3G-324M is the 3GPP umbrella protocol for video telephony in 3G mobile networks.

The 3G-324M protocol operates over an established circuit switched connection between two communicating peers. 3G-324M is an umbrella specification to enable conversational multimedia communication over Circuit Switched (CS) networks and has been adopted by the 3GPP. 3G-324M is based on the ITU-T H.324 specification for multimedia conferencing over Circuit switched networks.[1][2] 3G-324M is composed of the following sub-protocols:

The 3G-324M specification using the Circuit switched network allows delay sensitive conversational multimedia services such as:

3G-324M is agnostic to the actual Circuit switched network that uses it. It can run as easily over UMTS as well as TD-SCDMA networks.

3G-324M is a proven solution for conversational multimedia based services that packet-based wireless networks cannot deliver because of inherent overhead, BER sensitivity, and variant routing delays. 3G-324M operating over a circuit switched channel between two communication peers guarantees the fixed-delay quality of service for multimedia communications. Combining Circuit switched 3G-324M services with packet-based SIP services such as presence can leverage the strength of both networks to enable new types of differentiated and innovative mobile 3G services.


Audio Codec

Video Codec


  1. IMTC Press Coverage, International Multimedia Telecommunications Consortium (IMTC), April 1, 2001 to November 16, 2004.
  2. Orr, Eli. News & Analysis: Understanding The 3G-324M Spec, EETimes.com website. January 21, 2003.

External links

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