It's quite clear that Sauron wanted Pippin brought quickly because he had a craving for a nice, tasty dainty. These are difficult to be had in Mordor, as everyone knows, and when he clapped eyes on Pippin, he just couldn't wait. He hung up quickly so he could go order the manufacture of some whipped cream (in Mordor it really is "whipped"). That's one theory, anyway.
Take a look at things from Sauron's point of view.
You know that Saruman is not a loyal ally.
You know, in fact, that Saruman is in a race with you to find the Ring.
Saruman has not been answering his phone. In fact you've sent a Nazgūl across the River sooner than you wanted to in order to find out why.
You likely know that an attack on the Fellowship was made, not by your forces, and perhaps you know that the attackers were attempting to return to Isengard.
Now,
your phone rings. It's Saruman. At this point, the only reason you can think of for him to be calling is that he has decided to make peace with you, so you answer the phone, "So, you have come back?"
But now you see that it's not Saruman after all. It's one of those furry-footed little creatures who have had the temerity to steal your Ring (Precious!!).
Saruman must be showing it to you. Why?
Perhaps he has discovered the Ring and is showing you this creature to demonstrate that (a) he has it and (b) he wants to give it back to you. Nix. If Saruman had found the Ring, he would have taken it.
Perhaps he has discovered the Ring and is showing you this creature to taunt you, to rub your face in it that he has found the Ring, and has no intention of giving it to you. Not likely. Saruman is not a complete fool. Even if he never said the words from UT, the logic behind them is pretty persuasive:
Quote:
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Originally Posted by Saruman
"...if I knew where [the Ring] was hid, I should not be here, but long gone before you take it."
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Perhaps, by attacking the Fellowship, he made his last ditch play to get the Ring for himself. Now, having failed, he sees the writing on the wall. The Ring is beyond his grasp. War is imminent, and you will win. Thus, he is showing you this prisoner as a peace offering. You could question the prisoner here and now, but it may say something aloud that you don't want Saruman to hear. And anyway, torture over the phone just doesn't compare with torture in person. Just in case Saruman has any ideas about questioning the prisoner himself, as he planned to do with Gandalf, you issue him a warning. Then you hang up so you can get NPS (Nazgūl Parcel Service) dispatched.
You don't ask to speak directly to Saruman just to make him sweat a bit about whether or not you will accept his peace offering.
That's my take.