[VoiceOps] Geographic redundancy

[Paul Timmins]

Failing over SS7 and TDM switches as you know is pretty nontrivial. 
Maybe it's easy if you just gate TDM to IP, but if you have TDM switches 
you're probably doing other things with them that require a certain 
proximity to your customer, and the more longhaul you depend on, the 
higher the risk of backhoe fade between you and your customer.

I've got some ideas for how to crack the nut of keeping an SS7 voice 
network up, but they're expensive and require a 1:1 overlay on capacity 
and the actual cutover is likely to distract our technicians from 
restoring the actual production site, which is also our offices. 
Likewise with the data networks, I'd have a lot of idle gear I can't 
monetize, and capacity I have to overbuild and not use.

I've been gravitating toward the ILEC model of just spreading the 
equipment out so it's closer to the end users, so any failure only 
affects a small segment, that depending on what caused the failure, may 
not care that you're down (tornados, severe wind damage, flooding, 
nuclear strike).

Unless there's something obvious I'm missing here, of course.

-Paul

Hiers, David wrote:
>
> Silence? Yeah, that’s about what I thought I’d get. It’s probably on 
> everyone’s list, but it’s a pretty tough nut to crack…
>
> I wonder if this topic isn’t big enough to merit some sort of focus 
> group. Is kind of planning on anyone’s plate now?
>
> Thanks,
>
> David Hiers
>
> CCIE (R/S, V), CISSP
> ADP Dealer Services
> 2525 SW 1st Ave.
> Suite 300W
> Portland, OR 97201
> o: 503-205-4467
> f: 503-402-3277
>
> *From:* voiceops-bounces at voiceops.org 
> [mailto:voiceops-bounces at voiceops.org] *On Behalf Of *Hiers, David
> *Sent:* Friday, August 07, 2009 8:14 AM
> *To:* voiceops at voiceops.org
> *Subject:* [VoiceOps] Geographic redundancy
>
> What with the NANOG list being flooded with news about the flood 
> (http://www.datacenterknowledge.com/archives/2009/08/07/water-main-break-at-key-nyc-telecom-hub/), 
> I figured it'd be a good time to ask....
>
> Has anyone really solved the whole config sync and operational 
> failover issues to provide full geographic redundancy for a hosted 
> voip network? Failing over TDM DS3s, SS7, IP, SIP, voicemail, IVR 
> programming, etc, such that there is no user-observable indication 
> that failover occured between two calls is the big goal.
>
> Thanks,
>
> David
>
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