Practice your responses out loud. It will most likely by a behavioral interview, "Tell me about a time when...."
Really good advice is to pick 3 or 4 'stories' that you want to make sure the interviewee gets to hear - these should be the things that you have done in your career that are most impactful (saved the company time, money, or other resources). And be sure you quantify it. "I saved the company..." or "This allowed us to cut production set up time from 3 days to only 1 day, saving the company XXX" - make the results real.
STAR - Situation, Task, Action, Result -- set up the situation and what the problem or challenge was, what actions YOU took, and what the result was. And then PRACTICE your stories out loud - make sure you're not rambling.
It doesn't matter a whole lot the EXACT question they ask, you can almost always divert into the story you want to tell. And if they ask you a question that you really, can't think of a good answer for on the spot, you can always say, "well, I'm not sure if this directly answers your question....but in my last position..." and then tell one of your impactful stories.
In a 30 minute phone interview they are trying to judge if you have good basic experience, and can you communicate well (efficiently, easy, relaxed) - unless it's a technical interview with a technical manager. But mostly this is screening by HR - you should absolutely know who you're talking with.
Also, have 1 or 2 questions to ask the interviewee (and it shouldn't be about pay or benefits!!) - Do research on their company and come up with a question or two to show your interest and that you put in some effort.
Also, I really like the idea of posting some big signs where you are going to take the phone interview with things like: "Smile" "Relax" "Breathe" "Keep it Short"....or whatever you want to ensure you do. And try to be on a landline in a quiet place with no barking dogs, crying babies, or lawnmowers going!
Good Luck!!