You can renumber as a block: Instead of choosing single, choose block. Do you currently have 4 digit extensions?
Also, renumbering by block goes by slot/port not by logical extension number. So, if you currently have a range of 7300-7399, but slot 1/port 1 is x7310 and your last slot/port is x7324, those are the extensions you use for first extension in the range and last extension in the range. And when it renumbers, it will renumber in order (7100-7199) so in my example the last port that was 7324 would now be 7199 (if you had 100 to renumber).
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