[VoiceOps] Geographic redundancy

[David Birnbaum]

Zero is nice, but may not be feasible.

I would say "it works" means that your failure scenario may run from "zero", in 
which case the customer doesn't notice that you've lost half your trunking, to 
what I would consider "minor", which means that most of your calls stay up and 
perhaps dialtone/call setups fail for 10-20 seconds.

Any outage longer than that I would not consider acceptable (as part of the 
five-nines we all aim for).

David.

-----

On Thu, 13 Aug 2009, Nathan Stratton wrote:

> On Thu, 13 Aug 2009, Mark Holloway wrote:
>
>> When you say "it works" - what is the impact to the customer?
>
> Zero
>
> -Nathan
>
>> On Aug 13, 2009, at 10:18 AM, Mark R Lindsey wrote:
>> 
>>> We've done it for several carriers, and it works. Supporting all the 
>>> fault-tolerance scenarios can be extremely complex, but it's definitely 
>>> achievable. It introduces a set of requirements on the network, and 
>>> especially on your connectivity to subscribers.
>>> 
>> 
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