Patent ID: 6400802
Filing Date: 2002-06-04
Classification: H04M

Abstract:
A method for measuring a certain parameter of a voice transmission line including an echo cancellation device, the voice transmission line including a terminating device and an originating device being capable of establishing a data communicative relationship by exchanging data over the voice transmission line, the echo cancellation device being capable of acquiring an enabled mode and a disabled mode, in the enabled mode the echo cancellation device performing echo cancellation on the voice transmission line, in the disabled mode the echo cancellation device being responsive to the terminating device and the originating device co-acquiring first and second signal conditions, respectively, to acquire the enabled mode, the terminating device manifesting a predetermined pattern of signal variations that includes the first signal condition, said method comprising:observing the predetermined pattern of signal variations manifested by the terminating device; establishing at the originating device the second signal condition at a point in time whereby the first and second signal conditions occur over a common time period, such that the echo cancellation device acquires the enabled mode; applying a signal to the transmission line to measure the certain parameter.