[Asterisk-Users] Speaking of echo canceling...

[Shane Burrell]

I've seen very small echo on two boxes connected with IAX2 and SIP phones.
Polycom 500's.




-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Dave Grey
Sent: Sunday, October 30, 2005 4:46 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] Speaking of echo canceling...



Can I please get a definitive answer on this from the list...

I have read through lots of material, and I am 90% sure the answer is  
"no", but the occasional offhand statement has left this little  
nugget of hope in my mind.

Is there any echo cancelation that I can enable or add for pure  
IP<>IP calls?

I frequently get bad echo on IAX2/ulaw connections between my CVS  
HEAD and a friend's 1.2 Beta, using analog phones connected through  
IAXys on both ends. Neither PBX has a zap interface. We understand  
that this is primarily a problem with the acoustic/electric  
properties of the telephones we are using, exacerbated in conditions  
of higher latency, but is there a software canceler that I can apply  
to the problem?  Replacing the devices is not really an option.   
(Although, just for information, is there a list somewhere of  
standard telephones known to have exceptional acoustic and signal  
isolation between earpiece and mic?  He is using some Uniden cordless  
sets that are otherwise very nice and were certainly not cheap, so  
apparently price/overall apparent quality is not necessarily an  
indication of favorable de-coupling characteristics.)

Thanks for your help.

lyd
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