cacheannounce always plays the default announce to the caller.

This is a example of how to use the mem cached versions of AmAudioFile: 
AmFileCache/AmCachedAudioFile.

The AmFileCache class can load a file once (AmFileCache::load), 
and the AmCachedAudioFile then uses the file from memory. AmFileCache 
objects can e.g. be created at startup and passed to the session object
which creates AmCachedAudioFile objects to play back the files. 

Measurements with 100 calls playing back default_en.wav encoded as PCMU
have shown a 4-5% performance increase (192,607,161 Ir's vs. 201,569,407 Ir's) 
over the normal not cached announcement application.

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1.5.1

Module Documentation: cacheannounce Application

Readme file

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