Anybody had a phone call with Jolla in which the sound on the other end turned into digital noise?

Today I called someone who was already on talking to someone else. She had the knock feature on incoming calls while on another call and chose to answer mine. After she answered my call, all I could hear was this screechig noise. I'm old enough what what ****ed up analog phonelines used to sound like. This wasn't anything like that. For lack of better way to describe it, it was 'digital ear raping'. I've been using GSM phones since 1995 and never heard voice as freaky as today.

Anyway, she called me back after her previous call was over and that went well.