# Echo.EnableExternalPins

Determines if the echo canceler reference and output can be switched.

#### Syntax

Echo.EnableExternalPins = setting

#### Access

Read/Write

#### Type

String

#### Default

NO

#### Allowed values

NO | YES

#### Example

Echo.EnableExternalPins = NO

#### Details

Setting this keyword to YES enables the echo canceler reference input and the echo canceler output to be switched. They appear on output stream 70 and reference stream 71.

Note: Do not use this keyword in conjunction with hardware echo cancellation. For more information about hardware echo cancellation, refer to Configuring hardware echo cancellation.

#### See also

Echo.AutoSwitchingRefSource