With the help of Auto attend IVR (Interactive Voice Response) it can possible to play prompt.
Easiest way I can think of...
Designate a number for the operator to dial and map it to a simple ICM script. All the script needs to have is, assuming you are using IVR, play a simple non-interruptible/no barge in IVR prompt, after this a goto script node and send it to the correct ICM routing script.