Echo Cancellation In the BaseStation’s Tech Menu is a selection for “Echo Cancellation” (ECAN).  This refers to software that assists in removing echo  from 2-Wire intercom connections. Hardware connections need to be optimized with the auto-null procedure to minimize echo in the physical link so that the ECAN software can remove any residual echo. In the Tech menu, “Echo Cancellation” is “ON” by default, but is only enabled for channels that are selected for operation with a 2-Wire intercom and have a physical connection to a 2-Wire system.  
Note - ECAN is disabled while the BaseStation’s Auto-Null or Manual Null menu screens are active, to ensure that the hardware is optimized for echo reduction. 
Test for EchoTalk into the wireless system for at least 10 seconds to test for echo.When ECAN is first enabled, it requires up to 10 seconds for it to achieve convergence. There will usually be some noticeable echo during the first few seconds of testing, but it will diminish over time as the ECAN software converges to an inaudible level. Brief loud talking speech can help accelerate efficiency.