In most cases, the telephone company delivers the telephone numbers for a business to a specific location called an RJ21x or the Demarcation point. "Dmarc" for short. The RJ21x normally has an orange cover with DMARC or RJ21x written on the front. In residential areas the RJ21x is normally located in a gray box on the outside of the residence. In a business office the RJ21x is normally in an equipment closet or maintenance or electrical room.

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