Patent ID: 7263095

Claim:
A method of determining quality of service of a network session between a calling device and a called device that convey information over at least two independent IP networks, said method comprising: sending a message from the calling device to a first IP network of said at least two independent IP networks, said message including a desired quality parameter and an accumulated delay parameter, receiving the message at the first network, modifying the accumulated delay parameter with a first delay between the calling device and the first network, sending the message to a second IP network of said at least two independent networks, secondly modifying the accumulated delay parameter with a second delay between the first and second IP networks, sending the message to the called device, thirdly modifying the accumulated delay parameter with a third delay between the second IP network and the called device, and determining, based on values of the accumulated delay parameter and the desired quality parameter, whether quality of service is met for said network session.