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Support for emergency voice calls

Aleksander Morgado requested to merge aleksm/ModemManager:aleksander/emergency-calls into master

The Voice interface logic is updated as follows:

  • The interface is available always, even in Failed (No SIM) or Locked (SIM-PIN locked) states.
  • A new "EmergencyOnly" boolean property specifies whether only emergency calls are allowed.
  • We load the list of emergency numbers programmed in the EF_ECC SIM file.
  • We explicit forbid non-emergency calls while in emergency-only state, by following 3GPP TS 22.101.

The logic of 3GPP TS 22.101 is as follows:

  • 112 and 911 shall always be available.
  • Any emergency call number stored on a SIM/USIM when the SIM/USIM is present.
  • 000, 08, 110, 999, 118 and 119 when a SIM/USIM is not present.
  • Additional emergency call numbers that may have been downloaded by the serving network when the SIM/USIM is present (we ignore this on purpose in our logic, because if our network provides an emergency numbers list, we're no longer in emergency-only mode).
Edited by Aleksander Morgado

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