VoIP Mailing List Archives

[asteriskusers at dovid...]

Hi,

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?

Regards,

Dovid



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[sgriepentrog at digium...]

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.


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.




On Tue, Oct 14, 2014 at 10:47 AM, <asteriskusers@dovid.net (asteriskusers@dovid.net)> wrote: