[Asterisk-Users] Re: Echo on PRI/BRI?

[Paul Davidson]

>
> Date: Mon, 27 Feb 2006 15:01:54 -0600
> From: "Brent Torrenga" <lists at torrenga.com>
> Subject: [Asterisk-Users] Echo on PRI/BRI?
> To: <asterisk-users at lists.digium.com>
> Message-ID: <005a01c63be1$0a434920$7200a8c0 at oscar>
> Content-Type: text/plain;       charset="US-ASCII"
>
> Howdy:
>
> Does echo only occur on analogue PSTN lines, or can it also occur on PRI
> and
> BRI lines? If so, for the same reasons? This is a part of our
> consideration
> to transition to BRI.
>
>
> Sincerely,
>
> Brent A. Torrenga
> brent.torrenga at torrenga.com
>
> Torrenga Engineering, Inc.
> 907 Ridge Road
> Munster, Indiana 46321-1771
>
> 219.836.8918x325 Voice
> 219.836.1138 Facsimile
> www.torrenga.com
>

Brent-

Echo can occur for all sorts of reasons- analog conversions as someone else
already mentioned, 4 wire to 2 wire in particular- but could also occur in
the IP path due to network issues, and can occur on any sort of digital or
analog circuit due to various electrical or audio components. (one of the
more commonly neglected causes is poor handsets, that do a bad job of
isolating the speaker and microphone, or attempt to add sidetone incorrectly
(sidetone is the slight echo you should hear of your own voice- it's very
hard to hear, but without it, you get the feeling that you're talking to a
dead wire).  Conversion to BRI/PRI is a last step only, in my opinion,
unless you have other compelling reasons to do so- there's a lot of other
places to look first.

If you could describe more of your particular setup, I'd be happy to give
more detailed description of where the problems might lie.

-Paul Davidson
 PlanCommunications, LLC
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