I hope this isn’t a stupid question, FaceTime and Aftershokz

Hi all,
I’m wondering about something. I was lucky enough to snag a pair of Treks Air Aftershokz headphones, and have a question about their compatibility with FaceTime audio. Can these headphones answer a FaceTime call? If so, is it the same command as the answering calls on a regular phone call? I am wanting to get the most use out of these babies as possible, so feel free to write me back. The answers I get so far are that there shouldn’t be a problem, but the reason I’m asking you guys is that I was facetime audio calling a friend yesterday, and I answered on the phone itself, which picked up the call even though the headphones were connected. I couldn’t hear the friend’s voice through my headphone’s channels. So how do I get FaceTime Audio to work like that on Aftershokz? Thanks in advance.
Beth AKA Denverqueen