Call throttled - ModemManager not up

[ratnavel]

HI,

I am running a

ModemManager 1.10.8 on Ubuntu 16.04.4 LTS.
Sierra Wireless EM74xx modem

There was a power outage when the unit was running and resulted in the
following error




*ModemManager[1419]: <info>  Modem /org/freedesktop/ModemManager1/Modem/0:
state changed (registered -> connecting)ModemManager[1419]: <info>  error:
couldn't start network: QMI protocol error (14):
'CallFailed'ModemManager[1419]: <info>  call end reason (1):
'generic-unspecified'ModemManager[1419]: <info>  verbose call end reason
(2,209): [internal] pdn-ipv4-call-throttled*

It remains in this state and even a Modem Reset is not recovering it.
Restarting the unit/ ModemManager daemon hasn't helped.

Any pointers on what is causing this issue and how to come out of this
state ?

Thanks,
Ratnavel
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