[asterisk-users] jittery audio in voiceprompts

[Jason Lewis]

Hi Florian

> Actually, I doubt the timing source will be required if you only use
> playback or background commands with the supplied gsm prompts. We run
> lots of machines without it.
> 
> Timing sources are used for some cases of musiconhold, meetme and the
> likes, but not for regular stuff.

what about for playing voiceprompts?
> 
> Jason, if you do a 'vmstat 1' on the unix prompt when a call is run,
> does it ever hit an idle count of 0 somewhere ? If so, you have
> performance issues, if not, you'd probably look toward the network, or
> perhaps a silly Voice Activation setting in your phone.

I tested vmstat, it only occasionaly reaches 0, usually it hovers around
99-100. I made sure the phone does not do silence detection.

> 
> If possible, you could also try and look at a tcpdump capture of your
> traffic using wireshark to see if there is specific jitter or packetloss
> in the audiostream as it leaves the server.
> 

Thanks,

Jason