Correct features for MOH files?

Hello everybody. I have been trying to generate with Audacity a proper audio file to play under the say() method on scripting mode. 

So far, I have aligned my audio to the features I found on the github samples page, which are 8,000 Hz, 8 bit, MuLaw .wav. 

However, my app only reads the normal text of the say() method, and afterwards I get a long silence until it hangs up.

Are there limitations such as the duration of the track, or other codec specs as well? This is the code I've been using:

say("Please hold a moment https://hosting.tropo.com/5060948/audio/myaudio.wav");






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