default or selected kernelversion does not have config value CONFIG_ECHO.
Result is shown for kernelversion 6.9.9
Line Echo Canceller support
modulename: echo.ko
configname: CONFIG_ECHO
Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>Line Echo Canceller support
In linux kernel since version 2.6.28 (release Date: 2008-12-24)
This driver provides line echo cancelling support for mISDN and
Zaptel drivers.
To compile this driver as a module, choose M here. The module
will be called echo.
Zaptel drivers.
To compile this driver as a module, choose M here. The module
will be called echo.