User manual

Example: You may also use the dial plan for fallback new number. If you want to dial
9123456 with fallback new number 0123456, then you may enter 0${EXTEN:1}.
Given dialing number 9123456, ${EXTEN} represents 9123456, ${EXTEN:1} represents
123456, and 0${EXTEN:1} represents 0123456.
z Match: Yes/No
Yes indicates that old number is a prefix and the rule of new number will be applied
to generate new number for any prefix-matched number.
No indicates that old number is a number string, the rule of new number will be applied
only when the whole number string is matched.
It will display the fallback list after new configurations are submitted.
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