I work on VoIP systems and 999 is set up on these as a priority dial (built into the system as "emergency number"), giving it's route out to whichever ARS is av

I work on VoIP systems and 999 is set up on these as a priority dial (built into the system as "emergency number"), giving it's route out to whichever ARS is available. I cannot see this limited by the "9 for an outside line" as it bypasses these constraints, along with having to login to a phone to use 999.