Hi!
I have exactly the same problem on EM160R_GL and Mikrotik RBM11G
At the start of the router, the modem will not up the link and does not received an IP address. It’s on wait the registered status.
Disabling and then enabling the modem interface resolves the issue.
Firmware’s:
Мodem - EM160RGLAUR02A09M4G and EM160RGLAUR02A10M4G
Router - RouterOS from 7.1.5 to 7.8