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Event ID: 16436 Source: LiveCommunicationsServer

There were <value> unauthorized messages in the last <value> minutes. The last one had the FROM header: sip:<email address>.
From a newsgroup post: "When a user logs in, for the first time the request he sends to the server is not authenticated. The server sends a SIP challenge response to which the client provides the right credentials and establishes a secure connection with the server. There is currently no good way to distinguish between the first unauthenticated request sent by a regular good client and requests sent by unauthenticated rogue client trying to attack the server. This event log just says how many unauthenticated requests the server received in the last <value> minutes. In proper deployments these are benign event logs generated by regular clients. But in the case of some kind of attack, this event logs will give a hint of what is happening in the network".

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