That appears to be the same issue reported here, in June: Spitz AX Modem going offline
call_end_reason is 1
call_end_reason_type is 2
call_end_reason_verbose is 210
Reason 210 maps to PDN IPv6 call disallowed based on the error codes here: https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/blob/main/src/libqmi-glib/qmi-enums-wds.h