[Asterisk-Users] Echo Cancellation Feature

[Chris Tooley]

I'm no longer having echo issues with any of my equipment.  The IP 500's
are good phones and I've heard nothing but good things about the Sipura
devices.  The problems I had were with snom phones.  It turned out I had
a couple of bad handsets that were giving me grief.

Chris Tooley

On Mon, 2004-04-26 at 19:19, Erik Barker wrote:
> On Thu, 2004-04-22 at 13:52, Chris Maresca wrote:
> > I've got a really cheap analog phone connected to a Sipura SIP adaptor,
> > and have zero echo problems...
> > 
> > Just static problems, but it may be related.
> > 
> > Chris.
> > 
> > On Thu, 22 Apr 2004, Brent Franks wrote:
> > 
> > > > We have three Cisco 7940 SIP phones and 1 POTS phone connected to our
> > > *
> > > > server with  TDM10B fxs card.  Our * server is connected to the pstn
> > > with
> > > > 3
> > > > X100P cards.  We have similar echo problems but only on our SIP
> > > phones.
> > > > We do not have any echo problems with the POTS phone.
> > > > 
> > > > We just purchased a Polycom IP 500 SIP phone to test but I expect
> > > similar
> > > > echo problems.
> > > > 
> > > 
> > > Don't expect the IP 500's to do anything as you stated, we are using
> > > these now and are having the problem I described earlier with these
> > > phones.
> > > 
> > > - B
> > > 
> > > 
> 
> Hmmm, that's bizarre regarding the Sipura Adapters. We too are using
> Polycom IP600s as well as Sipura Adapters (SPA2000) and find that the
> Sipuras consistently have lower (ms) times than the Polycoms:
> 
> asterisk1*CLI> sip show peers
> 
> # Polycom IP600
> 320/320          10.100.xxx.xxx  (D)  255.255.255.255  5060     OK (66 ms)
> 
> #Sipura Adapter
> 306/306          10.100.xxx.xxx  (D)  255.255.255.255  5060     OK (12 ms)
> 
> I'm not sure if this has any bearing on the echo problems noted above
> but I too am experiencing echo issues with SIP phones. However, I know
> that IP600 phones have built-in Echo Suppression as well as Echo
> Cancellation which can be enabled/disabled for the
> Handset/Headset/Speakerphone in the config files. I'm actually going to
> test this tonight as these options are disabled by default.
> 
> I would check the docs on the Polycom IP500 as well as they *should*
> have similar features as the IP600s (I don't know if this will only
> effect SIP -> SIP calls or calls placed through a PBX Zap device as
> well; Documentation is sparse on descriptions for these features).
> 
> For all the configuration options listed in the ipmid.cfg including
> Acoustic Echo Suppression/Cancellation, check out the 'SoundPoint IP SIP
> Admin Guide' located at:
> 
> http://www.polycom.com/products_services/1,1443,pw-182-3025,00.html
> 
> Regards,