Recommendation ITU-T H.248.20 defines how the Local and Remote Descriptors are used within ITU-T H.248,ITU-T H.221 and ITU-T H.223 multiplexing (MUX) terminations to associate demultiplexed streams (logical channels) with ITU-T H.248.1 streams.This revision incorporates updates the allowed media values to align with the latest version of the Session Description Protocol (SDP).