Dialogic 6.2 사용자 설명서

The Bfv API Functions

November 2009

29

Hereafter each of the line states is referred to by the descriptive part 

of its name only (for example, LINE_STATE_IDLE is referred to as 
IDLE

).

The current state of the line is stored in the BTLINE structure. A 

pointer to this structure is passed as an argument to nearly all Bfv 

API entry points and is provided to the application by the 

BfvLineAttach function. 

A number of functions and interrupts serve as inputs to the BTLINE 

structure and affect the transition to different line states. Other 

functions check the current line state. 

Some functions conditionally branch to other points in the code, and 

some prevent inappropriate action from occurring, for example, 

frequent checking for CONNECTED before attempting to transmit 

data.

The following is a partial list of the functions and interrupts and the 

line state they set:

Sets the state to CONNECTED.

Initializes the state to IDLE.

Sets the state to CONNECTED or OFF_HOOK 

depending on the results from call 

progress monitoring.

Resets the state to IDLE.

Sets the state to IDLE.

Answer tone detect

Sets the state to CONNECTED.

Direction change

Sets the state to TURNAROUND.

Disconnect

Sets the state to IDLE.

Received FSK data

Sets the state to AWAIT_TRAINING.

Ring detect

Sets the state to RINGING.

Training

Sets the state to FAX_MODE.