This Recommendation uses the package mechanism to define a parameter syntax to provide a means of referring to provisioned announcements and variable content to be played within them. As indicated in documentation of the packages concerned, this syntax containsoptional features, the support of which is indicated by the presence of the additional packages on the termination. The syntax may be used to evoke multimedia content. In addition, this Recommendation adds a series of functional packages to the Megaco/ITU-T H.248.1 protocol to control an Audio or Multimedia Resource Function which may reside on a media gateway or specialized audio server.