INWATS

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.

Through RCA's domestic telex network, local-call access is available in 83 cities, with InWATS service covering the rest of the country.