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echo-cancel coverage
echo-cancel coverage
4-20
To adjust the size of the echo cancel, use the echo-cancel coverage voice-port configuration
command. Use the no form of this command to reset this command to the default value.
echo-cancel coverage value
no echo-cancel coverage value
Syntax Description
value Number of milliseconds the echo-canceller will cover on a given signal. Valid
values are 16, 24, and 32.
Default
The default value for this command is 16.
Command Mode
Voice-port configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3(1)T.
Use the echo-cancel coverage command to adjust the coverage size of the echo canceller. This
command enables cancellation of voice that is sent out the interface and received back on the same
interface within the configured amount of time. If the local loop (the distance from the analog
interface to the connected equipment producing the echo) is longer, the configured value of this
command should be extended.
If you configure a longer value for this command, it will take the echo canceller longer to converge;
in this case, the user might hear slight echo when the connection is initially set up. If the configured
value for this command is too short, the user might hear some echo for the duration of the call
because the echo canceller is not cancelling the longer delay echoes.
There is no echo or echo cancellation on the IP side of the connection.
Note This command is valid only if the echo cancel feature has been enabled. For more
information, refer to the echo-cancel enable command.
Example
The following example adjusts the size of the echo canceller to 16 milliseconds:
voice-port 1/0/0
echo-cancel enable
echo-cancel coverage 16
Voice over IP for the Cisco 3600 Series Software Configuration Guide