I can select the conf-alone sound in caller controls and even set up a bind digit for caller count once i am already in the conference using the

Conference Announce Count Inline  extension.

but what i cant figure out is how to speak the caller count when entering the conference room.  can anyone help with this? currently with conf-alone it only speaks the file when i am the only one left or there isnt anyone else in the room when i get there. i would like it to tell me the total callers of the room i am heading into.

thanks.