Supplementary Line Functions
In Win32 Telephony, supplementary
functions are functions whose form and functionality has been defined by the
API description, but which are not required in basic Telephony. They are
functions that developers of telephony applications and service providers may choose
to implement to suit the design of their custom products. That is, in contrast
to Basic Telephony functions, Supplementary Telephony functions are optional.
This section describes the Supplementary functions used with TAPI-defined line
devices. For convenience, they are grouped into general functional categories.
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