# Echo.EnableExternalPins

Determines if the echo canceller 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 canceller reference input and the echo canceller output to be switched. They appear on output stream 34 and reference stream 35.

#### See also

Echo.AutoSwitchingRefSource