North American Network Operators Group

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Re: How reliable does the Internet need to be? (Was: Re: Converged Network Threat)

  • From: Stephen Sprunk
  • Date: Sat Feb 28 05:25:34 2004

Thus spake "Steve Gibbard" <>
> When sending somebody e-mail you assume they'll probably check their
> e-mail and receive the message eventually, but you have no idea if they'll
> get it right away, or if they'll notice it along with all the other e-mail
they get.
> When phoning somebody, you know right away whether they answer,
> and you know right away how they respond to whatever you have to say.

In theory, that's a job for DSN.

> If you really need to get in touch with somebody right now, do you call
> their presumably more reliable land line, or their presumably less
> reliable cell phone?

I think this was intended as rhetorical, but I'll bite...  If I want to
reach someone _right now_, I call their cell phone, because the odds are
significantly higher they'll be near it.

E911 is a mess even for non-mobile users in a single office building.  Full
compliance, at least with my state's regulations, requires phone numbers be
localized to within a 100ft2 space.  This means a VoIP system must be able
to automatically trace a user's IP address, MAC address, physical port,
cable run, and at least portion of a floor -- not to mention figuring out
what the correct telco circuit to route the 911 call out, which obviously
varies depending on where the user happens to be sitting.


Stephen Sprunk        "Stupid people surround themselves with smart
CCIE #3723           people.  Smart people surround themselves with
K5SSS         smart people who disagree with them."  --Aaron Sorkin