Specifications

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Cisco 1751 Router Software Configuration Guide
OL-1070-01
Usage Guidelines
The echo-cancel command enables cancellation of voice that is sent out of the interface and is received
back on the same interface. Disabling echo cancellation might cause the remote side of a connection to
hear an echo. Because echo cancellation is an invasive process that can minimally degrade voice quality,
this command should be disabled if it is not needed.
The echo-cancel command does not affect the echo heard by the user on the analog side of the
connection.
There is no echo path for a four-wire E&M interface. The echo canceller should be disabled for that
interface type.
Note This command is valid only if the echo-cancel coverage command has been configured.
For more information, refer to the echo-cancel coverage command.
Example
The following example enables the echo cancel feature for 16-millisecond echo coverage:
voice port 0/0
echo-cancel enable
echo-cancel coverage 16
Related Commands
echo-cancel coverage
non-linear
expect-factor
To specify when the router generates an alarm to the network manager, indicating that the expected
quality of voice has dropped, use the expect-factor dial-peer configuration command. Use the no form
of this command to reset the default value for this command.
expect-factor value
no expect-factor value
Syntax Description
Default
10.
Command Mode
Dial-peer configuration.
value Integers that represent the ITU-T specification for quality of voice as
described in G.113. Valid entries are from 0 to 20, with 0 representing
toll quality.