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The GetUserAtHost function takes a Uniform Resource Indicator (URI) string and extracts the user@hostname, if present. If a user@hostname value is not present, the function returns null.
Returns a string in the form user@hostname. Returns null if the requested data is not found or if the URI passed in is not a valid SIP URI in the form specified above. Live Communications Server 2003 applications that pass non-SIP URI strings to this function need to be modified to work properly with Office Communications Server 2007.