FA-96704 / Phone number formatting / Member archive

Emergency and service code classifier: emergency codes are matched as prefixes · case 04

Service code "1331" is classified as emergency.

Member previewVariant 4 · 3 implementations · 12 checks per implementation

Case contract

Input [dialed, country] with toy tables AA (emergency 133/144, service = 4 digits starting 1, trunk 0, 9 national digits) and BB (emergency 755, service = 3 digits starting 7, no trunk, 7 national digits). Remove spaces; strip any number of leading "*NN" feature codes into tags. The rest must be digits. Classify in order: exact emergency code, service code, then a national number (trunk required and removed when the country has one). Return tags + [class].

Why this case matters

Emergency and short service codes must be recognized before any national formatting, or emergency calls are rewritten or blocked.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
service code sharing the emergency prefix	`["emergency"]`	`["service"]`	Failed

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