|amenity = emergency_phone|
|DISCOURAGED, use emergency=phone instead.|
|Used on these elements|
|Tools for this tag|
...has always been the label on this wiki page, however...
This amenity=emergency_phone tag was proposed (Proposed features/emergency phone) in 2008 and adopted by mappers to some extent. It was added to the 'standard' rendering (while emergency=phone is not currently rendered) In the discussion of this rendering issue questions are being asked about automated edits skewing the stats. Meanwhile JOSM validator comes down heavily in favour of the emergency=phone and will auto-fix to it.