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The K-1900-30 is an automatic dialer that dials a 1-20 digit phone number and can be programmed to call up to 4 additional phone numbers if the line is busy, or is not answered. The K-1900-30 can be used to add the smart dialing features of a Viking model E-30, to other non-dialing entry phones such as the E-10A, E-20B, E-40 series, E-50 series, E-60 series, E-70 series, E-75 series K-1500 series phones, etc.
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