If expression is true, executes the given application with arguments as its arguments, and returns the result. For more information on Asterisk expressions, see Chapter 6, More Dialplan Concepts or the channelvariables.txt file in the doc/ subdirectory of the Asterisk source.

If expression is false, execution continues at the next priority.

exten => 123,1,ExecIf($[ ${CALLERIDNUM} = 101 ],SayDigits,12345)
exten => 123,2,SayDigits(6789)

See Also

The EVAL, Exec(), TryExec()