Importance

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Abstract

A complete telephone number detection unit is described for use within a wireless local loop telephone. The detection unit examines digits or other symbols entered by user via a telephone keypad to determine whether a completed telephone number has been entered. If a completed telephone number has been entered, the detection unit signals other components of the telephone to transmit the telephone number. If the telephone number is not yet complete, then the detection unit awaits entry of additional digits or other symbols. To determine whether a completed telephone number has been entered, the detection unit accesses a parsing table having rows corresponding to different parsing states of permissible telephone numbers. Each row of the table includes a set of columns with one column corresponding to each of digits 0-9, the '*' symbol and the '#' symbol. To parse a telephone number using the table, each digit is applied to the table to yield a value. The value either provides a pointer to another row of the table or contains a value identifying that the telephone number is complete. If the value is a pointer value, then the next digit or other symbol received is employed to access the row pointed to by the pointer value. Each succeeding digit of the telephone number is employed to access the parsing table resulting in transitions from one row of the table to another until a value is read indicating a complete telephone number. Method and apparatus embodiments of the invention are described.

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First Claim