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      • ▼Telephony Application Programming Interface (TAPI)
        • ▼TAPI Version 2.1
          • Legal Information
          • ▶Using the TAPI 2.1 Programmer's Reference
          • ▼Overviews
            • ▶Telephony Overview
            • ▶The Telephony Programming Model
            • ▶TAPI Applications
            • ▼Multiple-Application Programming
              • Event-Driven Environment
              • Definitions
              • Call Ownership
              • Handling Incoming Calls
              • ▶Duties of the Service Provider
              • ▼Duties of the TAPI Dynamic-Link Library
                • Only One Media Mode Bit Is Set
                • The UNKNOWN Bit Is Set
                • An Unknown Application Is Running
                • Using Media Priorities While Probing
                • No Unknown Application is Running
              • Duties of the Media Mode Application
              • ▶Receiving Incoming Calls
              • ▶Taking Ownership of a Call
              • ▶Call Handoffs
              • ▶Logging Calls
              • Deallocating a Call
              • Closing Lines
              • Learning About Existing Calls at Application Startup
              • Media Mode Updating
              • Communication Between Applications
              • ▶Special Cases in TAPI
            • ▶Call States and Events
            • ▶Supplementary Line Functions
            • ▶Line Devices Overview
            • ▶Phone Devices Overview
            • ▶Assisted Telephony Overview
            • ▶Data Structures Overview
          • ▶TAPI Reference
          • ▶TAPI Client Management
        • ▶TSPI Version 2.1
        • ▶TAPI Version 3.0
        • ▶Glossary
        • ▶Appendix
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