Patent ID: 7848248

Claim:
A method for measuring a transmission delay, comprising: measuring a first roundtrip delay (RTD 1 ) by a processor at a first location between a first endpoint and a second endpoint over a first communication network; measuring a second roundtrip delay (RTD 2 ) at the first location between a third endpoint and a fourth endpoint over a second communication network with symmetric delay characteristics; and performing synchronous recordings of a test signal that is sent simultaneously from the second endpoint to the first endpoint and from the fourth endpoint to the third endpoint, to measure an arrival time (t 1 ) of the test signal over the first communication network, and, an arrival time (t 2 ) of the test signal over the second communication network t 2 , where the first roundtrip delay, the second roundtrip delay and the arrival times (t 1 ) and (t 2 ) are used to calculate an one way transmission delay in the first communication network.