[cisco-voip] Extensiom Mobility redundancy in cluster over WAN

[keli at carocomp.ro]

I'm trying to figure out the best way (or rather a working way) for EM  
redundancy in a cluster over WAN setup. It's a 6.1(2) cluster, so EM  
should work even when the first node is down.

I've read the SRND, but the solution therein doesn't works for me completely:

- I can have a virtual IP through SLB for server failure resiliency
- I can add multiple service URLs for extension mobility login/logout.  
Though this could be somewhat confusing for users, if it adds to the  
reliability, the better.

However, a SLB IP still has to reside on a router on either side of  
the WAN. What to do in the case of a WAN failure? How Can I ensure  
that EM will still work on both sides of the WAN (there are only two  
major sites, btw) in case of a complete WAN outage?

Since EM is extensively used here this would be rather important to be  
reliable.

thanks,
   Zoltan

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