The architecture concerning the Multimedia Resource Function is presented in Figure 4.1 below.

The scope of this specification is limited to the area shown within the green shading. The MRF is split into Multimedia Resource Function Controller (MRFC) and Multimedia Resource Function Processor (MRFP). Tasks of the MRFC may consist of the following:

• Control the media stream resources in the MRFP.
• Interpret information coming from an AS and S-CSCF (e.g. session identifier) and control MRFP accordingly.
• Generation of CDRs.
• Advanced control of conferences (e.g. floor control)

Tasks of the MRFP may consist of the following:

• Control of the bearer on the Mb reference point.
• Provide resources to be controlled by the MRFC.
• Mixing of incoming media streams (e.g. for multiple parties).
• Media stream source (e.g. for multimedia announcements).
• Media stream processing (e.g. audio transcoding, media analysis).
• Manage access rights to shared resources in a conferencing environment (e.g. floor control).

The Mp reference point allows an MRFC to control media stream resources provided by an MRFP.