lineSetMediaControl - Telephony API Programmer's Reference

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lineSetMediaControl

The lineSetMediaControl function enables and disables control actions on the media stream associated with the specified line, address, or call. Media control actions can be triggered by the detection of specified digits, media modes, custom tones, and call states.

LONG lineSetMediaControl(

HLINE hLine,
DWORD dwAddressID,
HCALL hCall,
DWORD dwSelect,
LPLINEMEDIACONTROLDIGIT const lpDigitList,
DWORD dwDigitNumEntries,
LPLINEMEDIACONTROLMEDIA const lpMediaList,
DWORD dwMediaNumEntries,
LPLINEMEDIACONTROLTONE const lpToneList,
DWORD dwToneNumEntries,
LPLINEMEDIACONTROLCALLSTATE const lpCallStateList,
DWORD dwCallStateNumEntries
);

Parameters
hLine

SAa handle to an open line device.

dwAddressID

An address on the given open line device.

hCall

A handle to a call. The application must be an owner of the call. The call state of hCall can be any state.

dwSelect

Specifies whether the media control requested is associated with a single call, is the default for all calls on an address, or is the default for all calls on a line. This parameter can only have a single flag set, and it uses the following LINECALLSELECT_ constants:

LINECALLSELECT_LINE

Selects the specified line device. The hLine parameter must be a valid line handle; hCall and dwAddressID are ignored.

LINECALLSELECT_ADDRESS

Selects the specified address on the line. Both hLine and dwAddressID must be valid; hCall is ignored.

LINECALLSELECT_CALL

Selects the specified call. hCall must be valid; hLine and dwAddressID are both ignored.

lpDigitList

A pointer to the array that contains the digits that are to trigger media control actions, of type LINEMEDIACONTROLDIGIT. Each time a digit in the digit list is detected, the specified media control action is carried out on the call's media stream.

Valid digits for pulse mode are '0' through '9'. Valid digits for DTMF mode are '0' through '9', 'A', 'B', 'C', 'D', '*', '#'.

dwDigitNumEntries

The number of entries in the lpDigitList.

lpMediaList

A pointer to an array with entries of type LINEMEDIACONTROLMEDIA. The array has dwMediaNumEntries entries. Each entry contains a media mode to be monitored, media-type specific information (such as duration), and a media control field. If a media mode in the list is detected, the corresponding media control action is performed on the call's media stream.

dwMediaNumEntries

The number of entries in lpMediaList.

lpToneList

A pointer to an array with entries of type LINEMEDIACONTROLTONE. The array has dwToneNumEntries entries. Each entry contains a description of a tone to be monitored, duration of the tone, and a media-control field. If a tone in the list is detected, the corresponding media control action is performed on the call's media stream.

dwToneNumEntries

The number of entries in lpToneList.

lpCallStateList

A pointer to an array with entries are of type LINEMEDIACONTROLCALLSTATE. The array has dwCallStateNumEntries entries. Each entry contains a call state and a media control action. Whenever the given call transitions into one of the call states in the list, the corresponding media control action is invoked.

dwCallStateNumEntries

The number of entries in lpCallStateList.

Return Values
Returns zero if the request is successful or a negative error number if an error has occurred. Possible return values are:

LINEERR_INVALADDRESSID, LINEERR_NOMEM, LINEERR_INVALCALLHANDLE, LINEERR_NOTOWNER, LINEERR_INVALCALLSELECT, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLSTATELIST, LINEERR_OPERATIONFAILED, LINEERR_INVALDIGITLIST, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALLINEHANDLE, LINEERR_UNINITIALIZED, LINEERR_INVALMEDIALIST, LINEERR_INVALPOINTER, LINEERR_INVALTONELIST.

Remarks
The lineSetMediaControl function is considered successful if media control has been correctly initiated, not when any media control has taken effect. Media control in progress is changed or is canceled by calling this function again with either different parameters or NULLs. If one or more of the parameters lpDigitList, lpMediaList, lpToneList, and lpCallStateList are NULL, then the corresponding digit, media mode, tone, or call state-triggered media control is disabled. To modify just a portion of the media control parameters while leaving the remaining settings in effect, the application should invoke lineSetMediaControl supplying the previous parameters for those portions that must remain in effect, and new parameters for those parts that are to be modified.

If hCall is selected and the call terminates or the application deallocates its handle, media control on that call is canceled.

All applications that are owners of the call are in principle allowed to make media control requests on the call. Only a single media control request can be outstanding on a call across all applications that own the call. Each time lineSetMediaControl is called, the new request overrides any media control then in effect on the call, whether set by the calling application or any other owning application.

Depending on the service provider and other activities that compete for such resources, the amount of simultaneous detections that can be made may vary over time. If service provider resources are overcommitted, the LINEERR_RESOURCEUNAVAIL error is returned.

Whether or not media control is supported by the service provider is a device capability.

See Also
LINEMEDIACONTROLCALLSTATE, LINEMEDIACONTROLDIGIT, LINEMEDIACONTROLMEDIA, LINEMEDIACONTROLTONE

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