Hi Vieri, 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).
Flavio E. Goncalves www.asteriskguide.com 2010/4/9 Vieri <[email protected]> > Hi, > > I'm experiencing a few (but meaningful) cases of audio distortion (or bad > quality). I can't say yet how often this happens. > > Please listen to the following sound file: > > http://213.96.91.201/temp/distorted_audio_1.wav > > 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. > > 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. > > Could the cause of the distortion be network-related? And only on "my" > side? Should I consider other causes? > > Thanks, > > Vieri > > > > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
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