innit.
Yes, it is.
Initial call, Who you are and what you want (zone transit, FIS, whatever)
Pass-Your-Message, what you are, Where you are, where you're going, what your doing on the way. etc.
RT is a conversation with someone you can't see and have likely never met. Imagine if you initiated a face to face conversation, or a phone conversation, with a simple "hello, I'm Xxx" and left it at that. Why would anyone want to carry it on? If someone rang me and said, "hello, I'm Jim", my response would likely be "and I care because...?"
JR