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Failover Cisco Call Manager / Unity at different location

Hi.  I am currently using Cisco Call Manager 7 and Unity 7 at my main office.  The other day we had a major fiber cut in our area that knocked out all phone lines, and when this happened we were pretty much screwed.  I was looking to see if there was a way to have a failover/redundant Call Manager / Unity Server in another area.  For example, I have a warehouse that I have a site-2-site VPN to right now.  This warehouse is 45 miles from my office.  This would be a great location for me to have a backup Call Manager and Unity server.  My Staff could drive to this location to work, or use their IP communicators on their laptops to work.  Has anyone out there done something similair to this?  If so I'm curious on how you did it.  Thanks.
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denver218
Asked:
denver218
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1 Solution
 
José MéndezCommented:
Denver,

This is pretty common, and its called Clustering over the WAN:

https://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/models.html#wp1043996

You can set up your phones with a Callmanager Group containing the primary server, and as a fallback option the server in that warehouse. As long as the IP Phones have IP connectivity to it, they will be able to register and call between each others. How would you handle PSTN calls though?
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denver218Author Commented:
Handling PSTN Call was my concern.  I guess I would have to have phone lines at the warehouse that are tied to the lines at my main office.  Or in the event of another emergency the phone company could forward all calls from my main office number to the warehouse phone lines.  What other option would I have?  Thanks.
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José MéndezCommented:
Well, question would be, what kind of emergency? Talking about a fibre outage, I wouldn't expect the PSTN lines to be affected. They too have fall back mechanisms, and should be able to register to your ware house in order to receive and send calls. Again, the key here is to be able to maintain IP connectivity to a "head" somewhere, be it the HQ Callmanager, or the warehouse backup.

If the emergency you are consider is something different like the PSTN circuits of a site going down, then, there are other options but it would be unlikely. You might want 1 T1 hanging off a voice gateway, while a secondary T1 hooks off a different gateway to avoid single point of failure. That is expensive though.

Hope that helps.
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denver218Author Commented:
Right now at my main office I have a call Manager server, unity server, and my Voice Gateway router has two VIC2-4FXO cards with a total of 8 analog phone lines.  A couple weeks ago there was a tractor trailor that clipped the power lines, which took out everything.  Phone lines were cut, fiber, was cut, power was out, etc.  It was a mess.  We are trying to come up with a disaster plan so if something like this happens again, our customers can still get ahold of us.  It really caused us alot of headaches when the phone lines were cut because our customers couldn't get ahold of us.  Since we have this warehouse we were hoping to maybe cluster our call manager and unity server, and be able to recieve calls from the PSTN thsi way.  I just don't know how I would do it in a way that wouln't cost a total fortune.  Thanks.
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José MéndezCommented:
Wow, that is unlikely... but true nevertheless... In that case, there is not much you can accomplish with just Cisco equipment. And not much you can do with few bucks...

In that particular situation,your site is isolated from the Internet and from your Telco, its a physical disaster what we are planning against. I guess your Telco has the last word in terms of what can they do. I imagine they can route calls to a backup trunk terminated at your warehouse. They would charge for that circuit. Thing is, I don't think this is possible with analog trunks, maybe ISDN circuits can cut it.

Another option would be to deliver an extra number to your customers, one that is terminated at the warehouse, and backhauls to your main office under normal conditions. When one of those trucks pass by again (hopefully not) then you will at least get calls at the warehouse. And that would be 1 call per analog trunk, so to receive 10 simultaneous calls, you will require 10 phone numbers mapped to 10 different analog trunks at the warehouse, unless your Telco can switch calls from the recently destroyed circuits to your warehouse circuits.

Its difficult to prevent this situations with low costs, I can imagine that even if you have 2 or 3 or 6 internet providers for your main office, they will all use the same physical path torn down by the truck right?

If your satellites offices (different locations) were still up, they could receive calls on their own set of PSTN circuits, all pointing to the ware house for call control.

Now, if you change your Analog trunks to a SIP trunk for example, things may be a little bit different. It might be possible to arrange calls to be delivered at ip A (main site), and if that IP is dead, route calls to IP B (satellite office).

What you think?
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denver218Author Commented:
It seems like this could cost a lot.  So clustering over the WAN would make my Call Manager and Unity Server redundant, meaning that if my call manager at my main office died the phones would register to the other call manager correct?  The same would go for Unity?  I guess when it comes to having phone lines at both locations may be asking to much.
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José MéndezCommented:
Thaaaat is correct.
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denver218Author Commented:
Thanks
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