Extended Telephony Phone Functions

The Extended Phone Services (or Device-Specific Phone Services) include all extensions to the Telephony API defined by the service provider. TAPI defines a mechanism that enables service-provider vendors to extend TAPI using device-specific extensions. TAPI defines only the extension mechanism, and by doing so provides access to device-specific extensions. The Telephony API does not define their behavior, which is completely defined by the service provider.

TAPI consists of scalar and bit-flag data constant definitions, data structures, functions, and messages. Procedures are defined that enable a vendor to extend most of these, as described in the following topics.

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