[Asterisk-Users] Cisco 7940G/7960G SIP phones local echo on * box.

[Tom]

At 12:12 AM 4/12/2004, you wrote:
>On Sun, 2004-04-11 at 13:01, Tom wrote:
> > Our new * server with Cisco SIP phones is now working pretty well.  But we
> > still have one problem that has not been resolved.
> >
> > The Cisco SIP phones have a consistent echo.  It sounds like about a 500ms
> > delay.  This echo is not heard from the POTS side.  It is heard when
> > calling another SIP extension in our office.  We are running 6.3 firmware
> > on the phones.
> >

To clarify my own message, there is no echo when calling local extensions 
SIP to SIP.  There is severe echo when calling through POTS (with the X101P 
cards) though.  But it is only heard on the SIP phones (inside).  The POTS 
callers do not hear an echo.  Turning echo cancellation on or off or with 
different values in zapata.conf made no difference.

Thanks,

Tom

> > Any suggestions would be appreciated.
> >
> > Many thanks,
> >
> > Tom
> >
>
>Does the echo have any pings associated with it?  I'm running 7960
>(firmware 6.3) and it works great with the exception of echo, which has
>a noise similar to a sonar ping associated with it.  It does not occur
>all the time, and is independent of whether I make the call using IAX2
>(through Voice Pulse Connect) or ZAP (PSTN).  I do have echo
>cancellation on and have not adjusted rx/tx gain. I tried adjusting it
>once with the effect, so reverted it back to what the default was.  I've
>tried just about every tweak in the sip.conf, SIPDefault.cnf and
>SIP<mac>.cnf files I've been able to come across.  I am running a single
>X100P and a TDM400P (with three modules installed).  I will be upgrading
>to a T100P and Adtran TA750 this week.
>
>Mitch Sharp
>
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