US Patent No. 9,357,373

METHOD AND SYSTEM FOR IP MULTIMEDIA BEARER PATH OPTIMIZATION THROUGH A SUCCESSION OF BORDER GATEWAYS


Patent No. 9,357,373
Issue Date May 31, 2016
Title Method And System For Ip Multimedia Bearer Path Optimization Through A Succession Of Border Gateways
Inventorship Richard P. Ejzak, Wheaton, IL (US)
Assignee Alcatel Lucent, Boulogne-Billancourt (FR)

Claim of US Patent No. 9,357,373

1. A method for identifying alternative end-to-end media paths through internet protocol realms using substitute session description
protocol parameters, the method comprising:
receiving a first message for establishing or changing a session, including a list of internet protocol realms, wherein the
list includes a previously traversed through internet protocol realm on a first media path and a secondary internet protocol
realm that is not on the first media path, is accessible from a controlled gateway and has not been previously traversed through;

determining the outgoing internet protocol realm for a second media path based at least in part on session initiation protocol
signaling information;

if the outgoing internet protocol realm is reachable from the secondary internet protocol realm on the list of internet protocol
realms, selecting the secondary realm and bypassing at least one border gateway associated with the secondary internet protocol
realm,

wherein the session description protocol parameters are in an offer message and the method further comprises:
receiving a session description protocol answer with session description protocol parameters;
recalling the session description protocol parameter in the offer message; and
manipulating the session description protocol parameters in the session description protocol answer in order to establish
an end-to-end media path that bypasses one or more border gateways.