Patent ID: 7966406

Claim:
A method, comprising: receiving a first registration request at a home proxy, the first registration request received from a first user agent; assigning an outbound proxy set to the first user agent, the outbound proxy set comprising a plurality of outbound proxies; inserting an outbound proxy set identifier into a first registration response for the first user agent, the outbound proxy set identifier operating to allow: the first user agent to identify the plurality of outbound proxies, to select a first outbound proxy from the outbound proxy set, and to register at the first outbound proxy through a second registration request; and the first outbound proxy to assign one or more of the other outbound proxies of the outbound proxy set as one or more backup outbound proxies for the first user agent, and to inform the first user agent of the one or more backup outbound proxies through a second registration response; and receiving the second registration request at the home proxy from the first outbound proxy selected by the first user agent, the second registration request sent to the first outbound proxy by the first user agent.