Human factors evaluation of calling procedures for HCMTS

The Bell System's High Capacity Mobile Telecommuni­ cation System design results in some major departures from present telephone service in the mode of user operation. Under local microprocessor control, the called number is dialed into a storage register where it is held until the user places the call by an addi­ tional operation ("pre-origination dialing"). The auditory feedback typical of call placing (TOUCH-TONE calling signals, dial tone, and network signaling sounds) will be absent. The dialed-number storage register provides capability for additional service features: ability to recall the last number called without redialing ("last number repeat"), and ability to dial a number into the storage register at some unspecified time prior to actual call-placing ("scratch pad") •