Microphone not working on video calls and Siri after update to iOS 9.1

After checking the web i realised i'm not the only one with this problem. After update to iOS 9.1 Siri can't hear me and i can't use video calls because the microphone is not working. Works fine when the headset is connected. Also tested the microphone and it works fine on normal calls and voice memo. I use video calling every day and i'm getting more and more frustrated every day. Any news when are they going to fix this??