[asterisk-users] jittery audio in voiceprompts

[Michelle Dupuis]

Isn't there a zap dummy (or something that uses the RTC) included in
Asterisk 1.40 that creates the timing source?  We don't install any external
timing sources and we don't have choppyness problems on pure sip
connections... 

Jason - is this on a standard PC motherboard (or a mini device like Linksys
WRT)?

MD

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve Murphy
Sent: Tuesday, February 27, 2007 6:29 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] jittery audio in voiceprompts

On Wed, 2007-02-28 at 10:12 +1100, Jason Lewis wrote:
> Hi,
> 
> I have been testing asterisk 1.4 with a view to deploying it in my 
> organisation and I am experiencing jittery voice prompts from the 
> voice mail system. I get this jitter even if I try a simple "hello 
> world" dial plan.
> 
> I have tried the release of 1.4 and also 1.4 svn and both display this 
> issue. I have also tried it on a dedicated linux box and on a linux 
> install running under vmware and both exhibited this issue. Linux box 
> is perhaps a little under powered, it is an Intel Celeron 467Mhz. I 
> tested with asterisk niced to -18, which did not change the problem.
> 
> I am using a Linksys SPA942 sip phone, using ALAW. I have tried gsm 
> and alaw prompts but that didn't solve it.
> 
> I am running Linux blue 2.6.16.20 on a debian stable machine. I have 
> been compiling and installing asterisk from source.
> 
> I have tried looking at the debug messages in asterisk but nothing 
> seems to indicate an issue.
> 
> I read somewhere that disabling X can help, but it did not in my case.
> 
> I am at a loss as to how I might track down the problem and fix it. 
> Any pointers would be greatly appreciated.
> 
> Thanks,

Jason--

What do you have installed, that will provide the 1Khz timing interrupts you
will need to function properly?

murf