Keywords: asterisk

## goto, jump, and labels

This is an example of how to do a goto in AEL.

-     context gotoexample {
          s => {
      begin:
               NoOp(Infinite Loop!  yay!);
               Wait(1);
               goto begin;    // go to label in same extension
          }
          3 => {
                  goto s,begin;   // go to label in different extension
           }
           4 => {
                  goto gotoexample,s,begin;  // overkill go to label in same context
           }
      }

      context gotoexample2 {
           s =>  {
         end:
                 goto gotoexample,s,begin;   // go to label in different context
           }
      }

You can use the special label of "1" in the goto and jump statements. It means the "first" statement in the extension. I would not advise trying to use numeric labels other than "1" in goto's or jumps, nor would I advise declaring a "1" label anywhere! As a matter of fact, it would be bad form to declare a numeric label, and it might conflict with the priority numbers used internally by asterisk.

The syntax of the jump statement is: jump extension[,priority][@context] If priority is absent, it defaults to "1". If context is not present, it is assumed to be the same as that which contains the "jump".

-     context gotoexample {
          s => {
      begin:
               NoOp(Infinite Loop!  yay!);
               Wait(1);
               jump s;    // go to first extension in same extension
          }
          3 => {
                  jump s,begin;   // go to label in different extension
           }
           4 => {
                  jump s,begin@gotoexample;  // overkill go to label in same context
           }
      }

      context gotoexample2 {
           s =>  {
         end:
                 jump s@gotoexample;   // go to label in different context
           }
      }

NOTE: goto labels follow the same requirements as the Goto() application, except the last value has to be a label. If the label does not exist, you will have run-time errors. If the label exists, but in a different extension, you have to specify both the extension name and label in the goto, as in: goto s,z; if the label is in a different context, you specify context,extension,label. There is a note about using goto's in a switch statement below...

NOTE AEL introduces the special label "1", which is the beginning context number for most extensions.