Phosh 0.27.0 together with GNOME calls 45.alpha.0 added initial support for emergency calling from the locked phone screen. The following gives a short overview on the involved interfaces so you can check if this should already work for your provider or country, how to enable this feature and where the journey is going.
Enabling emergency call support Link to heading Until we have tested more providers emergency call support is disabled by default to not give a false sense of security.