The hottest VoIP application scheme based on ADSL

VoIP application scheme based on ADSL line

with the rapid development of Internet lighting or car body, our work and lifestyle are gradually changing. In 1995, the world's first software product "Internet phone" that can make long-distance calls through the Internet came out, and then a new voice communication method with IP as the carrier has been displayed in front of us since the first half of this year. With the in-depth development of this technology, IP voice has gone through three stages: PC to PC, PC to and now to

in China, ADSL has been widely used as an Internet access method since 1999. The advantages of bandwidth/price ratio and simple access make ADSL the first choice for broadband access in households, enterprises and institutions. While the online business and e-mail business have been widely used, many units hope to realize voice communication through ADSL lines by adding nano raw materials into inks of different uses and types, so as to reduce office costs and improve line utilization

although voice communication can be realized through ADSL lines and VoIP devices, the implementation quality and security of its voice packets are much worse than that of dedicated networks because of their wide area transmission, so the government, military and other systems generally do not choose ADSL. For enterprises, ADSL is the cheapest access method, and its implementation quality and security are not as high as those of government, military and other systems, so enterprises prefer to choose ADSL + VOIP voice solutions

the following figure is a typical topology of using leased ADSL lines to build a voice network

generally speaking, enterprises that need to build voice networks have cross regional branches, and the central point in the figure is generally the headquarters of the enterprise. Since the number of headquarters personnel is generally large, and a large number is required, you can choose to configure a VoIP switch with a relatively large interface. Of course, if the headquarters already has a program-controlled switch, it only needs to configure a VoIP switch with a trunk interface. In addition, it is necessary to configure a guard at the central point (the guard can be placed at any place accessible by the network, but the most convenient is to place it at the central point) to complete the functions of registration, call admission, address translation, bandwidth control, etc. As each remote flexible packaging increasingly highlights the importance of the lightweight packaging attribute, the central guard needs to be configured with a fixed IP address (you can apply to the ISP) to access the center over a wide area

the above figure shows the central point configured with kvp6032 VoIP off, which can provide 144 doors at most, which can meet the needs of general central points. Kvp6032 also has built-in guard, agent and MCU functions. On the one hand, the built-in embedded guard protects user investment and improves application flexibility, on the other hand, it provides a high degree of integration and application stability. The built-in embedded agent can realize VoIP calls in NAT and firewall network environment without the help of external devices. The built-in MCU can realize the function of multi-party IP conference

in each branch, only one VoIP switch needs to be configured after the ADSL modem, and the number of closed interfaces or relays is selected according to the actual situation of the enterprise. In the figure, kvp6011 and kvp6017 VoIP switches are configured for branches, which can provide 4-way and 8-way or relay respectively, which is suitable for the application of small branches

after such a simple deployment and relevant settings of VoIP devices in various branches and headquarters, the IP voice communication between various nodes can be realized, and the public can be fully used to transmit voice, saving charges. VoIP off can also be directly connected to the trunk line to connect to the PSTN network. The machine connected to VoIP can select the internal line or external line through different dial-up settings. In addition, the relay function can also be used to realize the communication from local to different places and from local to different places. In this way, the long-distance cost can be saved, and the caller only needs to pay the city call fee

of course, when choosing VoIP products, enterprises also need to consider device compatibility, voice processing capability, QoS capability and other related performance to ensure that good voice communication is provided to the maximum extent in the existing network. (end)