Call end reason 1 == “generic unspecified”
Call end reason type 2 == “internal”
Call end reason verbose == “interface in use, config match”
Those values are also defined in libqmi, see https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/blob/master/src/libqmi-glib/qmi-enums-wds.h
absolutely no idea why that happens though 
don’t think I’ve personally seen that error when using libqmi+ModemManager