In VOIP, a voice will be transferred to shape the data are then forwarded through the internet network. In this way could be the right choice because it is cheaper. Why? because by using a frequency band (bandwidth), a compression system level may be greater than the compression force in mobile. For GSM, a normal voice that was encoded into 64 kilobits can be scaled up to 13.3 kilobits per second, and the sound quality is already familiar our ears via mobile phone.
Amazingly, according to the information we have that, the compression system is done in Digital Telephone Central Indonesia (STDI), for a 64-kilobit channel capacity can be used for 4 to 5 vote. Problem compression, indeed VOIP technology expert, the system compresses done such that each channel is no longer at 13.3 kilobits, but may be reduced again until it reaches the 8 kilobits, of course, will still be smaller.
VoIP technology is very useful for conversation, both long distance and international. Because of the perfect compression can reduce the cost to the conversation many times, of course, can save users. When asked about voice quality, VoIP technology is not much different when wearing conventional manner. However, it's all still affected by Are Some factors, one of which is how well the quality of telecommunications networks in your area and interlocutors.
General description, utilize VOIP technology to change the original sound man into a series of the digital signal which will then be reduced in size (the English term compression) in some parts. Of course, also, will not reduce the amount of existing information. Next, will be divided again into packets of Internet Protocol (IP), which is then transmitted via the Internet, the reverse process is performed on the receiver side.
Examples of network protocols are used to implement VoIP:
- Session Initiation Protocol (SIP)
- Media Gateway Control Protocol (MGCP)
- Session Description Protocol (SDP)
- Real-time Transport Protocol (RTP)
- Inter-Asterisk eXchange (IAX)
H.323 is one of the few existing VoIP protocols. Its application extends for a distance traffic, for example to service the Local Area Network (LAN). However, because of the development, complex protocols such as MGCP and SIP, H.323 shrinking distance deployment. In particular, the Session Initiation Protocol (SIP) has received widespread market penetration by VoIP.
Advantages of VoIP
- Data network infrastructure used for the sound that is useful when companies own network. If possible, the existing network can also be constructed VoIP network more easily. Without having to spend additional capital for additional monthly voice communications.
- The cost is relatively cheap for a direct connection from a distance. The main emphasis of VoIP is in terms of cost. By connecting the two individuals in different locations via the Internet, the cost of conversations can certainly be reduced.
- Allows also to be merged with local telephone networks that have been there now. With the availability of VoIP network gateway form which can be connected via an existing PABX office. Interoffice communications also allow using a normal telephone.
- The bandwidth required tending to be smaller than a regular phone. Techniques that allow voice data usage only requires 8kbps bandwidth or more.
- Several large networks have supported the company consolidated to a VoIP network. For example in Indonesia is VoIP Rakyat.
- Use of the equipment is very varied, for example from a PC connected to a regular phone or an IP phone handset etc.
The Downside of VoIP
- Because VoIP is changing the voice into data, then there will be a pause in every conversation that occurs. Unless you are using broadband connections.
- The quality of sound clarity unequal PSTN networks, this is the effect of sound compression. Because bandwidth is reduced, then the sound quality is lowered. But if the Internet connection you're using a broadband connection / broadband, such as Telkom Speedy, the sound quality will be very clear, so even more clearly than Telkom and the connection will not be dashed.
- Regulation of the government of Indonesia that restrict the use of VoIP to connect to the network owned by Telkom.
- Had not connected to the internet 24 hours, it is necessary for the agreement to be interconnected.
- There is no guarantee of the best quality when VoIP is connected to the internet.
- Equipment which tends to be more expensive. VoIP equipment will be connected to PABX (IP telephony gateway), so the price is relatively more expensive. Hopefully, the growing popularity of VoIP, the price of the equipment could be getting down.
- If you use the internet and computers before the NAT (Network Address Translation), it would require a special configuration so that VoIP can run.