MicroNet Technology SP5101 - Manual (Page 58)

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(3) Digit Manipulation
- add: Add a rule to drop or insert prefix digits of incoming call.
- prefix: Set which prefix number to implement digit manipulation
rule.
- drop: Enable or disable drop function. If this function is enabled,
Phone will drop prefix number on incoming call.
- insert: Set which digit to insert.
- delete: Delete a digit manipulation rule by index.