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Assembly: Microsoft.Office.Interop.UccApi (in microsoft.office.interop.uccapi.dll)
A header field is a name-value pair separated by a colon (:) as in name:value. A value can have one or more header field parameters separated by commas. Each header field parameter also consists of a name and value separated by an equal sign (=) as in param=pValue. Header field parameters are separated from another header by semi-colons. Header fields are separated by newlines.
Win32 COM/C++ Syntax
interface IUccSignalingHeaderField : IUnknown