LINE_ADDRESSSTATE - Telephony API Programmer's Reference

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LINE_ADDRESSSTATE

The LINE_ADDRESSSTATE message is sent when the status of an address changes on a line that is currently open by the application. The application can invoke lineGetAddressStatus to determine the current status of the address.

LINE_ADDRESSSTATE
dwDevice = (DWORD) hLine;

dwCallbackInstance = (DWORD) hCallback;

dwParam1 = (DWORD) idAddress;

dwParam2 = (DWORD) AddressState;

dwParam3 = (DWORD) 0;

Parameters
dwDevice

A handle to the line device.

dwCallbackInstance

The callback instance supplied when opening the line.

dwParam1

The address ID of the address that changed status.

dwParam2

The address state that changed. Can be a combination of these values:

LINEADDRESSSTATE_OTHER

Address-status items other than those listed below have changed. The application should check the current address status to determine which items have changed.

LINEADDRESSSTATE_DEVSPECIFIC

The device-specific item of the address status has changed.

LINEADDRESSSTATE_INUSEZERO

The address has changed to idle (it is now in use by zero stations).

LINEADDRESSSTATE_INUSEONE

The address has changed from idle or from being used by many bridged stations to being used by just one station.

LINEADDRESSSTATE_INUSEMANY

The monitored or bridged address has changed from being used by one station to being used by more than one station.

LINEADDRESSSTATE_NUMCALLS

The number of calls on the address has changed. This is the result of events such as a new inbound call, an outbound call on the address, or a call changing its hold status.

LINEADDRESSSTATE_FORWARD

The forwarding status of the address has changed, including the number of rings for determining a no answer condition. The application should check the address status to determine details about the address's current forwarding status.

LINEADDRESSSTATE_TERMINALS

The terminal settings for the address have changed.

LINEADDRESSSTATE_CAPSCHANGE

Indicates that, due to configuration changes made by the user or other circumstances, one or more of the fields in the LINEADDRESSCAPS structure for the address have changed. The application should use lineGetAddressCaps to read the updated structure. Applications which support API versions less than 0x00010004 will receive a LINEDEVSTATE_REINIT message, requiring them to shutdown and reinitialize their connection to TAPI in order to obtain the updated information.

dwParam3

Unused.

Return Values
No return value.

Remarks
The LINE_ADDRESSSTATE message is sent to any application that has opened the line device and that has enabled this message. The sending of this message for the various status items can be controlled and queried using lineGetStatusMessages and lineSetStatusMessages. By default, address status reporting is disabled.

See Also
LINEADDRESSCAPS, lineGetAddressCaps, lineGetAddressStatus, lineGetStatusMessages, lineSetStatusMessages

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