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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