lineSetTerminal

The lineSetTerminal function enables an application to specify which terminal information related to the specified line, address, or call is to be routed. The lineSetTerminal function can be used while calls are in progress on the line to allow an application to route these events to different devices as required.

LONG lineSetTerminal(

HLINE hLine,
DWORD dwAddressID,
HCALL hCall,
DWORD dwSelect,
DWORD dwTerminalModes,
DWORD dwTerminalID,
DWORD bEnable
);

Parameters

hLine

A handle to an open line device.

dwAddressID

An address on the given open line device.

hCall

A handle to a call. The call state of hCall can be any state, if dwSelect is CALL.

dwSelect

Specifies whether the terminal setting is requested for the line, the address, or just the specified call. If line or address is specified, events either apply to the line or address itself or serves as a default initial setting for all new calls on the line or address. This parameter 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.

dwTerminalModes

The class or classes of low-level events to be routed to the given terminal. This parameter uses the following LINETERMMODE_ constants:

LINETERMMODE_BUTTONS

The button presses from the terminal to the line.

LINETERMMODE_DISPLAY

The display events from the line to the terminal.

LINETERMMODE_LAMPS

The lamp lighting events from the line to the terminal.

LINETERMMODE_RINGER

The ring requests from the line to the terminal.

LINETERMMODE_HOOKSWITCH

The hookswitch events between the terminal and the line.

LINETERMMODE_MEDIATOLINE

This is the unidirectional media stream from the terminal to the line associated with a call on the line. Use this value when routing of both unidirectional channels of a call's media stream can be controlled independently.

LINETERMMODE_MEDIAFROMLINE

This is the unidirectional media stream from the line to the terminal associated with a call on the line. Use this value when routing of both unidirectional channels of a call's media stream can be controlled independently.

LINETERMMODE_MEDIABIDIRECT

This is the bidirectional media stream associated with a call on the line and the terminal. Use this value when routing of both unidirectional channels of a call's media stream cannot be controlled independently. Note that MEDIABIDIRECT is mutually exclusive with MEDIATOLINE and MEDIAFROMLINE

dwTerminalID

The device ID of the terminal device where the given events are to be routed. Terminal IDs are small integers in the range of 0 to one less than dwNumTerminals, where dwNumTerminals, and the terminal modes each terminal is capable of handling, are returned by lineGetDevCaps. Note that these terminal IDs have no relation to other device IDs and are defined by the service provider using device capabilities.

bEnable

If TRUE, dwTerminalID is valid and the specified event classes are routed to or from that terminal. If FALSE, these events are not routed to or from the terminal device with ID equal to dwTerminalID.

Return Values

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_INVALADDRESSID, LINEERR_NOMEM, LINEERR_INVALCALLHANDLE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLSELECT, LINEERR_OPERATIONFAILED, LINEERR_INVALLINEHANDLE, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALTERMINALID, LINEERR_UNINITIALIZED, LINEERR_INVALTERMINALMODE.

Remarks

An application can use this function to route certain classes of low-level line events to the specified terminal device or to suppress the routing of these events. For example, voice may be routed to an audio I/O device (headset); lamps and display events may be routed to the local phone device, and button events and ringer events may be suppressed altogether.

This function can be called at any time, even when a call is active on the given line device. This allows a user to switch from using the local phone set to another audio I/O device. This function may be called multiple times to route the same events to multiple terminals simultaneously. To reroute events to a different terminal, the application should first disable routing to the existing terminal and then route the events to the new terminal.

Terminal ID assignments are made by the line's service provider. Device capabilities indicate only which terminal IDs the service provider has available. Service providers that do not support this type of event routing would indicate that they have no terminal devices (dwNumTerminals in LINEDEVCAPS would be zero).

Invoking lineSetTerminal on a line or address affects all existing calls on that line or address, but does not affect calls on other addresses. It also sets the default for future calls on that line or address. A line or address that has multiple connected calls active at one time may have different routing in effect for each call.

Disabling the routing of low-level events to a terminal when these events are not currently routed to or from that terminal will not necessarily generate an error so long after the function succeeds (the specified events are not routed to or from that terminal).

TAPI routes call progress tones and messages to the same location as set by the lineSetTerminal function for "media". For example, if audio signals are going to the phone, then so will busy signals (analog) or Q.931 messages indicating busy (digital).

See Also

LINE_REPLY, LINEDEVCAPS, lineGetDevCaps

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