• 5.7.1. DX_CST Overview
• 5.7.2. DX_CST Definition
• 5.7.3. DX_CST Parameters

5.7. DX_CST: Call Status Transition

The DX_CST data structure contains parameters for Call Status Transition.

5.7.1. DX_CST Overview

DX_CST contains call status transition information after an asynchronous TDX_CST termination or TDX_SETHOOK event occurs. Use the Event Management function, sr_getevtdatap( ) to retrieve the structure.

5.7.2. DX_CST Definition

The typedef for the structure is as follows:

    typedef struct DX_CST {

       unsigned short cst_event;

       unsigned short cst_data;

    } DX_CST;




5.7.3. DX_CST Parameters

Parameter	Description
cst_event	Contains the event type. Use the following defines to identify the event type:
	Event Type	Description
	DE_DIGITS	digit received
	DE_LCOFF	loop current off
	DE_LCON	loop current on
	DE_LCREV	loop current reversal
	DE_RINGS	rings received
	DE_RNGOFF	caller hang up event (incoming call is dropped before being accepted)
	DE_SILOFF	non-silence detected
	DE_SILON	silence detected
	DE_TONEOFF	tone off event
	DE_TONEON	tone on event
	DE_WINK	received a wink
	DX_OFFHOOK	offhook event
	DX_ONHOOK	onhook event
	DX_ONHOOK and DX_OFFHOOK are returned if a TDX_SETHOOK termination event is received.
cst_data	Contains data associated with the CST event. The data are described for each event type as follows:
	Event Type	Event Data
	DE_DIGITS	ASCII digit (low byte) and the digit type (high byte)
	DE_LCOFF	time previous last loop current on transition in 10 ms units
	DE_LCON	time since previous loop current off transition in 10 ms units
	DE_LCREV	time since previous loop current reversal transition in 10 ms units
	DE_RINGS	0
	DE_SILOFF	time since previous silence started in 10 ms units
	DE_SILON	time since previous silence stopped in 10 ms units
	DE_TONEOFF	user-specified tone ID
	DE_TONEON	user-specified tone ID
	DE_WINK	N/A
	DX_OFFHOOK	N/A
	DX_ONHOOK	N/A

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