Abstract: A system and method for maintaining provisioned configuration for an endpoint in a packet switched communications network are disclosed, the communications network utilizing a signalling protocol between the endpoint and at least one gatekeeper. The gatekeeper receives a request from the endpoint, determines the addresses of an assigned gatekeeper and at least one alternate gatekeeper, and transmits the addresses to the endpoint within the signalling protocol. The endpoint sends a message to its assigned gatekeeper, and if the assigned gatekeeper is responsive, the endpoint receives an indication confirming that the Gatekeeper is available. If the assigned gatekeeper is unresponsive, the endpoint registers with an alternate gatekeeper, but periodically sends a polling status request to its assigned gatekeeper, so that when the assigned gatekeeper becomes responsive, the endpoint may then register with its assigned gatekeeper.

Abstract: Systems and methods perform analysis of ICMP packets received at a network device port to determine if the ICMP packet is valid and thus should be forwarded. One aspect of the systems and methods includes configuring a port to be a trusted port in which any type of ICMP message may be considered valid. For untrusted ports, the system analyzes the ICMP packet to determine if the packet is one that should be received on an untrusted port. A further aspect of the systems and methods includes analyzing the ICMP packet data to determine if packet addresses have been spoofed or altered.

Abstract: In some embodiments, a method for replacing an existing Differentiated Services Code point (DSCP) value with a new DSCP value, or augmenting an existing DSCP value with a new DSCP value is described. In an example embodiment, a new DSCP value is generated, added to the value field of a protocol session and transmitted to another device. The protocol session may be SIP, SDP, RTSP or some other suitable protocol. In an example embodiment, a system is described wherein a first device is operatively coupled to a second device in a peer to peer configuration, wherein communications between the first and second device is controlled by a third device.