[cisco-voip] IPMA Redundancy

[Randy Wells]

I have a couple of questions about IPMA and redundancy.  Assuming I have a CallManager Publisher and Subscriber, with the Subscriber being the first choice for call processing and the Publisher backing it up, in a cluster and the IPMA service enabled on both...
 
- Under the IPMA Service Parameters there are options for CTI Manager IP addresses and IPMA Server IP addresses.  The CTI Manager options are server specific and the IPMA options are cluster wide.  Assuming I want everything to connect to the Subscriber and failover to the Publisher, including the IPMA service, what would the CTI options look like on each server?
 
- When installing the IPMA assistant client, which server should I use to install this from?  Subscriber since this is the primary server hosting the service?
 
- What IP address should I use for the IPMA phone service?  If the subscriber, what happens to the phone service when the Subscriber goes offline?  How does this failure impact the phones?
 
- What should be expected when the Subscriber goes offline?  I understand the need for the translation pattern to deal with IPMA failure, but what should still work when the Subscriber fails and the Publisher takes over the IPMA service.
 
Thanks,
Randy
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