Blind Transfer

[Windsor]

Thanks for your prompt support.
We want to use the expansion module keys to effect the blind transfer. See screen shot of the configuration we have for the expansion module - all set up as BLF - so we can see the extensions that are off hook.

   

When we press the expansion module extension buttons we do not want callers left on hold after the operator thinks that they have transferred them.
This happens when after having hit the expansion extension button to transfer the caller to an extension a subsequent call comes in and is picked up by the operator before the first transfer is picked up. We want the first call transferred to the extension (not left on hold as happens now). I understand that this is termed a "blind" transfer How can we configure this behaviour?