I haven't heard from the NCS, but this is certainly a hoax. For
your information, the procedures telephone carriers follow are
documented on the web site
This is not how such a request would be made. In addition, ISPs
are *NOT* currently part of the civil defense, or any of the other
federal emergency plans. For the most part, the federal plans are
silent about the Internet. So the military doesn't really have a
way of making this request to ISPs even if it wanted to do it.
Once again, ISPs should attempt to do things out of the ordinary.
Jokers have impersonated law enforcement in the past, trying to get
information out of ISPs.