Patent ID: 8743707

Claim:
A method comprising: instructing, by a first device, a tone generator to generate a first tone, the first tone being received by a telephone, the telephone generating a first signal that is based on the first tone; receiving, by the first device, information relating to the first signal, the first signal being transmitted to a second device, different than the first device, for processing to obtain data associated with the first signal, the data associated with the first signal being processed by a third device, different than the first device and the second device, to obtain a second signal; receiving, by the first device, information relating to the second signal; using the first device to measure a difference in time between receiving the information relating to the first signal and receiving the information relating to the second signal, using the first device to measure the difference including using the first device to determine a delay of the third device processing the data associated with the first signal to obtain the second signal, based on: information relating to the second device processing the first signal to obtain the data associated with the first signal, the information relating to the first signal, and the information relating to the second signal.