AEL Conditionals

AEL supports if and switch statements, like AEL, but adds ifTime, and random. Unlike the original AEL, though, you do NOT need to put curly braces around a single statement in the "true" branch of an if(), the random(), or an ifTime() statement. The if(), ifTime(), and random() statements allow optional else clause.

context conditional {
  _8XXX => {
    Dial(SIP/${EXTEN});
    if ("${DIALSTATUS}" = "BUSY")
    {
      NoOp(yessir);
      Voicemail(${EXTEN},b);
    }
    else
      Voicemail(${EXTEN},u);

    ifTime (14:00-23:59|sat-sun|*|*)
      Voicemail(${EXTEN},b);
    else
    {
      Voicemail(${EXTEN},u);
      NoOp(hi, there!);
    }

    random(51) NoOp(This should appear 51% of the time);

    random(60)
    {
      NoOp(This should appear 60% of the time);
    }
    else
    {
      random(75)
      {
        NoOp(This should appear 30% of the time!);
      }
      else
      {
       NoOp( This should appear 10% of the time! );
      }
    }
  }

  _777X => {
    switch (${EXTEN}) {
      case 7771:
        NoOp(You called 7771!);
        break;
      case 7772:
        NoOp(You called 7772!);
        break;
      case 7773:
        NoOp(You called 7773!);
        // fall thru-
      pattern 777[4-9]:
        NoOp(You called 777 something!);
      default: NoOp(In the default clause!);
    }
  }
}

Note

The conditional expression in if() statements (the "${DIALSTATUS}" = "BUSY" above) is wrapped by the compiler in $[] for evaluation.

Note

Neither the switch nor case values are wrapped in $[ ]; they can be constants, or ${var} type references only.

Note

AEL generates each case as a separate extension. case clauses with no terminating 'break', or 'goto', have a goto inserted, to the next clause, which creates a 'fall thru' effect.

Note

AEL introduces the ifTime keyword/statement, which works just like the if() statement, but the expression is a time value, exactly like that used by the application GotoIfTime(). See Asterisk cmd GotoIfTime

Note

The pattern statement makes sure the new extension that is created has an '_' preceding it to make sure asterisk recognizes the extension name as a pattern.

Note

Every character enclosed by the switch expression's parenthesis are included verbatim in the labels generated. So watch out for spaces!

Note

NEW: Previous to version 0.13, the random statement used the "Random()" application, which has been deprecated. It now uses the RAND() function instead, in the GotoIf application.