[asterisk-users] scratchy sound

[Stefan Schmidt]

Hi,

sounds for me like when i use an headset and the microfone handle 
scratches on my beard while i talk ;)

maybe you have a network cable whitout screening. I had bad problems on 
different phones which sounds like that you have cause of electric or 
magnetic inteferences but when i changed the network cable everything 
was fine again.

do you have made an echo test lie exten => 999,1,Echo() to hear yourself 
and try to find this issue.

best regards

steve smith

Vieri schrieb:
> 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
>
>
>
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