Caller ID - Part II

When I call an office and ask for "Jack," the person on the other end of the line often asks, "Sure, may I tell him who is calling?" I give them my name and I am transferred.

Here's where it gets weird ... "Jack" answers the phone with, "Hello this is Jack." Am I supposed to identify myself or does he already know it's me? If the receptionist did their job, he should be able to answer with, "hi Justin."

Please, if someone tells you who is calling, just answer with "Hi, (enter name here)."