[Asterisk-Users] (Yet another) Music on hold problem and another...

[C F]

Do you always like to repeat someone elses answer? or only when you
don't read the whole thing?


On Tue, 15 Mar 2005 19:28:01 -0800, Tom Samplonius
<tom.samplonius at gmail.com> wrote:
> On Tue, 15 Mar 2005 16:29:53 -0500, C F <shmaltz at gmail.com> wrote:
> > Your problem with MOH has to do with the fact that Asterisk needs a
> > timing source to play back music on hold. So when there is an audio
> > stream coming in asterisk can use that incoming stream as a timing
> > source. If however silence suppression is used, then asterisk has no
> > timing source therefore MOH doesn't work. You can get a timing source
> > by loading ztdummy. Look up asterisk timing on the wiki
> > The wiki is located here:
> > www.voip-info.org
> 
>  That is actually incorrect.  Zaptel timing is not required or used by MOH.
> 
>  But Asterisk's RTP implementation does use the incoming stream to
> time the outgoing stream.  So if there are no incoming packets, no
> outgoing packets are sent, and you don't hear the music.  This means
> that you can't use VAD/Silence detection on any SIP end-points with
> Asterisk.  This affects any sounds played by Asterisk, including
> annoucements, ring-backs, etc., not just MOH.
> 
> Tom
>