Q: Brand new iphone 6 person on receiving side of facetime gets no sound, mic works with all other functions any ideas why?

I got new phones last night and was getting familiar with it, playing with it. Made a face time call to Mom and I could hear her but she could not hear me, tried it again with my boyfriend and the same thing happened. So I made regular calls, used speaker phone and recorded a memo all to test phone worked fine, I turned the phone off and restarted and even checked for an update. I could not find any reason why this would happen any ideas.

The weird part is its only with face time that you can not be heard but if you use the headphones everything is fine.