Media server control using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3
The present document describes the implementation options and requirements for a media server control protocol to be used with the Mr and ISC interfaces.
This Technical Report includes the study of the following items:
- Define the requirements for a media server control protocol.
- Consider existing standards work that should be studied for the definition of a media server control protocol.
- Study and determine whether the media server control protocol should be carried in SIP or whether SIP should be used to setup a dedicated control interface.
- Study whether the AS directing the SIP session to the MRFC is always the same SIP-AS that should control the MRFC.
- Determine whether the media server control protocol should have a package naming and extension capability (similar to H.248 packages) to allow the support and registration of different media processing capabilities.
- Determine the SIP call flows and SDP capabilities associated with the media server control protocol and whether these SIP messages need to be passed through a S-CSCF proxy function or whether it is more efficient to have a direct AS-MRFC interface.
This Technical Report will be used to move into the specification phase for a media server control protocol.