Call audio constant desturbance, both mic and speaker.
I called my friend and she said it sounds like I'm calling from a Nintendo ds, and so I thought it might just be from the worse mic and speakers, because she didn't sound good either.
Later I switched to the new kernel version to see if I could call her using earphones, and so the mic and speakers wouldn't be an issue, during the call the audio was really bad, I couldn't hear her very well, lots of noise, and audio compression it seems, it was so bad she said she couldn't hear me and we called on discord instead, on the OP3 we never had this issue.