[Asterisk-Users] Why echo occurs

[Greg Boehnlein]

On Sat, 12 Feb 2005, Steve Underwood wrote:

[ DELETED ]
> How do you control acoustic spill within a phone through the use of 
> directional microphones? Adjusting gains mitigates the issue a bit, but 
> is hardly a solution. These are just bodges, not solutions.

And just to add my two cents to the thread, the handsets themselves can 
act as sound conductors when you have a very loud and active earpiece, as 
found in the Cisco 7960. We have found that most of our clients using 
Cisco phones invariable crank the earpiece volume to 100% and then 
complain about echo issues within the first week. When we tell them to 
turn the volume down on the phone, they don't believe us until we explain 
that they are hearing the speaker being picked up by the microphone. I 
wish ALL echo issues were as easy to solve! :)

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