LINECALLSTATUS

The LINECALLSTATUS structure describes the current status of a call. The information in this structure, as returned with lineGetCallStatus, depends on the device capabilities of the address, the ownership of the call by the invoking application, and the current state of the call being queried.

typedef struct linecallstatus_tag {

DWORD dwTotalSize;

DWORD dwNeededSize;

DWORD dwUsedSize;

DWORD dwCallState;

DWORD dwCallStateMode;

DWORD dwCallPrivilege;

DWORD dwCallFeatures;

DWORD dwDevSpecificSize;

DWORD dwDevSpecificOffset;

DWORD dwCallFeatures2;

SYSTEMTIME tStateEntryTime;

} LINECALLSTATUS, FAR *LPLINECALLSTATUS;

Members
dwTotalSize

The total size in bytes allocated to this data structure.

dwNeededSize

The size in bytes for this data structure that is needed to hold all the returned information.

dwUsedSize

The size in bytes of the portion of this data structure that contains useful information.

dwCallState

dwCallStateMode

The dwCallState field specifies the current call state of the call. The interpretation of the dwCallStateMode field is call-state-dependent. It specifies the current mode of the call while in its current state (if that state defines a mode). This field uses the following LINECALLSTATE_ constants:

LINECALLSTATE_IDLE

The call state mode is unused.

LINECALLSTATE_OFFERING

The call state mode is of type LINEOFFERINGMODE_. Values are:

LINEOFFERINGMODE_ACTIVE

Indicates that the call is alerting at the current station (will be accompanied by LINEDEVSTATE_RINGING messages), and if any application is set up to automatically answer, it may do so.

LINEOFFERINGMODE_INACTIVE

Indicates that the call is being offered at more than one station, but the current station is not alerting (for example, it may be an attendant station where the offering status is advisory, such as blinking a light).

LINECALLSTATE_ACCEPTED

The call state mode is unused.

LINECALLSTATE_DIALTONE

The call state mode, of type LINEDIALTONEMODE_. Values are:

LINEDIALTONEMODE_NORMAL

This is a "normal" dial tone, which typically is a continuous tone.

LINEDIALTONEMODE_SPECIAL

This is a special dial tone indicating a certain condition is currently in effect.

LINEDIALTONEMODE_INTERNAL

This an internal dial tone, as within a PBX.

LINEDIALTONEMODE_EXTERNAL

This is an external (public network) dial tone.

LINEDIALTONEMODE_UNKNOWN

The dial tone mode is not currently known but may become known later.

LINEDIALTONEMODE_UNAVAIL

The dial tone mode is unavailable and will not become known.

LINECALLSTATE_DIALING

Call state mode is unused.

LINECALLSTATE_RINGBACK

Call state mode is unused.

LINECALLSTATE_BUSY

The call state mode is of type LINEBUSYMODE_. Values are:

LINEBUSYMODE_STATION

The busy signal indicates that the called party's station is busy. This is usually signaled with a "normal" busy tone.

LINEBUSYMODE_TRUNK

The busy signal indicates that a trunk or circuit is busy. This is usually signaled with a "long" busy tone.

LINEBUSYMODE_UNKNOWN

The busy signal's specific mode is currently unknown but may become known later.

LINEBUSYMODE_UNAVAIL

The busy signal's specific mode is unavailable and will not become known.

LINECALLSTATE_SPECIALINFO

The call state mode is of type LINESPECIALINFO_. Values are:

LINESPECIALINFO_NOCIRCUIT

This special information tone precedes a no circuit or emergency announcement (trunk blockage category).

LINESPECIALINFO_CUSTIRREG

This special information tone precedes a vacant number, AIS, Centrex number change and nonworking station, access code not dialed or dialed in error, or manual intercept operator message (customer irregularity category).

LINESPECIALINFO_REORDER

This special information tone precedes a reorder announcement (equipment irregularity category).

LINESPECIALINFO_UNKNOWN

Specifics about the special information tone are currently unknown but may become known later.

LINESPECIALINFO_UNAVAIL

Specifics about the special information tone are unavailable and will not become known.

LINECALLSTATE_CONNECTED

Call state mode is of type LINECONNECTEDMODE_. Values are:

LINECONNECTEDMODE_ACTIVE

Indicates that the call is connected at the current station (the current station is a participant in the call).

LINECONNECTEDMODE_INACTIVE

Indicates that the call is active at one or more other stations, but the current station is not a participant in the call.

LINECALLSTATE_PROCEEDING

Call state mode is unused.

LINECALLSTATE_ONHOLD

Call state mode is unused.

LINECALLSTATE_CONFERENCED

Call state mode is unused.

LINECALLSTATE_ONHOLDPENDCONF

Call state mode is unused.

LINECALLSTATE_ONHOLDPENDTRANSF

Call state mode is unused.

LINECALLSTATE_DISCONNECTED

Call state mode is of type LINEDISCONNECTMODE_. Values are:

LINEDISCONNECTMODE_NORMAL

This is a "normal" disconnect request by the remote party. The call was terminated normally.

LINEDISCONNECTMODE_UNKNOWN

The reason for the disconnect request is unknown.

LINEDISCONNECTMODE_REJECT

The remote user has rejected the call.

LINEDISCONNECTMODE_PICKUP

The call was picked up from elsewhere.

LINEDISCONNECTMODE_FORWARDED

The call was forwarded by the switch.

LINEDISCONNECTMODE_BUSY

The remote user's station is busy.

LINEDISCONNECTMODE_NOANSWER

The remote user's station does not answer.

LINEDISCONNECTMODE_NODIALTONE

A dial tone was not detected within a service-provider defined timeout, at a point during dialing when one was expected (such as at a "W" in the dialable string). This can also occur without a service-provider-defined timeout period or without a value specified in the dwWaitForDialTone member of the LINEDIALPARAMS structure.

LINEDISCONNECTMODE_BADADDRESS

The destination address in invalid.

LINEDISCONNECTMODE_UNREACHABLE

The remote user could not be reached.

LINEDISCONNECTMODE_CONGESTION

The network is congested.

LINEDISCONNECTMODE_INCOMPATIBLE

The remote user's station equipment is incompatible with the type of call requested.

LINEDISCONNECTMODE_UNAVAIL

The reason for the disconnect is unavailable and will not become known later.

LINECALLSTATE_UNKNOWN

Call state mode is unused.

dwCallPrivilege

The application's privilege for this call. This field uses the following LINECALLPRIVILEGE_ constants. Values are:

LINECALLPRIVILEGE_MONITOR

The application has monitor privilege.

LINECALLPRIVILEGE_OWNER

The application has owner privilege.

dwCallFeatures

These flags indicate which Telephony API functions can be invoked on the call, given the availability of the feature in the device capabilities, the current call state, and call ownership of the invoking application. A zero indicates the corresponding feature cannot be invoked by the application on the call in its current state; a one indicates the feature can be invoked. This field uses LINECALLFEATURE_ constants.

dwDevSpecificSize

dwDevSpecificOffset

The size in bytes of the variably sized device-specific field, and the offset in bytes from the beginning of this data structure.

dwCallFeatures2

Indicates additional functions can be invoked on the call, given the availability of the feature in the device capabilities, the current call state, and call ownership of the invoking application. An extension of the dwCallFeatures field. This field uses LINECALLFEATURE2_ constants.

tStateEntryTime

The Coordinated Universal Time at which the current call state was entered.

Remarks
Device-specific extensions should use the DevSpecific (dwDevSpecificSize and dwDevSpecificOffset) variably sized area of this data structure.

The application is sent a LINE_CALLSTATE message whenever the call state of a call changes. This message only provides the new call state of the call. Additional status about a call is available with lineGetCallStatus.

The members dwCallFeatures2 and tStateEntryTime are available only to applications that open the line device with an API version of 0x00020000 or greater.

See Also
LINE_CALLSTATE, LINEDIALPARAMS, lineGetCallStatus

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