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The Bfv API Functions
November 2009 36
Call Control
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.
Bfv Call Control
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.
BSMI-Level Call Control
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 Robbed Bit Signaling on page 264 -
Using the BSMI R2 Signaling Capability on page 336 for more
information about the protocols.
Note: BSMI is not supported on QSIG.