[Freeswitch-users] audio quality issue

Sun Dec 19 01:56:17 MSK 2010

By "improve" your kernel I just meant resolve the timer frequency issue or
even better stop using xen altogether until you figure out why you have
audio issues.

I assume you mean the voicemail messages sound good when you listen to them
as an attachment in your email, and that your audio quality is always bad in
real time from the server. Spitting an audio file into a codec bit by bit in
real time requires decent precision to pull off ... recording each frame of
audio you recieve into a file does not require precision timing. That is why
the switch could sound poor and create perfect recordings ... although it is
only a guess.

Are you testing with the phone and switch on the same LAN? Do you have
physical access to the switch system and is it a regular old unvirtualized
OS now? There seems to be either an issue with your FS system, or an issue
with the network conditions between you and it. Sadly, I have not
encountered enough RTP quality issues to be good at troubleshooting them or
I might have great advice at this point. I just happen to be bored and
feeling holiday helpful :)

On Sat, Dec 18, 2010 at 9:11 AM, Rafqat . <rafonline at hotmail.com> wrote:

>
> I upgraded to dev snapshot (still on Xen) - still had audio issues.
>
> I got rid of xen server and installed centos 5.5 and freeswitch only -
> timer frequency warning disappeared - still felt audio was not what it
> should be.
>
> What I still dont understand is why when i playback my recorded voicemail
> messages the quality is good.
>
> Sometimes I even have issues leaving a message after the voicemail tone,
> the IVR seems to think i have ended recording the message before even
> starting.  The voicemail tone itself can be very high pitch at times.
>
>
> Any help will be much appreciated.
>
> Chris - can you please point me to some docs on how to improve my kernel
> (sorry but i am newbie to unix).
>
> Cheers
>
> Raf
>
>
> ------------------------------
> Date: Fri, 17 Dec 2010 18:05:09 -0500
> From: chris at cloudtel.com
>
> To: freeswitch-users at lists.freeswitch.org
> Subject: Re: [Freeswitch-users] audio quality issue
>
> Improve the kernel and in your situation you will most likely improve your
> audio. You can't expect perfect audio when the thread handling RTP is waking
> up later than its designated time (after sleeping for the codec timing). The
> switch tests for the possibility of this issue on startup when it calibrates
> your clock offset ... thus it warned you :)
>
> "-nocal" will simply skip the process of recognizing and warning that your
> kernel timer is slow, but will not alter performance in your situation
> (unless I am missing something)
>
> On Fri, Dec 17, 2010 at 4:30 PM, Rafqat . <rafonline at hotmail.com> wrote:
>
>
> I will try the dev snapshot.
>
> cheers
>
> Raf
>
> > Date: Fri, 17 Dec 2010 15:28:49 -0600
> > From: anthony.minessale at gmail.com
>
> > To: freeswitch-users at lists.freeswitch.org
> > Subject: Re: [Freeswitch-users] audio quality issue
>
> >
> > if you insist to remain on 1.0.6 try it with -vm -nocal cmd line options
> > as i already stated you should try the development snapshot
> >
> > On Fri, Dec 17, 2010 at 3:22 PM, Rafqat . <rafonline at hotmail.com> wrote:
> > >
> > > btw.  I have no audio issues when making calls between phones through
> > > freeswitch (voice quality is very good).
> > >
> > >
> > >
> > > ________________________________
> > > From: rafonline at hotmail.com
> > > To: freeswitch-users at lists.freeswitch.org
> > > Date: Fri, 17 Dec 2010 21:19:11 +0000
> > > Subject: [Freeswitch-users] audio quality issue
> > >
> > >
> > >
> > > Hi,
> > >
> > > I recently installed freeswitch 1.0.6 on centos 5.5 (hosted on xen
> server).
> > > I feel as if the audio quality is not as good as what it should be (6-7
> out
> > > of 10).  This is apparent in calling the default voicemail IVR,
> sometimes I
> > > have issues leaving a message, sometimes I hear some weird noises.
> However,
> > > I have no issues with the quality of the recorded voicemail message I
> leave,
> > > it sounds fine on playback.
> > >
> > > Is this an issue with my phones (Flexor 500)?  I have a softphone which
> > > doesn't seem as bad but still has issues.
> > >
> > > I also get the following message on startup of freeswitch:
> > >
> > > 2010-12-17 21:17:39.138958 [WARNING] switch_time.c:206 Timer resolution
> of
> > > 4000 microseconds detected!
> > > Do you have your kernel timer frequency set to lower than 1,000Hz? You
> may
> > > experience audio problems.
> > >
> > > I assume its related.
> > >
> > > Any help will be much appreciated.
> > >
> > > Cheers
> > >
> > > Raf
> > >
> > > _______________________________________________ FreeSWITCH-users
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> >
> >
> > --
> > Anthony Minessale II
> >
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