In the SRND for CME, page 2-1, it was mentioned that
"The single-site model has the following design characteristics:
? Single Cisco Unified CallManager Express (Cisco Unified CME) router or dual Cisco Unified CME
router for redundancy"
I would like to have a setup with two CME routers on the same LAN, the intention is to have redundancy and automatic failover should one of the CME router go down.
1. Please let me know how can I achieved this? Any documents or configuration guide would be great!
2. In addition to the automatic failover, is it possible to have load balancing between the two CME routers?
3. Usually CME is deployed with incoming calls from PSTN. However, my client have the incoming calls from a satellite system and I am in the process of checking what will be the signal type from this satellite system. Have anyone done this kind of implemetation before?
Please see the following document on how to configure redundant CME support:
Load balancing is not support, neither necessary because a single route has all the performance needed to support the phones.
Particular attention must be given to how to connect the external lines for redundancy. The document above suggest a method for analog phone lines, other methods are available for digital interfaces.
Note with CME you will not have an easy way to configure very low bit-rate codecs that are often desired on satellite links, however you will be able to use G.729 very easily.
A workaround about this problem, is to have in the router, hairpinned ISDN BRI or PRI interfaces that will allow any type of transcoding to work.
Hope this helps, please rate post if it does!