asterisk users - Feb 2006 - API or Call command

Is it possible to send an API command to dial an extension and playback a
specific announcement using application and appdata commands.

Scenario:
User adds different announcements daily (can't used fixed name for Playback
file).
Call command dials user and plays back specific announcement message.

I can do this manually by using the same Playback file name each time but is
possible to specify the playback file to be played in the API command???????

Any help much appreciated...