Hanging up incoming call causes GDBus.Error:org.freedesktop.ModemManager1.Error.MobileEquipment.Unknown: Unknown error
Epic: https://source.puri.sm/Librem5/use-cases/issues/1, https://source.puri.sm/Librem5/use-cases/issues/95
Full error:
WARNING **: 13:35:42.672: Error hanging up ModemManager call to `07xxxxxxxxx': GDBus.Error:org.freedesktop.ModemManager1.Error.MobileEquipment.Unknown: Unknown error