The Whozz Calling? υnit captures Caller ID data and Touch Tone (DTMF) signals from as many as four telephone lines and sends them to a RS232 serial interface. The unit does not pick-up, go off-hook, or answer the telephone line. It does not affect the operation of any other devices connected to the telephone line.

The unit can be set to deliver only inbound Caller ID, ignoring all outbound dialed numbers. Or, both inbound and outbound data can be sent for complete call accounting applications. The data streams can be sent just as the call begins, just after the call ends, or both at the beginning and the end of the call. The unit can send data in two different formats of which each has two variations. Incoming calls can be blocked from passing through to the output jacks. This can be accomplished by dynamic control from the application software or by pre-loading blocked phone numbers into the unit's memory. First ring suppression to the output jack also can be performed. Setting this option prevents office employees from answering the telephone too quickly and thus inhibiting the Caller ID signal from being delivered. Finally, the unit can be set to deliver all detail information occurring on each telephone line. This includes every occurrence of Ring Signal, Off Hook, On Hook, and Hook Flash.

The Whozz Calling? unit uses setup toggles to determine how the unit will operate. The toggles are either upper or lower case and are stored in non-volatile memory. For information on unit toggles, please refer to page 3. Operating commands are used to list the setup parameters, input phone numbers in memory, and reset the system. The Send Data commands are used to set line numbers, internal clock, and phone numbers for internal blocking.

The manual is designed for the individual that prefers to quickly get the unit running and start experimenting immediately. The quick start procedure section is followed by a brief discussion of the setup toggles, commands, and data formats. Later, the manual gives a detailed explanation of all setup toggles, commands, and data formats, a discussion of Private and Out-Of-Area Caller ID types, and instructions on connecting units together.