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Friday, April 3, 2009

Why VoIP?

Advantages of VoIP should be noted, because they are obvious. It allows us to:

organize sessions audio connection. Using standard VoIP equipment, it is possible to organize a session of communication between Internet users (eg, c using Microsoft NetMeeting), or connect several geographically remote branch offices, to arrange a low-cost communication within the Wi-Fi. Users in a wireless access point 802.11, can use VOIP instead of cellular, get some new features: slick2Dial - an opportunity to make a call directly from a web site, voice auto-informants, based on IVR (Interactive Voice Response), audio and video , voice mail and a history of missed calls via the web, the definition of a subscriber in a network, build a corporate network. In this case, to conduct telephone conversations in the enterprise using the internal IP-network. However, the minimal version of such systems are used infrequently, and usually the corporate VoIP system to solve the following tasks:

provision of “mobility” of internal users;

communications between geographically distant branches;

association of telephone capacity in the branches of a single number plan;

organization of audio and video conferencing;

construction of call centers (call-centers).

This area of VoIP is very well-developed equipment manufacturers. The best-known suppliers are companies such as, Cisco Systems, Avaya, Nortel Networks. VoIP can reduce the cost of long distance and international calls, that just is one of the most common way of using VoIP. Connect via IP is cheaper due to the fact that the VoIP services using common (and cheap) network with packet switching (as opposed to more expensive networks from circuit switching, used in traditional telephony). Also, by using a voice codec (vocoder , voice coders) achieved significant compression of voice data. For example, when sending a voice stream in the digital telephony channel requires 64 Kbps (ISDN). In VoIP systems, using the most popular to date codecs, it takes much less bandwidth (6-13 Kbps).

There are two most popular options for connecting to the service providers and long-distance telephony:

Through the PSTN (public service telephone network) - connecting the user dials the “urban” room server VoIP provider, to authenticate (by pin-code) and gets him the desired number. To use VoIP for the scheme, enough to have a normal city number.

With the help of special “gateway” - in which case the user gets a special device - VoIP gateway, through which is able to make calls without using the PSTN (via the Internet channel, provided by ISP). In place of the locks, you can also use the program (including free) and hardware IP-phones

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