lineSetCallParams

The lineSetCallParams function allows an application to change bearer mode and/or the rate parameters of an existing call.

LONG WINAPI lineSetCallParams(
  HCALL hCall,                         
  DWORD dwBearerMode,                  
  DWORD dwMinRate,                     
  DWORD dwMaxRate,                     
  LPLINEDIALPARAMS const lpDialParams  
);

Parameters

hCall

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 or disconnected.

dwBearerMode

The new bearer mode for the call. This parameter uses one and only one of the LINEBEARERMODE_ Constants.

dwMinRate

A lower bound for the call's new data rate. The application can accept a new rate as low as this one.

dwMaxRate

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 and dwMaxRate should be equal.

lpDialParams

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.

Return Values

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

  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later.
  Version: Requires TAPI 1.3 or later.
  Header: Declared in Tapi.h.
  Library: Use Tapi32.lib.

See Also

TAPI 2.2 Reference Overview, Supplementary Line Service Functions, LINE_REPLY, LINEDIALPARAMS