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Home  About Voip VoIP Technology for beginners
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VoIP Technology for beginners |
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 VoIP Technology (Voice over Internet Protocol) is an alternative in today's communication. Allows you to carry conversations over the Internet. Speech signal is subjected to compression and then divided into packets and sent over a network. The node receiving such a process is played in reverse order, resulting in receipt of a normal speech signal. This service allows you to talk a huge reduction in costs compared with traditional fixed-line telephony.
The advantages compared with traditional telephony:
* Independence from operators / state monopoly (freedom of choice and a potentially greater privacy)
* Often zero cost VoIP calls
* Lower cost of calls from fixed-line telephony (normally only for calls abroad)
* Full user mobility (roaming problem has limited significance)
* Low cost of infrastructure (as compared with traditional phone lines)
* Przyszłościowymi integration with services such as data transfer or image
Disadvantages in comparison to traditional telephony:
* Greater reliability of services
* The need for additional (today) the equipment or software, and Internet links
* The implementation of the cost of buying more hardware (eg cameras) to the end user
With VoIP, you can use the links to:
* Other VoIP users
* Fixed-line telephony users
* Mobile phone users
This could be done:
* Using a computer connected to the Internet with appropriate software, communication
* Using the IP phone, VoIP gateway or configured to be used for one or more VoIP operators
* Using the so-called. scratch card pre-paid for the performance of international talks
Here are the types of calls, according to which operators posegregowaliśmy for you. The most common practice is to use VoIP for the implementation of foreign connections, the cost of which is several times smaller than that of traditional mobile telephony. The various systems differ not only the price of calls, but also the way to "connect" to. In the case of scratch card connections are made through the Internet using / connect dodzwaniane (type 0-801, but the numbers simply "fixed" by some operators offer VoIP). In the case of IP phone, VoIP gateway, or the program (a standard IM or VoIP) call to execute using the existing Internet connection (it is possible to buy the accompanying number of fixed telephony, which allows you to receive incoming calls). Currently, for this type of call, we can call on any telephone number around the world (some operators limit the possibility to pay a call hotlines and emergency telephone numbers). The software can be divided into three main groups. First, the programs designed for voice communication. The second group is messaging, where the functionality has been expanded to include the transmission of voice. A third group of servers used to handle VoIP calls and PBX centralek. The biggest problem they face with VoIP telephony, is the quality of the connection. The current structure of the Internet often makes it impossible to provide a minimum continuous transmission of data (QoS) required for the perfect quality calls. If too slow connection, there is distortion, the sound becomes mechanical, and the words discontinuous (Jitter, Lag). An additional difficulty is greater for the delay, which in extreme cases prevent a smooth conversation. In most cases, however, manage to work around this problem by using advanced methods of audio compression. However, with the combination 256KB / s quality of conversations using the QoS `u is no longer very good. Another hurdle is the lack of opportunities in most cases, the emergency numbers to call. This is due to the location of the caller's problem and hence its corresponding forwarding notification alert to the nearest unit.
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