INWATSInward Wide Area Telephone Service
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There are 800 INWATS numbers assigned to each terminal, for toll-free access for paging parties outside the local area.
But INWATS (800) numbers are available when needed.
The latest software-controlled, peripheral automatic-testing systems have three related components: Desktop or rack-mounted control consoles, which access the PBX in various ways; tone responders, which are accessed through dedicated tie lines or public-switched circuits; and optional trunk identification units (TIDs), which extend testing capabilities to include INWATS and direct inward dial (DID) lines.