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Re: Qos Beginner [7:86262] posted 03/25/2004
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At 6:52 PM +0000 3/25/04, "Chuck Whose Road is Ever Shorter" wrote:
>  > When you start working with VoIP, think about situations like that to
>>  know how absolutely, positively critical it is that it work. A Blue
>>  Screen of Death may literally be responsible for human life.
>Well said, and point well taken
>The problem we in sales continually face is getting customers to think this
>way, instead of thinking "cheap". I can't tell you how many times I and my
>fellow engineers have been beat up over a few thousand dollars in a million
>dollar system because the customer does not think that even minimal
>redundancy / failover is necessary. It does not help when vendors are our
>there telling customers how much money they can save going VoIP

It could be very interesting to talk to the business liability 
insurers, or the internal risk management function if they have one, 
about what the cost of the lawsuits, loss of business, idle staff, 
etc., would be if mission-critical functions go out.

Telephone service is in an entirely different risk category when it 
comes to life safety issues, if a VoIP failure might mean not being 
able to call emergency services.  Incidentally, especially in the 
current era of terrorist threat, I still suggest that even if one has 
a multiply redundant VoIP system, it's still wise to have a few POTS 
lines and/or cell phones in appropriate emergency locations.

As a practical example even with conventional PBX technology, I can't 
think of a hospital where I've seen the systems, where each nursing 
unit, lab, surgical suite, etc., didn't have a backup POTS line that 
bypassed the PBX.

Incidentally, one of the places that really should have POTS and 
cellular is the network operations center responsible for keeping 
VoIP running. Think about it!

Apropos of NOC's in the US, if you have international customers or 
sites, never rely on a toll-free number alone for the hotline to the 
NOC. It's very possible that it can only be dialed from inside the 
US, or even just from parts of the US. Don't assume that just because 
Canada and Mexico are part of the North American Numbering Plan, 
tollfree service will work across borders. Many Canadian phones can 
call US tollfree numbers and vice versa, but it's certainly not 

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