[Asterisk-Users] echo in Snom 360 phones

[Steve Davies]

On 5/3/06, Dr. Michael J. Chudobiak <mjc at avtechpulse.com> wrote:
>
> One of my users reports frequently hearing echo on her Snom 360 phone,
> even while talking to other Snom phones (via Asterisk) on the same LAN
> (i.e., all-digital low-latency connection). I can never reproduce it
> though, and swapping the phone didn't help.
>
> Has anyone else seen "mystery echo" on Snom phones? Any suggestions for
> debugging?
>
> On my own Snom 360, I sometimes hear an echo for the first second or
> two, and then it goes away. I guess an echo cancellation circuit kicks
> in, inside the Snom.

We use snoms is a number of locations, and occasionally hear reports
of echo from users making internal SIP to SIP calls. I believe that
some of the older (much older) versions of the snom firmware were
quite poor at "echo prevention", so the remote handset may be the
issue. Remember that echo is almost always caused by the "far-end" and
not the person hearing it.

We use the 4.5 firmware on snom320/snom360 phones, and 3.60x firmware
on snom190 phones with good results. There is also the possibility
that the microphone volume on the snom360 is set too high. 4 or 5 is
about normal.

Cheers,
Steve