What I also notice in Australia is when that music plays the volume slowly tends to zero. I worry that I've lost reception, but when they pick up its fine. I al

What I also notice in Australia is when that music plays the volume slowly tends to zero. I worry that I've lost reception, but when they pick up its fine. I also notice the phone seems to "know" its on hold as there is an audible cue, so perhaps the carrier is deprioritising on hold audio.