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lineSetHSCSDState (Compact 2013)

  • Article

3/26/2014

Use the lineSetHSCSDState function to set the non-transparent High Speed Circuit Switched Data (HSCSD) configuration prior to a data call. During a call, the air interface rate and channel count can be changed.

Syntax

LONG WINAPI lineSetHSCSDState(
  HLINE hLine,
  DWORD dwChannelsIn,
  DWORD dwMaxChannelsIn,
  DWORD dwChannelCodings,
  DWORD dwAirInterfaceRate
);

Parameters

  • hLine
    The line device handle. The line device handle must have been previously obtained by a call to lineOpen with the proper TAPI device ID specified and a device-specific extension version successfully negotiated with lineNegotiateExtVersion.

  • dwChannelsIn
    Indicates the initial number of downstream radio channels in the next call.

    Note

    The number of upstream channels is determined by the network.

  • dwMaxChannelsIn
    Indicates the maximum number of downstream radio channels that will be requested in the next call. If zero, the device cannot dynamically change dwChannelsIn during the data call.
  • dwChannelCodings
    Indicates the possible per-channel speeds at which the device can communicate with the network. See the Channel Rates constants for possible values.

  • dwAirInterfaceRate
    Indicates the speed at which the device should communicate with the base station. See the lpdwAirInterfaceRate parameter of the lineGetHSCSDState function for possible values.

    Note

    Due to RLP error link correction, the request air interface rate should be higher than the desired land link rate between the landline IWF and the connection destination.

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. The following are possible return values:

  • LINEERR_INVALLINEHANDLE
  • LINEERR_NOMEM
  • LINEERR_OPERATIONUNAVAIL
  • LINEERR_OPERATIONFAILED
  • LINEERR_RESOURCEUNAVAIL
  • LINEERR_INVALPOINTER
  • LINEERR_INVALPARAM
  • LINEERR_UNINITIALIZED

Remarks

Not implemented for CDMA.

Requirements

Header

extapi.h

Library

cellcore.lib

See Also

Reference

Extended TAPI Functions
lineGetHSCSDState