VoIP – Voice over IP

VoIP or Voice over IP is a method of voice communications in an IP network. Worldwide, VoIP is has the highest reliability and availability is optimized. VoIP – Voice over IP network can run both local area network (LAN) or the public internet. Voice over IP is actually based on packet oriented Internet Protocol.

Protocols of VoIP

VoIP is also known as Internet telephony, voice over broadband (VoBB), IP telephony,broadband telephony, and broadband phone. Previously we have written about Video Conference and Videoconferencing. There are various existing protocols for VoIP existing like MGCP, SIP, H.323, RTP, UDP, SDP, RTP etc.

The main differences with VoIP and our usual telephony is the variable quality – usual telephony almost always have a standard sound quality.

Other factors play in VoIP

The first RTP packets are packed into UDP packets are used with an additional IP header. The transfer of technology on the physical medium is then added to a package and is system dependent. This creates an overhead of 54 bytes per packet. However, this overhead is decreased in practice to few by few bytes depending on other variable parameters of that VoIP settings. In other words, VoIP, although looks very easy and consistent technology, in practice VoIP, to some extent has unreliabilities, especially when the quality of sound matters most.

Advantages of VoIP

Although the question of quality of sound, packet loss, Lack of redundancy, Security, about 160+ seconds delay comes, VoIP is used in Corporate Sectors widely. The major reasons of using VoIP are certain advantages :

• Secure calls can be done on VoIP using existing less costly technologies.
• It can transmit more than one call at one time using a single connection.
• To the corporate, the technology can integrate phone calls, faxes, voice mail, e-mail and VoIP in to one-device system. This makes VoIP successful in corporate sector

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