AFAIK, there are none available in public. However billing products like IXC and PortaOne have inside such customised Cisco TCL scripts included. If you find one – you are lucky 🙂
Also, using the TCL IVR 2.0 you can easily write your own script.
I know that PotraOne have it included. I trying to write my own script but i have some problem after disconnected calling party. When i doing call to calling party and destination number i cannot connect them together. Thats why i need any simple example. What i know PotraOne is using two tcl scripts to do callback. Well i need to read again documentation.
> Is there Cisco TCL example for callback?
You can get the PortaOne callback script mentioned earlier (it is rather inexpensive) and use it as an example to develop your own callback.