function allows an application to change bearer mode and/or the rate
parameters of an existing call.
| HCALL hCall,
| DWORD dwBearerMode,
| DWORD dwMinRate,
| DWORD dwMaxRate,
| LPLINEDIALPARAMS const lpDialParams
A handle to the call whose parameters are to be changed. The application must
be an owner of the call. The call state of hCall
can be any state except idle
The new bearer mode for the call. This parameter can have only a single bit
set, and it uses the following LINEBEARERMODE_ constants:
A regular 3.1 kHz analog voice-grade bearer service. Bit integrity is not
assured. Voice can support fax and modem media modes.
This corresponds to G.711 speech transmission on the call. The network may use
processing techniques such as analog transmission, echo cancellation, and
compression/decompression. Bit integrity is not assured. Speech is not intended to
support fax and modem media modes.
The multi-use mode defined by ISDN.
The unrestricted data transfer on the call. The data rate is specified
The alternate transfer of speech or unrestricted data on the same call (ISDN).
Corresponds to a non-call-associated signaling connection from the application
to the service provider or switch (treated as a media stream by the Telephony
When a call is active in LINEBEARERMODE_PASSTHROUGH, the service provider
gives direct access to the attached hardware for control by the application. This
mode is used primarily by applications desiring temporary direct control over
asynchronous modems, accessed through the Win32 comm functions, for the purpose
of configuring or using special features not otherwise supported by the service
A lower bound for the call's new data rate. The application is willing to
accept a new rate as low as this one.
An upper bound for the call's new data rate. This is the maximum data rate the
application can accept. If an exact data rate is required, dwMinRate
should be equal.
A pointer to the new dial parameters for the call, of type LINEDIALPARAMS
. This parameter can be left NULL if the call's current dialing parameters are
to be used.
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_BEARERMODEUNAVAIL, LINEERR_NOTOWNER, LINEERR_INVALBEARERMODE,
LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLHANDLE, LINEERR_OPERATIONFAILED,
LINEERR_INVALCALLSTATE, LINEERR_RATEUNAVAIL, LINEERR_INVALPOINTER,
LINEERR_RESOURCEUNAVAIL, LINEERR_INVALRATE, LINEERR_UNINITIALIZED, LINEERR_NOMEM.
This operation is used to change the parameters of an existing call. Examples
of its usage include changing the bearer mode and/or the data rate of an
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