Dialogic 6.2 Manuale Utente

The Bfv API Functions

November 2009

36

Call control functions enable the application to set up, initiate, 

connect, disconnect, and perform other tasks related to the telephone 

network. Three forms of call control are available: Bfv high-level and 

low-level and BSMI-level.

High-level Bfv call control functions simplify the process of accessing 

the telephone system. Some of the high-level functions call the 

low-level Bfv call control functions to automatically perform the 

low-level tasks. However, the high-level functions trade flexibility 

and control for ease of programming.

With the Bfv low-level call control functions, you can perform T1 

robbed bit, T1/E1 PRI, or QSIG, analog, and BRI call control 

functionality. See Volume 2 of the Bfv API Reference Manual for the 

descriptions of the Bfv call control functions.

The BSMI-level call control functions are used to facilitate 

communications directly between the Brooktrout module and the 

telephony lines. These are the Bfv API Boston Simple Message 

Interface (BSMI) functions that use messages to communicate 

between the module and the telephone lines. The collection of 

messages is the interface to the telephony component of the Boston 

firmware and provides all the facilities for management, call control, 

and performance statistics monitoring. Control message naming 

conventions in the BSMI are descriptive of the functions they serve 

and make it easier to develop applications. When developing an 

application, you do not need to have a detailed knowledge of the 

protocol involved, although a general understanding of call models is 

beneficial. You can use one of many different signaling protocols 

such as T1/E1 PRI; R2; and Local Exchange Carriers (LEC) T1 

Robbed Bit, Analog and BRI. See 

information about the protocols.

BSMI is not supported on QSIG.