function enables service providers to provide access to features not offered
by other TAPI functions. The meaning of the extensions are device specific, and
taking advantage of these extensions requires the application to be fully
aware of them.
| HLINE hLine,
| DWORD dwAddressID,
| HCALL hCall,
| LPVOID lpParams,
| DWORD dwSize
A handle to a line device. This parameter is required.
An address ID on the given line device.
A handle to a call. This parameter is optional, but if it is specified, the
call it represents must belong to the hLine
line device. The call state of hCall
is device specific.
A pointer to a memory area used to hold a parameter block. The format of this
parameter block is device specific and its contents are passed by TAPI to or
from the service provider.
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 LINE_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:
LINEERR_INVALADDRESSID, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLHANDLE,
LINEERR_OPERATIONFAILED, LINEERR_INVALLINEHANDLE, LINEERR_RESOURCEUNAVAIL,
LINEERR_INVALPOINTER, LINEERR_UNINITIALIZED, LINEERR_NOMEM.
Additional return values are device specific.
This operation is part of the Extended Telephony services. It provides access
to a device-specific feature without defining its meaning. This operation is
only available if the application has successfully negotiated a device-specific
This function provides a generic parameter profile. The interpretation of the
parameter structure is device specific. Whether dwAddressID
are expected to be valid is device-specific. If specified, they must belong
. Indications and replies sent back the application that are device specific
should use the LINE_DEVSPECIFIC
A service provider can provide access to device-specific functions by defining
parameters for use with this function. Applications that want to make use of
these device-specific extensions should consult the device-specific (in this
case, vendor-specific) documentation that describes what extensions are defined.
An application that relies on these device-specific extensions will typically
not be able to work with other service provider environments.
- Software for developers
Software for Android Developers
- More information resources
Unix Manual Pages