Protocol
Introduction to H.323
H.323 is a protocol used for transmission of real-time video and audio data over a packet-switched network like Internet Protocol. It is a protocol standard for multimedia communications. H.323 protocol is maintained by the Study Group 16 within the ITU (International Telecommunication Union) Telecommunication Standardization Sector, also known as ITU-T.
Introduction
Session Initiation Protocol (SIP) is a signaling protocol used for establishing multimedia communication session over an Internet Protocol (IP) network. SIP was originally designed by Mark Handley and Henning Schulzrinne in the year 1996. Latest version of SIP is specified in RFC 3261 from the Internet Engineering Task Force (IETF) Network Working Group.
Introduction to IMS
IP Multimedia System or IMS describes the NGN (New Generation Networking) architecture for implementing IP-based multimedia and telephony services, defined by the 3GPP (3rd Generation Partnership Project). IMS supports multiple access types, including WCDMA, GSM, WLAN, CDMA2000 and any other packet data applications.
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