Voice Over Internet Protocol (VoIP)

Voice over Internet Protocol (VoIP) was created to allow voice communications devices (phones) to communicate over the Internet. Analog voice data is encoded as digital data and the resulting voice data is inserted into IP datagrams. VoIP is actually a suite of protocols created to support this function and there is more than one suite that can be used to provide this type of service. Voice communication is highly delay sensitive (that means any delay in transmitting part of the conversation is immediately detected by the user); therefore, quality of service protocols are also used to improve the quality of the communications path by prioritizing traffic and managing the available bandwidth.

Protocols Used in Voice over IP

• IETF:  Session Initiation Protocol (SIP)
  • Back-to-Back User Agent (B2BUA)
• Media Gateway Control Protocol (MGCP)
• ITU-T:  H.323
  • H.225.0
  • H.245
  • H.450
  • H.235
  • H.239
• Real-time Transport Protocol (RTP)
• Real-Time Control Protocol (RTCP)
• Real Time Streaming Protocol (RTSP)

THIS FILE IS A PLACEHOLDER FOR A FUTURE TUTORIAL