Dialogic 6.2 Manuale Utente

Making Two-Channel Call Transfers (Tromboning)

November 2009

190

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.

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