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Making Two-Channel Call Transfers (Tromboning)
November 2009
192
Figure 12.   Connections for Standard (non-transfer) Operation
In 
 the output slot of Channel_0 transmits to the input slot 
of network timeslot 0, while the output slot of network timeslot 0 
transmits to the input slot of Channel_0. The connections between 
Channel 0 and network timeslot 0 create a full duplex voice session. 
Also observe that the output slot of Channel 1 transmits to the input 
slot of network timeslot 1, while the output slot of network timeslot 1 
transmits to the input slot of Channel 1.
Use the following Bfv functions to access or change the connection 
information that is maintained on the Brooktrout hardware: 
„
BfvCallSWClearConns()
Clears resource connection
„
BfvCallSWConnect()
Connects or disconnects resources
„
BfvCallSWGetConns() 
Queries for connection information
„
BfvCallSWGetInfo()
Provides information about the two-channel call
Refer to Volume 1 of the Bfv API Reference Manual for further 
information on these functions. 
The BfvCallSWConnect() and BfvCallSWGetConns() functions 
are the most important when setting up a two-channel call transfer. 
Before creating a two-channel call transfer, call the 
BfvCallSWGetConns() function to get the current connection data 
that is stored on the module. Store this information in a local 
Channel 0
In
Ref In
Out
Channel 1
In
Ref In
Out
TSlot 1
Out
In
TSlot 0
Out
In