝的SIP用户代理或SIP服务器，在无法向其他SIP服务器进行业务请求的情况下，经过该时延参数中的时间后重新向原拒绝其请求的SIP服务器发送请求消息。In addition, a congestion response message is added to the SIP message. The congestion response message belongs to the server error message. This message is used between the SIP user agent and the SIP server, and between the SIP servers. When some SIP request messages need to be rejected by the SIP server, it returns a congestion response message. The congestion response message may include alternative SIP server address parameters and delay parameters, etc. The alternative SIP server address parameters are used for rejected SIP user agents or SIP servers, and send request messages to other SIP servers that can replace the rejected SIP server ; The delay parameter is used for the rejected SIP user agent or SIP server. When the service request cannot be made to other SIP servers, after the time in the delay parameter passes, the request message is resent to the SIP server that originally rejected the request.
本实施例中，将SIP服务器的拥塞级别划分为轻度拥塞和严重拥塞，SIP服务器是否发生拥塞是通过检测SIP服务器处理的业务量进行判断的，当SIP服务器处理的业务量达到了占用其自身最大处理能力的比例P时，则设定为发生轻度拥塞，此时的业务量即为轻度拥塞门限；当SIP服务器处理的业务量达到了占用其自身最大处理能力的比例P`时，则设定为发生严重拥塞，此时的业务量即为严重拥塞门限。本实施例中设定P为70％，P`为80％，当然，两个比例值的设定也可以设定为其他的值，例如80％和90％等。In this embodiment, the congestion level of the SIP server is divided into mild congestion and serious congestion. Whether the SIP server is congested is judged by detecting the traffic handled by the SIP server. When the proportion P of the maximum processing capacity, it is set as mild congestion, and the traffic volume at this time is the mild congestion threshold; when the business volume processed by the SIP server reaches the proportion P` of its own maximum processing capacity, Then it is set that severe congestion occurs, and the traffic volume at this time is the severe congestion threshold. In this embodiment, P is set to 70%, and P' is set to 80%. Of course, the setting of the two ratios can also be set to other values, such as 80% and 90%.
在进行了上述设定后，本发明SIP服务器的拥塞控制方法的流程如图1所示，具体步骤如下：After carrying out above-mentioned setting, the flow process of the congestion control method of SIP server of the present invention is as shown in Figure 1, and concrete steps are as follows:
步骤201、SIP服务器判断其处理的业务量是否达到严重拥塞门限，如果达到严重拥塞门限，执行步骤202；否则，执行步骤203。Step 201 , the SIP server judges whether the traffic it processes reaches the severe congestion threshold, and if it reaches the severe congestion threshold, executes step 202 ; otherwise, executes step 203 .
步骤202、SIP服务器判断其接收SIP请求方的消息是否是A类消息，如果是A类消息，执行步骤205；否则执行步骤206。Step 202 , the SIP server judges whether the message received from the SIP requester is a type A message, and if it is a type A message, execute step 205 ; otherwise, execute step 206 .
步骤203、SIP服务器判断其处理的业务量是否达到轻度拥塞门限，如果达到轻度拥塞门限，执行步骤204；否则，执行步骤205。Step 203 , the SIP server judges whether the traffic handled by it reaches the mild congestion threshold, and if it reaches the mild congestion threshold, executes step 204 ; otherwise, executes step 205 .
步骤204、判断SIP服务器接收SIP请求方的消息是否是C类消息，如果是C类消息，执行步骤206；否则执行步骤205。Step 204 , judging whether the message received by the SIP server from the SIP requester is a Class C message, and if it is a Class C message, execute Step 206 ; otherwise, execute Step 205 .
步骤205、按正常处理请求消息，然后结束本流程。Step 205, process the request message normally, and then end this process.
步骤206、SIP服务器生成拥塞响应消息，并向SIP请求方返回该拥塞响应消息，然后执行步骤207。Step 206, the SIP server generates a congestion response message, and returns the congestion response message to the SIP requester, and then executes step 207.
本步骤中，生成的拥塞响应消息中包括有替代SIP服务器地址参数和/或时延参数。SIP服务器中预先配置有替代SIP服务器地址，拥塞响应消息中的替代SIP服务器地址参数值，由SIP服务器根据其自身中配置的替代SIP服务器地址生成。时延参数由SIP服务器根据拥塞严重程度来确定，其值可以为5秒或10秒或其他值。In this step, the generated congestion response message includes a substitute SIP server address parameter and/or delay parameter. The SIP server is pre-configured with a substitute SIP server address, and the parameter value of the substitute SIP server address in the congestion response message is generated by the SIP server according to the substitute SIP server address configured in itself. The delay parameter is determined by the SIP server according to the congestion severity, and its value may be 5 seconds or 10 seconds or other values.
步骤207、SIP请求方接收拥塞响应消息后，判断该消息中是否包含替代SIP服务器地址参数，如果包含替代SIP服务器地址参数，，执行步骤211；否则执行步骤208。Step 207: After receiving the congestion response message, the SIP requester judges whether the message contains a substitute SIP server address parameter, and if it contains a substitute SIP server address parameter, execute step 211; otherwise, execute step 208.
步骤208、SIP请求方判断其自身是否能够得到替代服务器的地址，如果能够得到替代服务器的地址，执行步骤211；否则执行步骤209。Step 208 , the SIP requester judges whether it can obtain the address of the substitute server, if it can obtain the address of the substitute server, execute step 211 ; otherwise, execute step 209 .
步骤209、SIP请求方判断接收的拥塞响应消息中是否包含时延参数，如果包含时延参数，执行步骤210；否则结束本流程。In step 209, the SIP requester determines whether the received congestion response message contains a delay parameter, and if it contains a delay parameter, executes step 210; otherwise, ends the process.
步骤210、SIP请求方在经过该时延参数中的延时后，重新向返回拥塞响应的SIP服务器发送原请求消息，然后结束本流程。Step 210, after the delay in the delay parameter, the SIP requester resends the original request message to the SIP server that returns the congestion response, and then ends the process.
步骤211、SIP请求方向替代服务器发送SIP请求，然后结束本流程。In step 211, the SIP requester sends the SIP request to the substitute server, and then ends the process.
以上为对本发明第二实施例的说明。The above is the description of the second embodiment of the present invention.
在具体的实施过程中可对根据本发明的方法进行适当的改进，以适应具体情况的具体需要。因此可以理解，根据本发明的具体实施方式只是起示范作用，并不用以限制本发明的保护范围。Appropriate improvements can be made to the method according to the present invention in the specific implementation process to meet the specific needs of specific situations. Therefore, it can be understood that the specific implementation manners according to the present invention are only exemplary, and are not intended to limit the protection scope of the present invention.
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| JP4940163B2 (en)* | 2008-02-05 | 2012-05-30 | 株式会社日立製作所 | Communication gateway device and relay method |
| US8583735B2 (en)* | 2010-11-17 | 2013-11-12 | International Business Machines Corporation | Delivery in session initiated protocol (SIP) conferencing |
| CN102244809B (en)* | 2011-06-22 | 2017-08-11 | 南京中兴软件有限责任公司 | A kind of processing method and processing device of set top box STB service requests |
| CN102263691B (en)* | 2011-07-04 | 2017-08-08 | 南京中兴软件有限责任公司 | A kind of method, system and device for realizing congestion control |
| CN103036885B (en)* | 2012-12-18 | 2016-03-23 | 迈普通信技术股份有限公司 | Sip server overload protective device and method |
| CN106713373A (en)* | 2015-07-13 | 2017-05-24 | 中兴通讯股份有限公司 | File sending method and apparatus |
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