[asterisk-users] Listening to Allison voicemail prompt on SIP phone causes [pop] sounds.

[Trevor Peirce]

shadowym wrote:
> 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.
>   
Yes, this is something that has bothered me since I first started 
working with asterisk 1.2 way back when. It sounds to me like it's an 
artifact of appending multiple sound files together as it occurs at the 
beginning of each prompt that is played, or each digit when reading back 
caller id.

I too see this with gsm, ulaw, and the new slin files. I know it happens 
with 1.2 and 1.4 on Sipura/Linksys ATAs. I just listened to the prompts 
on my Aastra 9112i and the pop is there too but not nearly as apparent 
as on the ATAs.

I've got no idea where to even start trying to solve something like 
this, but I just wanted to respond that you're not the only one being 
bothered by it.

Best regards,
Trevor Peirce
-- 
Real CNAM data for incoming Caller ID @ www.cnam.info