[asterisk-users] Bad Echo between SIP calls

[C F]

Are the config files you are using with the phones what was meant with
that firmware? or did you upgrade the firmware and reused the old
config files?

On 6/9/07, Steve Underwood <steveu at coppice.org> wrote:
> Stephen Davies wrote:
> > On 09/06/07, Deepak Naidu <deepak_nai at yahoo.com> wrote:
> >> Ya, I have done that, below is zapata.conf.  Also we had an TMP card
> >> with
> >> analog lines. & SIP cals were great on them. & now when we switched
> >> over.
> >> SIP calls have echo.. which shouldnt be at all.
> >
> > If you are getting echo on pure SIP to SIP calls, there's no point in
> > fiddling around with your zapta.conf.  That file is for configuring
> > chan_zap, which is used to talk to Zap/ channels.  Your calls are SIP
> > to SIP so the zap channel and your PRI aren't being used at all.
> >
> > SIP calls are "pure digital" 4 wire lines so no electrical (Hybrid)
> > echo will be present.  The phones should not generate echo.  If they
> > are, they are presumably nasty phones (what kind are they?) and you
> > should get properly made phones.
> By this measure most phones are nasty. The handset should be echo
> cancelled, to prevent leakage of the earpiece into the mike. It is
> getting less and less common to do this, now. Polycoms, Sipuras, Snoms,
> you name it, they do it badly. Many are not too annoying until someone
> turns the volume up. Call someone a little hard of hearing and you will
> hear echo.
>
> Steve
>
>
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