> Emergency call handling tends to expose edge cases that normal calls never hit.

Indeed. It now has been revealed even telcos were not doing real world tests https://www.abc.net.au/news/2025-10-08/surprise-drill-for-te... and new laws were passed this month that they must make it possible for an independent university to do testing https://www.acma.gov.au/articles/2025-10/acma-strengthens-in...