Direct Phone Number which is regarding for AS297

Unnamed Administration sources reported that John R. Levine said:

So I agree, any NOC or anyone else who expects to be reachable from
all over the world needs to have a regular old phone number.

American Express still says "International; call collect,
1-nnn-xxx-yyyy" on the back of their card. So they have don't think
any other scheme will work {yet}...