Explore how Softswitch technology can implement node-based voice long distance control

With the advent of the Internet era, openness in the Next Generation Network has been unanimously recognized. Here we will mainly introduce how Softswitch technology can implement node-based voice control over long distances. As a commercial hardware platform based on open, standard, multi-protocol, and operational management technology representative, soft switches will become the next generation communication network (NGN) is one of the most important and critical systems and equipment technologies.

In recent years, IP technology has become increasingly mature due to rapid development. In specific applications, the application of end-to-end fusion of voice, data, and video through grouping networks has shown a strong competitiveness in the future market, as a result, the separated voice, data, and video networks will gradually evolve into an open next-generation communication network (NGN) integrating multiple services and IP addresses ). Professor Song Junde of Beijing University of Posts and Telecommunications said: "China is a big country in mobile Internet and mobile communication, and the Internet is growing rapidly. The final network must be everywhere in the world, including wireless, mobile, and fixed network."

In the next-generation network, openness is a recognized advantage. This openness is reflected in two aspects. First, the business can be expanded, access control, media transmission control, call processing, smart services, application services, and business operations in traditional operation networks are vertically integrated on the same platform. In this way, the operation business can be flexibly expanded.

In addition, business exchange can meet application requirements, and any business can implement new services by adding modules. In this way, personalized services for different users can be generated. This is a concern of carriers. The characteristics of softswitch can meet this requirement, so the Softswitch technology has a lot of room for development.

Fuzzy Concept

Although Softswitch has always been a hot topic in the discussion of NGN, its concept is still somewhat plausible. Should it be a device? Is it a system? Or technical architecture? In the fuzzy definition of NGN, some people think that Softswitch is NGN, while others think that the traditional PSTN voice service supported by Softswitch is the whole of NGN.

Yin Kang, chief technical consultant of Cisco Systems Asia Pacific NGN/VoIP, believes that the vague concept of softswitch reflects the industry's misunderstanding of softswitch in some aspects, there is a situation where the capability of one aspect is too emphasized or the softswitch function is exaggerated. It can be said that for a long time, the softswitch was artificially "mythical. According to the definition of isc in the international Softswitch Forum, Softswitch is a device and system that uses program-controlled software to provide call control functions based on the sub-network.

In a broad sense, Softswitch technology refers to the next generation network with Softswitch devices as the control core. In a narrow sense, Softswitch refers to the softswitch equipment located on the NGN control plane. It separates the call control function from the Media Gateway (Transport Layer) and implements basic call control functions through software on the server, including call routing, management control, Connection Control, and communication. More importantly, Softswitch uses open application interfaces (APIS) to allow flexible introduction of new services in the exchange mechanism.

Node control voice long distance

The concept of softswitch was quickly recognized and valued by the industry. Softswitch can implement cross-domain control and provide voice, data, and video services, and other integrated control and management of various access-level devices. In these applications, there are two types of applications that are very compatible with Softswitch and provide the positioning of traditional voice services based on group switching. They are: Application of softswitch in the speech long-distance network and Application of softswitch in the intelligent transformation of the fixed network.

The advantages of Softswitch technology can be best reflected in the application of speech long distance network. First, a larger system capacity makes the network structure simpler. Second, the call processing capability of the softswitch device is higher than that of the traditional switch. Therefore, when deploying a voice long-distance network, you can set fewer switching nodes. As the softswitch network is based on group switching and achieves control and load separation, resource redeployment is simpler and more efficient than circuit switching.

In addition, the Softswitch technology is applied to the voice long-distance network to avoid security attacks and user resource control. The long-distance network does not involve man or access networks, and the bandwidth of the backbone IP transmission network is relatively easy to guarantee, therefore, QoS Assurance does not exist. It is precisely because of the above reasons that Softswitch has been widely used in the transformation and expansion of the PSTN speech long-distance network. As a commercial hardware platform based on open, standard, multi-protocol, and operational management technology representative, soft switches will become the next generation communication network (NGN) is one of the most important and critical systems and equipment technologies.

In recent years, IP technology has become increasingly mature due to rapid development. In specific applications, the application of end-to-end fusion of voice, data, and video through grouping networks has shown a strong competitiveness in the future market, as a result, the separated voice, data, and video networks will gradually evolve into an open next-generation communication network (NGN) integrating multiple services and IP addresses ). Professor Song Junde of Beijing University of Posts and Telecommunications said: "China is a big country in mobile Internet and mobile communication, and the Internet is growing rapidly. The final network must be everywhere in the world, including wireless, mobile, and fixed network."

In the next-generation network, openness is a recognized advantage. This openness is reflected in two aspects. First, the business can be expanded, access control, media transmission control, call processing, smart services, application services, and business operations in traditional operation networks are vertically integrated on the same platform. In this way, the operation business can be flexibly expanded.

In addition, business exchange can meet application requirements, and any business can implement new services by adding modules. In this way, personalized services for different users can be generated. This is a concern of carriers. The characteristics of softswitch can meet this requirement, so the Softswitch technology has a lot of room for development.