Each subscriber and call handler in the system has a set of “caller input” rules that allow you to dictate what action Unity takes when a caller presses a digit while a greeting is playing. There are one set of caller input rules that apply to all the greetings, there are not separate rules for each greeting.
You can configure a total of 12 keys: the 0-9, * and # keys. The “fourth column” tones (A, B, C and D) are not available to be mapped as part of the “caller input” rules.