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Making Two-Channel Call Transfers (Tromboning)
November 2009 193
variable where it is easily accessed and restored when disconnecting
the two-channel call transfer (see Terminating the Two-Channel Call
Transfer on page 199).
When connecting and disconnecting resources, the application
should primarily use the BfvCallSWConnect() function. The
application must provide all connections with a source and
destination resource. The following rule is very important when
connecting resources together:
A source resource can have many destination resources, but a
destination resource must have only one source resource.
Before setting up the two-channel call transfer, remove any existing
connections that conflict with the transfer connections.
For a model of a two-channel call transfer, see Figure 13. The OUT
label represents the source of the connection and the IN label
represents the destination of the connection.
Figure 13. Connections for a Two-Channel Call Transfer
The application removed the connection from the output of
Channel 0 to the input of network timeslot 0 and the connection
from the output of Channel 1 to the input of network timeslot 1. If
these connections were not removed from Figure 12 on page 192,
then Channel 0 and network timeslot 1 would both be attempting to
transmit to the input of network timeslot 0, violating the above rule.
Channel 1
In Out
Channel 0
In Out
TSlot 1
Out In
TSlot 0
Out In
Person B Person A