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Making Two-Channel Call Transfers (Tromboning)
November 2009 198
channel provides silence generation on its output). After playback
is completed, the application can re-establish the full duplex
connection.
The following series of illustrations demonstrate the changes.
In Figure 16, there is a full duplex connection between channel 0 and
TSlot 0, and another full duplex connection between channel 1 and
TSlot 1.
Figure 16. Standard Full Duplex Connections
In Figure 17, there is a full duplex connection between TSlot 0 and
TSlot 1. Channel 0 is recording the caller on TSlot 0. The application
connected TSlot 1 to the reference input of channel 0 to provide echo
cancellation.
Figure 17. A Connected Two Channel Transfer.
Channel 0
In
Ref In
Out
TSlot 1
Channel 1
In
Out In Out In
Ref In
Out
TSlot 0
Channel 0
In
Ref In
Out
Channel 1
In
Ref In
Out
TSlot 1
Out In
TSlot 0
Out In
(Silence)