<div dir="ltr"><div class="gmail_default" style="color:#660000">The limitation of 8khz sample rate (ulaw or alaw on pstn) should only affect the audio spectrum - for example there will be a loss of frequencies above 3.3-4khz if the band pass filter is done correctly, or an overly loud static sound where higher frequencies were in the original if not.</div><div class="gmail_default" style="color:#660000"><br></div><div class="gmail_default" style="color:#660000">If by 'broken up' you mean to say that there are periods of no audio, then there is a separate issue affecting the audio stream such as packet loss or problems getting the audio file to stream reliably.</div><div class="gmail_default" style="color:#660000"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Oct 14, 2014 at 10:47 AM, <span dir="ltr"><<a href="mailto:asteriskusers@dovid.net" target="_blank">asteriskusers@dovid.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi,<br>
<br>
I have a client that wants a phone system that will play sounds from a sleep machine. I tried using all different formats (GSM, WAV, WV49, MP3 etc.). Over SIP it was OK however with the PSTN it broke up from time to time. I assume this has to do with the fact that the PSTN is limited to 8khz. Is there something I am missing here or is this simply a limitation of the PSTN?<br>
<br>
Regards,<br>
<br>
Dovid<span class="HOEnZb"><font color="#888888"><br>
<br>
<br>
<br>
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