iPhone over-riding audio settings when receiving an incoming call
I have an iPhone Xr running iOS 16.4.1(a).
I observe a problem when I am using the phone to listen to music via Bluetooth-connected audio equipment. I have experienced this problem with Sennheiser PXC-550 and PXC-500 Mk II headphones, as well as Sony WF-1000XM4 and WF-1000XM3 earbuds.
I can be listening to music. My handset receives the call, and I can hear the "ring tone" over my headphones/earbuds to alert me to the caller. I swipe to take the call... and the audio for the call immediately switches away from my Bluetooth device and on to the handset.
This happens with 100% consistency and is experienced across 4 different connected peripherals. It seems likely that this is an issue with an iOS configuration setting, but I've not found it yet.
Any ideas please?