Enumeration of possible presence states of a contact.
The presence state of a contcat (or line, or appointment etc.) is a DWORD (32 Bit) bit field, where the individual Bits
are devided into two seperate spaces: the presence state (AsnPresenceStateEnum) and the presence state flags (AsnPresenceStateFlags)
which contain further deatils about the current presence state.
AsnPresenceStateEnum is an Enumeration
|eUNCONTROLLED||number||0||Presence is not available, contact is unknown.|
|eAVAILABLE||number||1||Contact is available.|
|eBUSY||number||2||Contact is busy.|
|eABSENT||number||3||Contact is absent.|
|eDONOTDISTURB||number||4||Contact wished to not being disturbed.|
|eOUTOFORDER||number||7||Something does not work, line is not connected, device is broken etc. Contact may not get into this state.|