Huawei v200r001 user manual VoIP Configuration, VoIP Overview

User Manual - Configuration Guide (Volume 3)	Chapter 1
Versatile Routing Platform	VoIP Configuration

Chapter 1 VoIP Configuration

1.1 VoIP Overview

VoIP is the abbreviation of Voice over IP. What we often called IP phone is a typical application of the VoIP. The application of VoIP in router makes it possible that the voice service can be implemented through the IP network, including the plain phone service and fax.

VoIP is implemented through voice packet. In VoIP, the digital signal processor (DSP) splits the voice signals into frames and stores them in packets for transmission. VoIP is mainly a software solution. It needs the support of voice port board added to the router.

At the beginning of 1995, a kind of software product that could make toll calls on Internet was available for the first time, and this phone service implemented on Internet was called Internet phone, this was the early form of the IP phone. Through five years of development, the IP phone has been developed all over the world as a new type of phone service, which poses as a great threat to the plain phone service.

The development of IP telephone benefits from the promotion of technology and the drive of market.

The years of technological accumulation makes the technology of transforming voice into IP technology increasingly mature and practical. At the same time, the high-speed development of the integrated circuits (IC) causes the price of the core component of the IP phone—DSP going down greatly, these factors contribute to the technical possibility for the promotion of the IP telephone.

The drive of market benefits is also a significant reason for the rapid development of the IP phone. Using the VoIP network composed of IP voice gateway and other device, we can bypass the toll calls to the data network, thus greatly reducing large bill for toll expenses and benefits the subscribers.

Through the development from the beginning of 1990s till now, the IP phone has developed form the IP software period to the IP gateway period. And also the current VoIP application has developed from the simple PC products with voice service to the telecommunication service with multiple services and functionality such as high reliability, high quality voice, fax and data transmission.

At present, IP gateway is used to interconnect PSTN (Public Switching Telephone Network) and the Internet, so as to mature the technology of PC to phone, phone to PC and phone to phone. In addition, voice quality is greatly improved and the commercial requirements can be satisfied.

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