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[Synopsis] Executes dialplan application, always returning [Description] Usage: TryExec(appname(arguments)) Allows an arbitrary application to be invoked even when not hardcoded into the dialplan. To invoke external applications see the application System. Always returns to the dialplan. The channel variable TRYSTATUS will be set to: SUCCESS if the application returned zero FAILED if the application returned non-zero NOAPP if the application was not found or was not specified