Configuring Echo Cancellation On The Voice Feature Card - Cisco VGD-1T3 Software Configuration Manual

Configuring Voice over IP
Table 7
Dial-Peer Tag Extension
3
4

Configuring Echo Cancellation on the Voice Feature Card

The echo-cancel enable command enables cancellation of voice that is sent out the interface and
received back on the same interface; sound that is received back in this manner is perceived by the
listener as an echo. 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.
For the voice feature card, software echo cancellation is the default configuration—G.168-compliant
echo cancellation is enabled by default with a coverage of 64 milliseconds. Hardware echo cancellation
is not available.
Command or Action
Step 1
enable
Example:
Router> enable
Step 2
configure terminal
Example:
Router# configure terminal
Step 3
voice-port slot/port:channel
Example:
Router(config)# voice-port 2/0:1
Step 4
echo-cancel enable
Example:
Router(config-voiceport)# echo-cancel
enable
Step 5
echo-cancel coverage {24 | 32 | 48 | 64 |80
| 96 | 112 | 128}
Example:
Router (config-voiceport)# echo-cancel
coverage 96
Step 6
exit
Example:
Router(config-voiceport)# exit
Dial-Peer Configuration Table
Destination
Pattern
— 5...
6000 6000
Cisco VGD 1T3 Voice Gateway Software Configuration Guide
Type Voice Port Session Target Codec
voip — 172.19.1.1
pots 1/0:3 —
Purpose
Enables privileged EXEC mode.
• Enter your password if prompted.
Enters global configuration mode.
Enters voice-port configuration mode and
identifies a slot, port, and channel for
configuration parameters.
Enables the cancellation of voice that is sent out
the interface and received back on the same
interface.
Adjusts the echo canceller by the specified number
of milliseconds.
The default is 128.
•
Exits voice-port configuration mode and returns to
global configuration mode.
Configuring Basic VoIP
QoS
6.711 best effort
— —
101