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MSDN Library
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Telephony API

Windows Mobile 6.5
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The Telephony API implementation is a subset of the Microsoft Telephony Application Programming Interface (TAPI) version 2.0 and some parts of TAPI version 2.1. TAPI provides an application programming interface (API) that simplifies and abstracts the details of making telephony connections between two or more devices. TAPI abstracts call-control functionality to allow different, and seemingly incompatible, communication protocols to expose a common interface to applications through its support of telephony service providers (TSPs).

For Windows Mobile devices, attempting to make cellular connections directly through TAPI is not supported Cellular connections should be made through Connection Manager.

TAPI Application Development

Provides an overview of the architecture of TAPI 2.0. Provides a detailed description of line devices and phone devices. Shows how to use the TAPI application programming interface to establish a modem connection. Provides a comprehensive overview of the Telephony Services Provider Interface (TSPI) support in Windows Embedded CE.

TAPI Registry Settings

Provides a list of the configurable registry settings for TAPI.

TAPI Security

Provides security-related information for TAPI.

TAPI Migration

Provides information about issues to consider when migrating to a newer version of Windows Mobile.

TAPI Reference

Provides information on programming elements available for TAPI.

TSPI Reference

Provides information on programming elements available for TSPI.

Unimodem Registry Settings

Provides a list of the configurable registry settings for Unimodem.

Unimodem OS Design Development

Describes how OEMs can add and integrate Unimodem into their OS designs.

Editing the Device Configuration

Provides information about editing the device configuration using the lineDevSpecific function extensions.


Describes CellCore which provides a basic set of wireless connection oriented services.

Connection Manager

Describes how to enable customization of dialing sequences.


Provides information on the phone APIs.

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