I have used a number of different modules - the one I like is this http://geekmatic.in.ua/pdf/Catalex_MP3_board.pdf, I made a speaking clock connected to MSF receiver. (Can be done with GPS)
You have to put a wire to one one side of the playback indicator if you want a busy signal, this I used to check if the module was already playing, and when the file playback had finished. (needed for composing messages)
About 80 individual mp3 files whole announcements controlled with 16F628A
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