For all telephone exchanges for the university, callers from campus phones need dial only the last five digits of any number for on-campus calls. For students changing to the new exchange, the last four digits of their phone number will remain the same. The university's 292 exchange, which serves nearly all offices on the Columbus campus, will not change. Each of the university's three exchanges for the Columbus campus has nearly 10,000 possible numbers, Patterson said. Karen Patterson, 292-9155.
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