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22 Voice API for Windows Operating Systems Library Reference — November 2003
Function Summary by Category
The transmit component of each channel of a device is assigned to a time slot at system
initialization and download. To listen to other devices on the bus, the receive component of the
device channel is connected to any one time slot. Any number of device channels can listen to a
time slot.
Note: When you see references to the SCbus or SCbus routing, this information also applies to the CT
Bus. That is, the physical interboard connection can be either SCbus or CT Bus. The SCbus
protocol is used and the SCbus routing API applies to all the boards regardless of whether they use
an SCbus or CT Bus physical interboard connection.
A set of TDM routing functions exist for each Intel® Dialogic library, such as fax (fx_ functions),
modular station interface (ms_ functions), and conferencing (dcb_ functions). See the appropriate
API Library Reference for more information on these functions.
TDM routing convenience functions, nr_scroute( ) and nr_scunroute( ), are provided to make or
break a half or full-duplex connection between any two channels transmitting on the bus. These
functions are not a part of any library but are provided in a separate C source file called sctools.c.
The functions are defined in sctools.h.
The TDM routing functions are:
ag_getctinfo( )
returns information about an analog device connected to the TDM bus
ag_getxmitslot( )
returns the number of the TDM bus time slot connected to the transmit component of an
analog channel
ag_listen( )
connects the listen (receive) component of an analog channel to the TDM bus time slot
ag_unlisten( )
disconnects the listen (receive) component of an analog channel from the TDM bus time slot
dx_getctinfo( )
returns information about voice device connected to TDM bus
dx_getxmitslot( )
returns the number of the TDM bus time slot connected to the transmit component of a voice
channel
dx_listen( )
connects the listen (receive) component of a voice channel to a TDM bus time slot
dx_unlisten( )
disconnects the listen (receive) component of a voice channel from TDM bus time slot
nr_scroute( )
makes a half or full-duplex connection between two channels transmitting on the TDM bus
nr_scunroute( )
breaks a half or full-duplex connection between two TDM bus devices