[Asterisk-Users] Echo Cancellation Feature

Chris Tooley ctooley at ntrc.net
Mon Apr 26 18:12:57 MST 2004


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,




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