Abstract: A method and system for internal data loop back in a packet switch is provided. In some instances, the switch may be required to process multiple layers of a header within the data packet, such as when data is transferred over the network encapsulated with a TCP header at the Transport Layer to form a TCP packet, then encapsulated with an IP header at the Network Layer to form an IP packet, then encapsulated with one or more MPLS headers to form a MPLS packet, and then encapsulated with an Ethernet header at the Link Layer to form an Ethernet packet. In such an instance, the data packet can be iteratively processed by the packet switch using an internal loop back technique. An internal loop back may be accomplished by using a header providing internal routing instructions resulting in the data packet being routed directly from an egress queue back to an ingress queue whereupon the lower levels of the header can be processed.

Abstract: A system and methods are shown for selecting a packet data serving node (PDSN) for a mobile node in a mobile Internet Protocol network. One method includes responsively to receiving on a first foreign agent control node (FACN) from a radio node a registration request message and determining that a mobile profile associated with a mobile node specified in the registration request is not available at the first FACN, sending from the first FACN to a second FACN a query request message including a request for the mobile profile. If the second FACN includes the requested mobile profile, the second FACN sends it to the first FACN using a query response message. When the first FACN receives the query response message, the first FACN makes a determination that the mobile profile includes a network address of the last serving PDSN.

Abstract: A mobile node may roam away from its home network to a foreign network. The mobile node may communicate using the Mobile Internet Protocol, and it may use Internet Protocol security to communicate with its home network. A foreign agent on the foreign network and a home agent on the home network may dynamically link a policy to be used for a Internet Protocol security session between the foreign agent and the home agent. The foreign agent and the home agent may dynamically create a filter to be used for the Internet Protocol Security session.

Abstract: In mobile IP wireless data networking, methods are described for correctly routing packets through a foreign agent to or from wireless nodes where the wireless nodes have the same home network IP address. Instead of using normal IP routing, the foreign agent uniquely identifies the wireless node's home network IP address and home agent IP address with a PPP link address associated with a PPP link between the foreign agent and the wireless node. This association between PPP link addresses, home agent IP addresses, and home network IP addresses, is preferably implemented in software as a table stored in the foreign agent. The routing of packets through the foreign agent to the mobile nodes is performed by reference to the table. The table allows the foreign agent to correctly and efficiently route packets in the situation where multiple wireless nodes are registered with the foreign agent, but more than one of the wireless nodes have the same home network IP address.

Abstract: A system and method for communicating data between a user connected to a subscriber line and a data network comprising a first module connected to the subscriber line and a second module, physically separate from the first module, connected to the data network. The first module includes a signal converter for converting analog signals received from the subscriber line to a digital signal for sending over an interconnection path to the second module. The second module includes a modulator/demodulator for converting the digital signal to data packets. The first module may be pooled with M first modules and connected over a shared interconnection path to N second modules. The interconnection path may be concentrated to permit communication of signals from those first and second modules communicating user data at any given time.

Abstract: A system for increasing call capacity of an internet telephony system in an emergency mode, such as where there is a surge of call requests in a particular region. A management system in the internet telephony system may detect the presence of an actual or potential state of congestion of call traffic and/or signaling traffic. In order to admit a higher rate of call traffic to the telephony system, action is taken to reduce the workload of the signaling system, in order to allow the telephony system to focus more on serving call requests. For example, the signaling system may reduce the rate of signaling request messages processed with respect to requested and ongoing calls and/or reduce the amount of processing involved in handling such messages.