eCall Plus to eCall Only transition and recovery path

摘要

Responsive to detecting transition from an eCall Plus mode to an eCall Only mode, and to acknowledgement from a service delivery network (SDN) of an alert of the transition sent to the SDN by a telematics controller, the telematics controller reattaches to a network in eCall Only mode. Responsive to transition from eCall Only mode to eCall Plus mode, the controller reattaches to the network in eCall Plus mode.