[Asterisk-Users] Echo in CAPI channels

[Derek Conniffe]

Hi Peter,

Ah yes - I get you now - sorry for misunderstanding and I think you've 
hit the nail on the head.

I have a couple of budgetones and a Cisco 7940.  I do have a few FXS 
cards so I'll have to put one in the * server and see if there is no 
echo when I talk to someone on a remote POTS line - I'd say the "echo" 
will be gone.  For sure the echo I get is quick (and it could easily be 
1/10th of a second which is about the time that you are suggesting).  
I'll also have to play with the capi.conf echo options and see if I can 
remove the echo that way.

Thanks,

Derek

Peter Svensson wrote:

>What do you have in your end was what I meant. What do you talk in? An
>isdn phone? A pots phone? Those are really the only two options where you
>do not have an added delay (actually, the zaptel cards add 1ms delay if
>the call is cross-connected between cards). If you use a voip technology
>phone such as a softphone or a hard ip phone you will have at an absolute
>minimum an additional 40ms round trip time, but more realisitcally twice 
>that at least. That moves the echo from the sidetone to actually being 
>perceived as an echo.
>
>Peter
>  
>
 


Derek Conniffe
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