LINEMEDIACONTROLCALLSTATE - Telephony API Programmer's Reference

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LINEMEDIACONTROLCALLSTATE

The LINEMEDIACONTROLCALLSTATE structure describes a media action to be executed when detecting transitions into one or more call states.

typedef struct linemediacontrolcallstate_tag {

DWORD dwCallStates;

DWORD dwMediaControl;

} LINEMEDIACONTROLCALLSTATE, FAR *LPLINEMEDIACONTROLCALLSTATE;

Members
dwCallStates

Specifies one or more call states. This field uses the following LINECALLSTATE_ constants:

LINECALLSTATE_IDLE

The call is idle

no call exists.

LINECALLSTATE_OFFERING

The call is being offered to the station, signaling the arrival of a new call. In some environments, a call in the offering state does not automatically alert the user. Alerting is done by the switch instructing the line to ring, and it does not affect any call states.

LINECALLSTATE_ACCEPTED

The call was offering and has been accepted. This indicates to other (monitoring) applications that the current owner application has claimed responsibility for answering the call. In ISDN, this also initiates alerting to both parties.

LINECALLSTATE_DIALTONE

The call is receiving a dial tone from the switch, which means that the switch is ready to receive a dialed number.

LINECALLSTATE_DIALING

Destination address information (a phone number) is being sent to the switch over the call. Note that the operation lineGenerateDigits does not place the line into the dialing state.

LINECALLSTATE_RINGBACK

The call is receiving ringback from the called address. Ringback indicates that the other station has been reached and is being alerted.

LINECALLSTATE_BUSY

The call is receiving a busy tone. Busy tone indicates that the call cannot be completed because either a circuit (trunk) or the remote party's station are in use.

LINECALLSTATE_SPECIALINFO

Special information is sent by the network. Special information is typically sent when the destination cannot be reached.

LINECALLSTATE_CONNECTED

The call has been established, and the connection is made. Information is able to flow over the call between the originating address and the destination address.

LINECALLSTATE_PROCEEDING

Dialing has completed and the call is proceeding through the switch or telephone network.

LINECALLSTATE_ONHOLD

The call is on hold by the switch.

LINECALLSTATE_CONFERENCED

The call is currently a member of a multiparty conference call.

LINECALLSTATE_ONHOLDPENDCONF

The call is currently on hold while it is being added to a conference.

LINECALLSTATE_ONHOLDPENDTRANSF

The call is currently on hold awaiting transfer to another number.

LINECALLSTATE_DISCONNECTED

The remote party has disconnected from the call.

LINECALLSTATE_UNKNOWN

The state of the call is not known. This may be due to limitations of the call-progress detection implementation.

dwMediaControl

The media-control action. This field uses the following LINEMEDIACONTROL_ constants:

LINEMEDIACONTROL_NONE

No change is to be made to the media stream.

LINEMEDIACONTROL_RESET

Reset the media stream. Equivalent to an end-of-input. All buffers are released.

LINEMEDIACONTROL_PAUSE

Temporarily pause the media stream.

LINEMEDIACONTROL_RESUME

Start or resume a paused media stream.

LINEMEDIACONTROL_RATEUP

The speed of the media stream is increased by some stream-defined quantity.

LINEMEDIACONTROL_RATEDOWN

The speed of the media stream is decreased by some stream-defined quantity.

LINEMEDIACONTROL_RATENORMAL

The speed of the media stream is returned to normal.

LINEMEDIACONTROL_VOLUMEUP

The amplitude of the media stream is increased by some stream-defined quantity.

LINEMEDIACONTROL_VOLUMEDOWN

The amplitude of the media stream is decreased by some stream-defined quantity.

LINEMEDIACONTROL_VOLUMENORMAL

The amplitude of the media stream is returned to normal.

Remarks
No extensions.

The LINEMEDIACONTROLCALLSTATE structure defines a triple <call state(s), media-control action>. An array of these triples is passed to the lineSetMediaControl function to set the media-control actions triggered by the transition to the call state of the given call. When a transition to a listed call state is detected, the corresponding action on the media stream is invoked.

See Also
lineGenerateDigits, lineSetMediaControl

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