How to wake up VOIP with softswitch technology
In recent years, IP technology has become increasingly mature due to the rapid development. In specific applications, the application of end-to-end fusion of voice, data, and video through packet networks has shown strong competitiveness in the future market, and it has followed, Separate voice, data, and video networks will gradually converge and evolve into an integrated next-generation communication network (NGN) that integrates multiple services, packet IP, and openness. Professor Song Junde of Beijing University of Posts and Telecommunications said: "China is a big country with mobile Internet and mobile communications. The Internet is also developing rapidly. The final network must be ubiquitous throughout the world, including wireless, mobile and fixed networks."
As a technical representative based on commercial hardware platform, adopting open, standard, multi-protocol and operational management, softswitch technology will become one of the important and key system and equipment technologies in the next generation communication network (NGN).
Softswitch technology and its application: http: //TIcle/84/2006/20060311524.html
On the next-generation network, openness is the unanimously recognized advantage. This openness is reflected in two aspects. One is the expansion of services, such as access control, media transmission control, call processing, and intelligent services in traditional operating networks. , Application services and business operations will be vertically integrated on the same platform. In this way, operations can be flexibly expanded. In addition, the exchangeability of services can meet application requirements, and any business can realize new services by adding modules. This can produce personalized services for different users. This is the concern of operators. The characteristics of softswitch can meet this demand, so the softswitch technology has a lot of room for development.
Fuzzy concept
Although softswitching has always been a hot topic in NGN discussions, its concept is still somewhat plausible. Should it be a device? A system? Or a technical architecture? Under the vague definition of NGN, some people think that softswitch is NGN, and some people think that the traditional PSTN voice services supported by softswitch are all the current NGN.
Yin Kang, chief technical consultant of NGN / VoIP in the Asia Pacific region of Cisco Systems, believes that the vagueness of the concept of softswitch technology reflects the fact that the industry still has some deviations in the understanding of softswitch in certain aspects, and the ability to overemphasize certain aspects, or It is an exaggeration of the situation of the softswitch function. It can even be said that for a long time, softswitch has been artificially "myth". According to the definition of the International Softswitch Forum ISC, Softswitch is a device and system that provides program control software based on packet networks using program control software.
Broadly speaking, soft switching refers to the next generation network with soft switching equipment as the control core; in a narrow sense, soft switching refers to the soft switching equipment located in 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 signaling interworking. More importantly, Softswitch uses an open application program interface (API), allowing flexible introduction of new services in the exchange mechanism.
Node controlled voice long distance
Once the concept of softswitch was proposed, it quickly gained wide recognition and attention in the industry. Softswitch can realize cross-domain control, can provide voice, data, and video services, as well as control and management of rich and diverse devices at the access level. . Among these applications, there are two types of applications that are very in line with the positioning of traditional voice services provided by softswitch based on packet switching. They are: the application of softswitch in voice long-distance network and the application of softswitch in intelligent transformation of fixed network. In the application of voice long-distance network, it can best reflect the technical advantages of softswitch. First, the larger system capacity makes the network structure simpler. Secondly, the call processing capacity of soft switching equipment is greater than that of traditional switches, so when deploying long-distance voice networks, fewer switching nodes can be set up.
Because the softswitch network is based on packet switching and realizes the separation of control and bearer, it is simpler and more efficient to reallocate resources than circuit switching. In addition, softswitch is applied to the voice long-distance network, which avoids security attacks and user resource control. The long-distance network does not involve the metropolitan area network or the access network, and the bandwidth of the backbone IP transmission network is relatively easy to guarantee, so there is no QoS. The guarantee problem is based on the above reasons. Softswitch has been widely used in the transformation and expansion of PSTN voice long-distance network.
How the network is smarter
The use of soft switches in the process of intelligent network transformation is also a direction for the application of soft switching technology. Using soft switches to replace traditional gateway switches can bring lower maintenance costs to the network. In addition, because of the large capacity and easy expansion of the softswitch network, under the premise of the continuous expansion of the local network and the premise of sufficient bearing resources, only more access gateways (AG) or trunk gateways (TG) need to be placed at the end office level , Adding the processing board accordingly in the soft switch equipment has no impact on the network architecture.
On the other hand, Softswitch's support for intelligent networks also makes it adequate for this role. Support for Intelligent Network Application Protocol (INAP) has become an indispensable capability of softswitch technology. No matter whether IP is used to carry INAP or through signaling gateway (SG) for signaling transfer, softswitch can It is easy to realize the connection with the traditional intelligent network equipment, and at the same time, the soft switch itself can also have the function of a service switching point (SSP). When the softswitch is applied to the network intelligent transformation, it may need to support an external user subscription attribute centralized database, because the use of an external subscription attribute database is the mainstream way to realize network intelligent service triggering.
Softswitch technology, as an integral part of call processing, identifies the most likely egress gateway to be used to terminate the call, and uses this information to command the relay gateway to perform the specified function. That is, softswitch technology can select a The least cost routing is used to complete each call, so that the selected egress gateway is closest to the destination phone. The emergence of softswitch has also brought considerable advantages to operators. The penetration and crossover of services are realized at the service level, making it possible to carry multiple services based on a unified packet network. And through a converged network to provide users with voice, data and multimedia services.
At the 2006 China Information Industry Economics Annual Conference, Zhao Huiling, vice president of China Telecom Group Beijing Research Institute, pointed out: "It is a long-term future for us to achieve a converged business providing platform, an integrated business management platform, and a portal to differentiate customer groups. Goal, and then stop circuit switching in the entire switching network, and gradually develop soft switching. "Soft switches, as a technical representative based on commercial hardware platforms, adopting open, standard, multi-protocol and operational management, will become important and critical in NGN One of system and equipment technology.
Softswitch technology "wake up" VoIP
VoIP integrates voice and data in one network, which means that only one network needs to be built and maintained to provide services previously supported by multiple networks, and the cost of construction and operation and maintenance is reduced. VoIP has the capabilities of voice compression and statistical multiplexing of bandwidth. Compared with the traditional network, the bandwidth utilization rate is higher and the transmission cost is saved. However, there are still many unresolved IP bearer network quality, and the quality of VoIP cannot be guaranteed. Security issues cannot be ignored either. This situation is similar to QoS, and private networks are the most thorough solution. If you build a private network for VoIP. Instead of decreasing, the network has increased. In addition, VoIP has much higher requirements for operation and maintenance personnel than traditional switches. This actually increases the operation and maintenance costs of VoIP. Therefore, VoIP needs a unified platform to improve and develop. Softswitch technology is fundamentally different from VoIP in concept. VoIP can only be regarded as one of the services provided by softswitch. Softswitch technology should be a comprehensive business platform, in addition to voice, it also supports video, instant messaging, games and various data services. In NGN, through a softswitch-based media gateway and media gateway controller, direct voice communication between the traditional voice network and the packet-switched network will be realized.
In addition, in various types of network environments, there will be some logically separated network elements, such as media gateways, signal processing gateways, media gateway controllers, and application servers, which use switch internal protocols such as media gateway control and gateway control. Protocol and initial session protocol to communicate. Circuit switching is a physical link corresponding to a connection, while soft switching is a physical link corresponding to multiple virtual connections. The softswitch control function is separated from the switch function, the software implements the control function and network function layering, and each network entity connects and communicates through standard protocols. Traditional circuit switching concentrates control and switching functions on the MSC, while soft switching only concentrates control functions on the MSC-Server, and the switching functions are distributed in the media gateway MGW. Traditional circuit switching is based on TDM switching technology, while soft switching is based on IP packet network.
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