This Recommendation provides a method for the rapid creation or reconfiguration of media streams under the control of endpoints or third parties. It is especially useful for operations such as the redirection of a caller to an automatic voice response unit, or the initiation of new media channels, such as a modem data channel, in response to detected events, such as modem answer tone. It also supports the rapid redirection of media streams from a called party to an automatic answering device.

This revision introduces a number of corrections and clarifications by incorporating technical and editorial corrections from the H.323-series Implementers Guide (03/2011).