Bluetooth VOIP call control

[kingscrossing]

Has anyone managed to get bluetooth call controls like answering and hanging up VOIP calls from bluetooth headsets working on this phone? Normal calls work fine but if I'm say on a Hangouts call and hangup from my headset the call audio just switches from my headset to the phone speaker instead of disconnecting the call like one would expect. I had the same problem on my Samsung Galaxy phone but I thought with this being a Pixel, call handling regardless of cellular or VOIP would be handled consistently similar to how iOS handles them. Anyone have any tips or workarounds to get this working?