http://www.rfc-editor.org/rfc/rfc2897.txt
RFC 2897: Proposal for an MGCP Advanced Audio Package, D. Cromwell2000-08-01T23:00:00-00:00This document is a proposal to add a new event/signal package to the MGCP (Media Gateway Control Protocol) protocol to control an ARF (Audio Resource Function) which may reside on a Media Gateway or specialized Audio Server. This memo provides information for the Internet community.