[asterisk-users] Bad Echo between SIP calls

[C F]

It doesn't matter if it's supported, they are all, however I have seen some
echo problems after firmware upgrades, the only way to fix it was to either
copy the differences or overwrite my old config files with the new ones that
came with the firmware and then modify as needed for my setup.

On 6/10/07, Deepak Naidu <deepak_nai at yahoo.com> wrote:
>
> The sip config & firmware are the supported one for the existing
> firmware.  If you have any stable working Polycom 501 SIP without echo
> between SIP-->SIP & wouldnt mind to share the sip.cfg, sip.ld & bootrom
> would be great, bcos I have not got concreate resolution for this issue.
>
> Hope I can resolve this mess.  Feels bad when one does best in aggregating
> things & some louzy device screws up... Oh my frustation is comming on mail
> :
>
>
> --
> Deepak
>
> *C F <shmaltz at gmail.com>* wrote:
>
> 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 wrote:
> > Stephen Davies wrote:
> > > On 09/06/07, Deepak Naidu 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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