I value scripts a great deal, because I value word choice so much. My entire career has been spent tweaking and perfecting words to get the desired result, so you won't find me in the "scripts are too limiting camp."
Having said that, scripts have a purpose: to tell you what to say. By definition, a conversation is NOT following a script, but there may be elements of scripted information within the dialog.
Now, if your question is more about "how do I investigate customer needs on the phone" or "how do I do open up conversation on the phone, that's another matter.
I have to say I admire Gold calling's explanation of open and closed probes that he refers to in the other thread. It's a must-read for all!