NoOp( ) Does nothing

    NoOp(text)

Does nothingthis application is simply a placeholder. As a side effect, the application evaluates text and prints the result to the Asterisk command-line interface, which can be useful for debugging.

You don't have to place quotes around the text. If quotes are placed within the brackets, they will show up on the console.

    exten => 123,1,NoOp(CallerID is ${CALLERID})