Patent ID: 6201854
Filing Date: 2001-03-13
Classification: H04M,H04Q

Abstract:
A method for verifying one of a plurality of telephone numbers of one of a plurality of called parties associated with a tested non-direct telephone line, the method comprising the steps of:(a) connecting to the tested non-direct telephone line;(b) dialing the one of the plurality of telephone numbers of the one of the plurality of called parties associated with the tested non-direct telephone line;(c) analyzing a received signal received from the tested non-direct telephone line, wherein said received signal relates to a signal transmitted from a central office switch to the one of the plurality of called parties; and(d) if said received signal is a ringing type signal, verifying the one of the plurality of telephone numbers,wherein said ringing type signal is a ringing signature, such that if said ringing signature is received, the one of the plurality of telephone numbers is verified, and wherein said ringing signature is a change in an impedance of the tested non-direct telephone line.