Before an automated attendant can route calls, you must enable the Call Transfer Out feature in the messaging software.
Enabling callers to transfer out of the messaging software has significant security implications. These implications are described under Fraudulent Transfers. If your system is administered to allow transfer by "digits," ensure that the extension you assign to your automated attendant falls within the range of allowed numbers. See Controlling Call Transfers for more information.
To enable call transfers out of messaging: