The media server control markup language (MSCML) is a markup language used in conjunction with session initiation protocol (SIP) to provide advanced conferencing and interactive voice response (IVR) functions. If used with a decomposed media server, MSCML is terminated at the media gateway controller (MGC) level as it is associated with SIP. Where the decomposed media server uses ITU-T H.248, MSCML requests need to be translated into the applicable ITU-T H.248 functionality. This Recommendation provides guidance on mapping MSCML functions to ITU-T H.248 protocol information elements, packages and procedures.

Furthermore, this Recommendation defines a package to enable gain control (fixed and automatic) on incoming and outgoing streams.