Thanks to Orr A, he told me he bought a Pixel 3a from Google Play store and used it in Israel, and without root Boldbeast Recorder works great, recorded calls are crystal clear in both sides. This is a good news.
However in some countries the call recording feature was disabled by Google, you'll find the caller's voice is very weak in recordings, no matter what recorder you are using in the market. In this case you should root the phone, then Boldbeast Recorder can fix it perfectly. After root the phone please use these settings to record calls: https://www.boldbeast.com/forum/topic17 … rding.html