voiceover not reading call information when muted when incoming call

Hello applevis users.
I ran across a problem the other day. I got a incoming call on my watch and my hphone of course, I was trying to see who was calling using voiceover on my phone but it was like my phone was muted I had the switch on mute when I flipped it from mute on, to mute off, then my voiceover speech came back. have any of you ran into this I'm running IOS 10.2, so when the ophone was on silent mode I couldn't hear the speech when the call came in.
had to flip the switch to unmute them magicly the information came back but I usually miss the call by then.