Callback solution with i4b?

[André Braselmann]

Hi there,

a basic question about connecting 2 D-channels as telephone lines (i4btel0 and
i4btel1) in i4b: 

Is it possible to create a callback solution with this two interfaces?

For instance: Voicecall comes in, CLID is checked and a callback to this
number is initiated. When the connection is made, the caller gets the
option to dial out (make a call) via the second channel. DTMF
recognition is necessary. 

But how do i make the call and join the two devices?
The BRI interface is a FritzCard PCI.

Are there any Shellscript examples?

ThanX so far...

GreetZ from EastFrisia

Andre