asterisk users - Feb 2008 - Can AMD detect Service Provider Message.

Is there a way to detect Service Provider message such as invalid number, using
AMD or some other application.

Regards,
Sanjay.

This is something that has been bugging me for awhile.  I have noticed it on
multiple systems with different hardware, with and without zaptel cards, and
various versions of Asterisk in the 1.2 and 1.4 branches.

A bit hard to describe.  Using a SIP hardphone I log into my voicemail at which
point Allison says "you have x messages.....".  There are various
other prompts that exhibit the same problem but that is one easy to explain and
reproduce one.  The problem is there is a slight 'pop' sound usually
during the first syllable of each word.  So the prompt sounds like
"y[pop]ou h[pop]ave t[pop]wo me[pop]ssages".  If I dial *43 to do an
echo test and Allison says "you are about to enter an echo test....."
it's not there so it's only in certain modes this happens.

It's relatively minor and not something people generally complain about but
it's definitely there and (at least to me) kinda makes the system seem to be
a bit less polished sounding.  I thought it had something to do with the prompts
I am using but when I play back the actual files in a sound player I don't
hear those pops.  I tried various formats including gsm, ulaw etc. but it
doesn't change anything.

Anyone know if this is a documented issue and if so are there any potential
solutions