asterisk users - Oct 2005 - Can anyone explain reason for this echo

Our configuration is as follows:


SIP phones -> TE410P -> PSTN

When a SIP handset makes a call to other ISDN numbers - no problem.
When a SIP handset make a call to analogue numbers - echo.

I know for certain that the problem is at our end. Why?

If I call our Asterisk box via Disa and then place a call to one of the
problem analogue numbers (native Zap bridge) I don't get any echo. So the
echo seems to occur only when using a SIP handset and making a call to an
analogue number.

Can anyone provide a logical explanation for this?
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Hi,

Not uncommon what you are seeing. Try playing with your echo can. type 
Mark2 etc. on your analogue zaps also try tweaking your tx & rx gain 
using ztmonitor to view your incoming levels. Analogue is def. a lot 
more prone to echo than ISDN so get tweeking ;  )


Cheers,

MICHAEL TOOP
Tel > 011 602 9309
Fax > 011 656 1342
Mobile > 083 364 2370
Web > www.bizcall.co.za



Eric Bishop wrote:
> Our configuration is as follows:
>
>
> SIP phones -> TE410P -> PSTN
>
> When a SIP handset makes a call to other ISDN numbers - no problem.
> When a SIP handset make a call to analogue numbers - echo.
>
> I know for certain that the problem is at our end. Why?
>
> If I call our Asterisk box via Disa and then place a call to one of 
> the problem analogue numbers (native Zap bridge) I don't get any echo. 
> So the echo seems to occur only when using a SIP handset and making a 
> call to an analogue number.
>
> Can anyone provide a logical explanation for this?
>
>
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Eric Bishop <asterisk.eric@gmail.com> wrote:
>If I call our Asterisk box via Disa and then place a call to one of the
>problem analogue numbers (native Zap bridge) I don't get any echo. So
the
>echo seems to occur only when using a SIP handset and making a call to an
>analogue number.
The echo is probably always there.  You only notice it with the SIP
phone because of the additional latency that this introduces.

Doug
-- 
Doug Meredith (doug.meredith@systemguard.com)
SystemGuard - Oracle remote support
877-974-8273 (87-SYSGUARD)
506-854-7997
www.systemguard.com