function Is used as a general extension mechanism to enable a Telephony API
implementation to provide features not described in the other TAPI functions.
The meanings of these extensions are device specific.
| HPHONE hPhone,
| LPVOID lpParams,
| DWORD dwSize
A handle to a phone device.
A pointer to a memory area used to hold a parameter block. Its interpretation
is device specific. The contents of the parameter block are passed unchanged to
or from the service provider by TAPI.
The size in bytes of the parameter block area.
Returns a positive request ID if the function will be completed asynchronously
or a negative error number if an error has occurred. The dwParam2
parameter of the corresponding PHONE_REPLY
message is zero if the function is successful or it is a negative error
number if an error has occurred. Possible return values are:
PHONEERR_INVALPHONEHANDLE, PHONEERR_NOMEM, PHONEERR_INVALPOINTER,
PHONEERR_RESOURCEUNAVAIL, PHONEERR_OPERATIONUNAVAIL, PHONEERR_UNINITIALIZED,
Additional return values are device specific.
This operation provides a generic parameter profile. The interpretation of the
parameter block is device specific. Indications and replies that are device
specific should use the PHONE_DEVSPECIFIC message.
A service provider can provide access to device-specific functions by defining
parameters for use with this operation. Applications that want to make use of
these device-specific extensions should consult the device-specific
(vendor-specific) documentation that describes which extensions are defined. Note that an
application that relies on these device-specific extensions will typically not
be portable to work with other service-provider environments.
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