lineSetCallParams function (tapi.h)
The lineSetCallParams function allows an application to change bearer mode and/or the rate parameters of an existing call.
Syntax
LONG lineSetCallParams(
HCALL hCall,
DWORD dwBearerMode,
DWORD dwMinRate,
DWORD dwMaxRate,
LPLINEDIALPARAMS const lpDialParams
);
Parameters
hCall
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 or disconnected.
dwBearerMode
New bearer mode for the call. This parameter uses one and only one of the LINEBEARERMODE_ Constants.
dwMinRate
Lower bound for the call's new data rate. The application can accept a new rate as low as this one.
dwMaxRate
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 and dwMaxRate should be equal.
lpDialParams
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.
Return value
Returns a positive request identifier if the function is completed asynchronously, or a negative error number if an error occurs. The dwParam2 parameter of the corresponding LINE_REPLY message is zero if the function succeeds or it is a negative error number if an error occurs. 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.
Remarks
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 existing call.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | tapi.h |
| Library | Tapi32.lib |
| DLL | Tapi32.dll |