Functions and Messages

The phoneDevSpecific function and its associated PHONE_DEVSPECIFIC message enable an application to access device-specific phone features that are unavailable through the common Telephony services for phones. In other words, phoneDevSpecific is the device-specific escape function that allows vendor-dependent extensions, and PHONE_DEVSPECIFIC is the device-specific message that is sent to the application.

The parameter profile of the phoneDevSpecific function is generic in that little interpretation of the parameters is made by the Telephony API. Rather, the interpretation of the parameters is defined by the service provider and must be understood by an application that uses them. The parameters are simply passed through by TAPI from the application to the service provider. An application that relies on device-specific extensions will usually not work with other service providers, but applications written to the common telephony phone services will work with the extended service provider.

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