Deep Packet Inspection, including: Cisco Systems, Sonicwall, Sandvine, Check Point, Barracuda Networks, Allot Communications, Radware, Narus, ... Qosmos, Stonesoft Corporation, Volubill

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More info: Deep packet inspection (DPI) is the act of any packet network equipment which is not an endpoint of a communication using non-header content (typically the actual payload) for some purpose. This is performed as the packet passes an inspection point, searching for protocol non-compliance, viruses, spam, intrusions or predefined criteria to decide what actions to take on the packet, including collecting statistical information. There are multiple headers for IP packets, network equipment only needs to use the first of these (the IP header) for normal operation, but use of the second header (TCP, UDP etc) is normally considered to be shallow packet inspection (usually called Stateful Packet Inspection) despite this definition.