asterisk users - Jul 2010 - MOH distorted voice in Native and MP3 format

Hello,

I have been facing an issue that voice is getting distorted sometimes in MOH
(MusicOnHold) application.
I have checked and confirmed that lame is properly installed, even tried
native formats (ulaw, alaw, gsm), but the randomly seen distortion in MOH
can't be eliminated.
I came to know about requirement of timing device for MOH and MeetMe and a
very good illustration by Andrew Kohlsmith on below old post.
http://www.mail-archive.com/asterisk at uc.org/msg01449.html

I think that today's high speed processors are capable of providing timing
signals, and there is no need of timing device, and ztdummy is sufficient
for that.
I am wondering if it is MUST to have a separate timing device for properly
functioning of MOH?



-- 

-MohammedShehzad
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On Wed, Jul 21, 2010 at 12:02:03PM +0530, MohammedShehzad
wrote:
> Hello,
> 
> I have been facing an issue that voice is getting distorted sometimes in
MOH
> (MusicOnHold) application.
> I have checked and confirmed that lame is properly installed, even tried
> native formats (ulaw, alaw, gsm), but the randomly seen distortion in MOH
> can't be eliminated.
> I came to know about requirement of timing device for MOH and MeetMe and a
> very good illustration by Andrew Kohlsmith on below old post.
> http://www.mail-archive.com/asterisk at uc.org/msg01449.html
This post is over 4 years old. Things have since changed.

There's no requirement for MoH to be in mp3 format. Generally just use
sound files Asterisk can play.

-- 
               Tzafrir Cohen
icq#16849755              jabber:tzafrir.cohen at xorcom.com
+972-50-7952406           mailto:tzafrir.cohen at xorcom.com
http://www.xorcom.com  iax:guest at local.xorcom.com/tzafrir

> > I have been facing an issue that voice is getting distorted sometimes
in MOH
> > (MusicOnHold) application.
> > I have checked and confirmed that lame is properly installed, even
tried
> > native formats (ulaw, alaw, gsm), but the randomly seen distortion in
MOH
> > can't be eliminated.
> > I came to know about requirement of timing device for MOH and MeetMe
and a
> > very good illustration by Andrew Kohlsmith on below old post.
> > http://www.mail-archive.com/aster... at uc.org/msg01449.html
>
> This post is over 4 years old. Things have since changed.
>
> There's no requirement for MoH to be in mp3 format. Generally just use
> sound files Asterisk can play.
Thanks Tzafrir, You are correct the post is very old.
It is also correct that there is no requirement for MoH to be in MP3
format, that is why I already replaced all MP3s with native formats
(ULAW, ALAW, GSM etc).
But even though the distortion is heard sometimes it is terrible and
making leaving the call unprofessional. That make me think and suspect
for timing related issues which seemed earlier.
The sound files plays music and voice in-between at some interval, is
there any issue of having music and voice same time in MoH?

Thanks.
--
-MohammedShehzad

Op 21-07-10 08:32, MohammedShehzad schreef:
> Hello,
>
> I have been facing an issue that voice is getting distorted sometimes in
MOH
> (MusicOnHold) application.
> I have checked and confirmed that lame is properly installed, even tried
> native formats (ulaw, alaw, gsm), but the randomly seen distortion in MOH
> can't be eliminated.
> I came to know about requirement of timing device for MOH and MeetMe and a
> very good illustration by Andrew Kohlsmith on below old post.
> http://www.mail-archive.com/asterisk at uc.org/msg01449.html
>
> I think that today's high speed processors are capable of providing
timing
> signals, and there is no need of timing device, and ztdummy is sufficient
> for that.
> I am wondering if it is MUST to have a separate timing device for properly
> functioning of MOH?
>
>
We have a customer reporting this too. It is very hard to reproduce though,
that's why I didn't put it on the bugtracker yet. I heard it myself
once.
It sounds very bad. We use format_mp3. Didn't try anything else.
Moving from ISDN to SIP seemed to have alleviated the problem a lot. Now
it's even harder to reproduce, but the customer says it still happens
occasionally.

Running on 1.6.2.6.

Ron

>
> --
>
> -MohammedShehzad
>

-- 
NeoNova BV
innovatieve internetoplossingen

http://www.neonova.nl  Science Park 140           1098 XG Amsterdam
info: 020-5611300      servicedesk: 020-5611302   fax: 020-5611301
KvK Amsterdam 34151241

Op dit bericht is de volgende disclaimer van toepassing:
http://www.neonova.nl/maildisclaimer

This sounds like a QOS issue (quality drops during heavy usage).  Since it
was more prominent when you were on ISDN, that pretty much verifies it for
me.  Can you prioritize voice traffic?

Op 21-07-10 18:05, Danny Nicholas schreef:
>
>> QOS on ISDN? Don't know how to do that.
>
>> Ron
>
>> NeoNova BV
>> innovatieve internetoplossingen
>
> It's not the ISDN part, it's the internal SIP part controlled by
the
> network.   Most calls on Asterisk consist of two or more legs;  one or more
> of these legs is a sip component controlled by network bandwidth.  If you
> are doing a backup or something else that reduces available bandwidth, QOS
> on the SIP leg goes to heck.
>
No, you don't understand. People dialong in over ISDN experienced
distorted MOH. No SIP involved. When the incoming numbers were ported
to a SIP trunk, the problem was much less.

Ron

-- 
NeoNova BV
innovatieve internetoplossingen

http://www.neonova.nl  Science Park 140           1098 XG Amsterdam
info: 020-5611300      servicedesk: 020-5611302   fax: 020-5611301
KvK Amsterdam 34151241

Op dit bericht is de volgende disclaimer van toepassing:
http://www.neonova.nl/maildisclaimer