Support LLDP equipment will use is called Type Length Value (Type Length Value, referred to as the TLV) message to the neighbor device transmits information, this information includes frame and port, name of system, system function, system description and other properties, LLDP - MED by adding specific to the media and the IP phone and the messages exchanged between network and endpoint to realize these functions, if implemented VoIP, security is an important items to consider, because each node of VoIP is like a computer accessible, Suggestions from several aspects to ensure the security of VoIP, VoIP and separate the internal network, to meet the requirements as the prerequisite, stop using the unnecessary protocol, ensure the manageability,
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