R: [Asterisk-Users] Echo cancellation

[Kevin P. Fleming]

Steve Davies wrote:
> Use 'zap show channel ...' on the channel where the call is in
> progress, and it should show that EC is enabled.

Except that currently it does _not_ reflect when the EC has been
disabled due to the receipt of the CED tone (sent by a FAX or modem).
Basically, it reflects that EC was requested on the channel when the
call was set up, but not that it is currently active.