What is VOIP

VoIP stands for Voice over Internet Protocol.This technology enables you use the Internet to make and receive telephone calls instead of the plain old telephone system (POTS).The basic principle of Voip is very simple.

  • Voice sounds are picked up by a microphone and digitized by the sound card.
  • The sounds are then converted to a compressed form, compact enough to be sent in real time over the Internet, using a software driver called a codec. The term codec is short for “encoder/decoder”. The sounds are encoded at the sending end, sent over the Internet and then decoded at the receiving end, where they are played back over the speakers.
  • For VoIP, you need a broadband Internet connection, plus a traditional phone and an adapter; a VoIP-enabled phone; or VoIP software on your computer. , and matching codecs at each end.

Basics VIP Elements:

  • Codec
  • Protocol
  • Hardware Interface

Codec is the process of voice compression and decompression. First of all voice is encoded from analogue to digital IP Packets and decoded back to analogue voice at the receiver end. The most popular codes are G.711,G.723.1 and G.729A/B

Protocol . The way the VOIP devices communicate , they can only communicate if they are using the same protocols . The most famous protocols are H.323 and SIP

Hardware Interface: VOIP hardware interface are of two type that are use to connect the existing phone line or phone equippment

FXO Allow VOIP device to communicate with the ordinary telephone ssytem
FXS Connect to the ordinary telephone or fax