C#
The behavior depends on the current state of the call. If the call is on hold, the call is put from the hold. Otherwise – set the call on hold.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2