1814-01: Echo Cancel [System: > VoIP: > Profile (1-4): > Echo Canceller (1814):

Use this option to enable Echo Cancellation for the selected CODEC. Echo occurs when a portion of the transmitted speech is reflected back to the caller speaking. If the reflected speech is loud enough and is audibly delayed, echo occurs. When Echo Cancellation is enabled, the system:

Waits for the duration of the Echo Tail (set in 1814-02: Echo Tail [System: VoIP: Profile (1-4): Echo Canceller (1814): Echo Tail]) for the reflected speech to be returned.
Uses built-in algorithms (mathematic formulas) to analyze the reflected speech.
Generates a waveform that effectively cancels the echo.

Although Echo Cancellation might not be required on a managed LAN, there are many sources of echo on the WAN. For example, network congestion and excessive switching (hops) can introduce delay, which will in turn cause echo if the reflected signal is loud enough. If the delays are small (e.g., 50mS), the reflected signal may be interpreted as side tone. If the delays are long (e.g., 100mS or longer), the echo can be disruptive to a normal conversation. Additionally, if the call is at some point switched onto an analog (PSTN) network, an unbalanced hybrid in that network can introduce additional echo.

Features Related to this Program

Telephone Features

VoIP Extensions

IntraMail Features

None.

Option	Description
No (0)	Disabled
Yes (1)	[Default] Enabled

1814-01: Echo Cancel [System: VoIP: Profile (1-4): Echo Canceller (1814): Echo Cancel Enable]

Features Related to this Program

Program Options