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Making Two-Channel Call Transfers (Tromboning)
November 2009 190
Making Two-Channel Call Transfers (Tromboning)
This section provides information about creating a two-channel call
transfer (trombone call transfer).
A two-channel call transfer occurs when an application connects a
calling party to a called party with a full duplex connection, while
maintaining control of both calls. For some applications, this method
of transfer provides redundancy with no added benefits. However,
for applications that require monitoring or functionality not provided
by the caller and called resources, this method supports the
additional functionality. The Bfv API manages two-channel transfer
by transferring an existing call to another channel and becoming a
link in the network rather than an end-point for either channel.
An application might use this method of call transfer to monitor or
record the calls or to perform an activity such as speech recognition
during the call.
When configuring your module for two channel call transfer activities,
establish a maximum of 5 channels per DSP configuration.
The section contains the following:
Setting up the Two-Channel Call Transfer
Actions During a Two-Channel Call Transfer
Terminating the Two-Channel Call Transfer
Disconnecting Resources