With SCCP, the CUCM communicates the DSCP value for the end point to use for the media streams via the DSCPValue field in relevant messages (StationStartMultiMediaTransmissionMessage, RSVP... etc.). How does the CUCM communicate this info when interfacing with a SIP endpoint? SDP? I cannot locate any info regarding DSCP/Q0S in the Cisco SIP messaging guides. Do SIP Cisco end points simply hardcode EF for audio streams?
 
Received the following answer from Cisco Developer Services:

Your statements are correct.
- SCCP devices receive DSCP info
on a per call basis in the SCCP protocol messages
- SIP devices receive DSCP info
at boot up time via their TFTP config file, and this value is static for all
calls