Patent ID: 6301353
Filing Date: 2001-10-09
Classification: H04Q

Abstract:
In a PABX switching system, a method of establishing a communication route from dialed digits comprising:(a) receiving an out of PABX digit,(b) receiving seven or ten dialed digits relating to a call,(c) storing a table of groups of three initial digits after the out of PABX digit and for each group of three initial digits storing a subtable, each subtable being comprised of a list of four or seven digits expected to follow a corresponding group of initial digits, each quantity being correlated with a communication route, each list of quantities of digits being sorted in ascending order,(d) selecting a group of initial digits in the table corresponding to first three digits of said dialed digits, and pointing to a communication route corresponding to four digits in a subtable of selective group of initial digits,(e) using said communication route for completion of said call in the event the dialed digits contain four digits,(f) detecting a dialed digit in excess of four digits and pointing instead to a next highest quantity of digits in said subtable of the selected group of initial digits,(g) repeating step (f) until no dialed digit is detected which is in excess of a highest quantity of digits pointed to and using a corresponding communication route listed in the subtable for completion of said call.