TSPIMessage
TSPIMessage is an enumeration type that defines the set of additional LINEEVENT and PHONEEVENT functions appearing in TSPI that do not appear in TAPI.
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TSPI_MESSAGE_BASE
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The lowest number in the range of TSPI-specific message values. This value has no meaning by itself, but serves as a base for defining the other values.
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LINE_NEWCALL
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Specifies that a new, incoming call has arrived and introduces it to TAPI. This must be the first message sent to TAPI for a new incoming call. TAPI returns its opaque identifier for the call as part of its handling of this message.
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LINE_CALLDEVSPECIFIC
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Specifies that a device-specific event has occurred on a call device.
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LINE_CALLDEVSPECIFICFEATURE
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Specifies that a device-specific feature event has occurred on a call device.