If you’re still in the planning stage, there’s a lot more to think about. Your Asterisk failure detection will be very simplistic (is the process dead). Synchronization of data – without risking synchronization of corrupt data to a peer. Prevent a deteriorating/failing peer corruption from corrupted the other peer (i.e. now shared resources). Awareness of upstream (e.g.: route/network) failures making the peer unavailable – and how to detect that. Etc. etc.
Here’s a good checklist of things to consider in your design: http://www.voip-info.org/wiki/view/Asterisk+High+Availability+Design If you are building a small/home office HA then the free version of commercial tools may be the way to go. If have a $0 budget but for a larger installation, use the design guide above to help figure out which compromises to make. (Heartbeat / Linux HA is better than nothing). -M-
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