[cisco-voip] Echo Cancellation and 7911 Phone Loads

[Wes Sisk]

Talker echo is usually caused by echo at far end tail circuit.  With 
VOIP that delay is going to be too long for the talker's phone to 
cancel.  It will have to canceled closer to the source of the echo.

Otherwise, AFAIK, all cisco phones (except soft) have local ecan to 
prevent speaker audio from going back into mic.


http://www.voiptroubleshooter.com/problems/echo.html
http://www.cisco.com/en/US/partner/docs/ios/solutions_docs/voip_solutions/EA_ISD.html
http://www.cisco.com/en/US/partner/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml

/Wes

Jeff Ruttman wrote:
> Greetings,
>  
> Can someone confirm or deny my memory?  I recall reading that phone 
> loads for 7911 phones don't really contain echo cancellation 
> programming.  In looking now, I can't find much info on echo 
> cancellation in relation to different phone models/loads in general 
> and nothing on 7911s.
>  
> We have an office mostly full of 7911s recently complaining of talker 
> echo.  There are loads out on cisco.com newer than the ones we're 
> using, and while it's not hard to change phone loads, it would be 
> pointless to do it if the phone loads don't contain echo cancellation.
>  
> Any insight?
>  
> Thanks
> jeff
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