Hi Vieri, <br><br>The sound I hear does not seem caused by packet loss, jitter or latency, this problems usually produces a robotic or synthetic voice. It seems produced by some kind of bad contact (most probable). It is strange that you are seeing it using hard phones, I could bet on the headphones. Check also for electric interference, it is very common for line filters to break (broken capacitor usually) causing this kind of interference. Try also a different codec such as G.711 (improbable). <br>
<br>Flavio E. Goncalves<br><a href="http://www.asteriskguide.com">www.asteriskguide.com</a><br><br><div class="gmail_quote">2010/4/9 Vieri <span dir="ltr"><<a href="mailto:rentorbuy@yahoo.com">rentorbuy@yahoo.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br>
<br>
I'm experiencing a few (but meaningful) cases of audio distortion (or bad quality). I can't say yet how often this happens.<br>
<br>
Please listen to the following sound file:<br>
<br>
<a href="http://213.96.91.201/temp/distorted_audio_1.wav" target="_blank">http://213.96.91.201/temp/distorted_audio_1.wav</a><br>
<br>
This was recorded by Asterisk while the local SIP caller was dialing out a SIP trunk (so the problem is on my side, definitely, and it doesn't seem to be related to the bandwidth between my peer and the SIP provider). You can hear a scratchy sound during the whole fragment.<br>
<br>
I can't determine the possible cause of this kind of distortion. Maybe an expert ear can give me a clue. It shouldn't be the Asterisk server's CPU usage. Could it be a network issue between the Asterisk system and the SIP client? (it happens with SIP hardphones as well as softphones so I guess it's improbable it's the client software/firmware) Both softphones and hardphones use GSM and usually work fine (this kind of issue is not too frequent). The LAN isn't dedicated to voice but has QoS prioritizing VoIP.<br>
<br>
Could the cause of the distortion be network-related? And only on "my" side? Should I consider other causes?<br>
<br>
Thanks,<br>
<br>
Vieri<br>
<br>
<br>
<br>
<br>
<br>
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</blockquote></div><br>