[Asterisk-Users] Horrible BUZZZZ noise when sounds/music play on SIP phone?

[David Boyd]

On Wed, 2004-11-24 at 04:14, Mike Dent wrote:
> Hi,
> I've recently set Asterisk up, 1.0.2 version. With 1 x X100P card and
> 1 SIP phone.
> I've noticed some horrible buzz/rasping type of sounds! These seem to occur when
> * is trying to play back some audio or sound to me?
> 
> E.g. If I have an exten rule which plays one of the music on hold
> files when I dial 800 lets say,
> I get a really loud buzz for about 2 seconds and then the music plays.
> 
> E.g. 2. If I dial 500 to connect to Digium, as the call is connecting
> I get the same loud
> buzz noise for 0.5 seconds or so.
> 
> Not sure where this is coming from? I did a search on the wiki for
> buzz/hum/rasp but could
> not find anything.
> 
> Thanks
> 
> Mike
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Sound like an IRQ issue. Check to see if you are sharing an interrupt on
your X100P card, take a peek with " cat /proc/interrupts (on linux at
least) :)  


Dave