TryExec() — Tries to execute an Asterisk application
Attempts to run the specified Asterisk application.
This application is very similar to the Exec()
application, except that it always
returns normally, whereas the Exec()
application will act as if the underlying application was natively
called, including exit status. This application can be used to catch a
condition that would normally cause the underlying application to exit
abnormally.
exten => 123,1,TryExec(VMAuthenticate(@default))