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VoIP - Voice over IP 


VoIP Voice over Internet Protocol (also called VoIP, IP Telephony, Internet telephony, and Digital Phone) is the routing of voice conversations over the Internet or any other IP-based network. The voice data flows over a general-purpose packet-switched network, instead of traditional dedicated, circuit-switched voice transmission lines.


Some people are talking about double play where you can make use of your Internet link for both data and Voice while phone calls can be made to any land or cell phone all over the world using the Internet infrastructure at very low rates, this is really a revolution in communication industry. You only pay for the Internet, which is a must today!




Most standards-based solutions use either the H.323 or Session Initiation Protocol (SIP) protocols. A number of proprietary designs also exist. These typically support features such as call waiting, conference calling, and call transfer.

Transport protocols:

Existing secure transport protocol
Unsecure transport protocol
New secure transport protocol proposal

Signaling protocols:

VoIP Codecs comparison table

Session Initiation Protocol (SIP)
defined by the IETF, newer than H.323
defined by the ITU-T
Megaco (a.k.a. H.248) and MGCP 
both media gateway control protocols
Skinny Client Control Protocol 
proprietary protocol from Cisco
proprietary protocol from Mitel
proprietary protocol from Siemens
the Inter-Asterisk eXchange protocol used by the Asterisk open source PBX server, Yate and associated client software
a proprietary peer-to-peer protocol used in the Skype application
a proprietary peer-to-peer protocol used in the Jajah SIP and IAX compatible webphone
open peer-to-peer protocol based on XMPP (Jabber) and being harmonised with the 'substantially equivalent' Google Talk protocol.

Several different speech codecs can be used for stream audio compression. Commonly used codecs for VoIP traffic include G.711, G.723.1 and G.729, all ITU-T-specified.

More VoIP related topics:


  1. VoIP non-profit bodies and organization.
  2. VoIP ATAs, gateways and switches vendors.
  3. VoIP top service providers
  4. VoIP news and updates.
  5. VoIP resources and statistics.
  6. VoIP testing tools (hardware and software).
  7. VoIP discussion groups and forums.
  8. VoIP special products and services.
  9. VoIP learning curve.
  10. VoIP where to buy?
  11. VoIP related and interesting links.


VoIP Latest News  

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