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The letter from the VoiceoverIP can be literally translated as voice transmission through the IP network signal or video signal, so VoIP is a kind of IP network can simulate each other for audio or video of a technology. Simply put, it is through a series of transcoding, encoding, compression, packaging and other procedures, so that the voice data can be transmitted to the IP network side, and then through the opposite process, restore the original audio signal to for those receiving calls. Furthermore, VoIP or less to each other through the five program transfer voice signals, the first is the speaker end of the analog voice signal is encoded action, the key is the use of ITU-TG.711 speech coding standards conversion. Second packet to be compressed audio program sucked, simultaneously and add sites and control information, so they can in the third stage, that is, IP packet transmission stage, in the vast IP network to find the purpose of sending end. To the destination, IP packets will be decoded to restore the operation, and convert the final speaker, handset or headset can play the analog audio. In a basic VoIP architecture among the general contains four basic elements: (1) Media Gateway (MediaGateway): main role was to convert voice signals into IP packets role. (2) media gateway controller (MediaGatewayController): also known as the GateKeeper or CallServer. Responsible for managing the signal transmission and transformation work. (3) voice server: the main provider of telephone service is not, busy or busy when the voice response services. (4) Signal Gateway (SignalingGateway): the main work is in the process of the related exchange control, to determine whether the call set up and provide value-added services related applications. While VoIP has many advantages, but can never be completely replaced in the short term has a long history and mature PSTN circuit-switched network, so at this stage the two are bound to coexist for some time. In order to make the mutual communication between the two is bound to create an interoperability interface and pipeline, and the media gateway and the gateway device manager that played an intermediary color angle, as they have the media data streams and IP packets translated different types of network protocols supported. Its operation principle is that the media gateway voice into IP packets first, and then by the media gateway controller to control management, and decided to IP packet transmission path in the network. The signal gateway device is responsible for the SS7 signaling format to the IP packet. Internet phone to go meet the enterprise-class operating standards, must meet the following basic requirements: 1. Quality of Service (QoS) guarantee: This is the transition from the PSTN to VoIP, IPPBX replace the PBX's basic requirements. The so-called QoS is to ensure the minimum delay to voice transmission rate (400 ms) and packet loss rate (5-8%), so the current PSTN voice quality to achieve the basic requirements and standards, otherwise the implementation of VoIP will become the problem. 2.99.9999% of the high availability (HighAvailable; HA): Although VoIP has become the inevitable trend of the future, but long-PSTN and development compared to its maturity, stability, availability, manageability, and even scalability and so on, are still to be strengthened. Especially in the carrier-grade high availability on, VoIP must be the same as today's PSTN, to reach 6 9 (99.9999%) of the basic standards. VoIP is based on the current load balancing, routing and backup technologies to address these requirements and issues, in general, HA is a VoIP one of the objectives to be met. We are high quality suppliers, our products such as China designer leather briefcases , belting leather briefcase for oversee buyer. To know more, please visits large leather briefcase.
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