Patent ID: 7561575

Claim:
A method of handling session packets in a first intermediary node that is configured to provide network address translation (NAT) for both a header and payload of a session packet and has an inside interface coupled with a second intermediary node that is configured to perform NAT for only a header of session packets, comprising: (a) in the first intermediary node, determining whether an end node is sending session packets that are not used to set up a session and that result in a binding that was formed by the second intermediary node being retained, wherein the binding associates inside and outside addresses of the end node, wherein an end node is defined as a node that originates a session packet; and (b) in the first intermediary node, determining whether to inhibit a registration throttling process from being performed by the first intermediary node, that results in the binding being retained, based on whether it is determined that the end node is sending session packets that are not used to set up a session and that result in the binding being retained.