central office(redirected from Off-hook)
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|Noun||1.||central office - (usually plural) the office that serves as the administrative center of an enterprise; "many companies have their headquarters in New York"|
mukataa - an Arabic word for headquarters or administrative center; "Arafat was holed up in the mukataa of his West Bank compound"
business office, office - place of business where professional or clerical duties are performed; "he rented an office in the new building"