North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: How reliable does the Internet need to be? (Was: Re: Converged Network Threat)
Thus spake "Steve Gibbard" <[email protected]> > 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. S 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
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