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
ITU-T H.248.9-2005 history
2009ITU-T H.248.9-2009 Gateway control protocol: Advanced media server packages (Study Group 16)
2005ITU-T H.248.9-2005 Gateway control protocol: Advanced media server packages