I found I am already using 16 KHz profile. .SetTtsParameters("cepstral", "Allison-16kHz");

I read this under FS wiki on Cepstral under 'Gotchas':
-------------
Using a 16khz voice and 0.03 for RTP Packet Size (Sipura Setting), it will sound horrible. Workaround: modify RTP Packet Size to 0.02 in Sipura config, under Advanced/SIP section.
-------------

Do you think that is my problem? Is this to be done in FS configuration?

Malay

On Mon, Feb 21, 2011 at 2:35 PM, Michael Collins <msc@freeswitch.org> wrote:
It depends on why there is choppy audio. My guess is that going to 16k won't help. You should update to latest git and re-test, preferably on a system that is not in production. See if you can narrow down the conditions under which the audio is not good. Does it happen when the system is under load? Does it happen on every call, or only on certain calls? Things like that.

-MC

On Sun, Feb 20, 2011 at 12:51 PM, Malay Thakershi <mthakershi@gmail.com> wrote:
Hello,

I use Cepstral in my mod_managed FS application. I mainly use Session.Speak and PlayAndGetDigits in my code to play WAV / audio text.

When I started using FS and got a stable program running, I used Cepstral Allison 8 KHz voice. But frequently I get choppy type of sound. Earlier it was acceptable but now some callers seem to have difficulty understanding the call audio.

Would it help if I get 16 KHz sounds / Cepstral license? What are changes I would need to make?

Thank you for any help.

Malay Thakershi

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