+5 to each of the responses above. That's exactly what we did to start with, then eventually purchased the cluster licencing for them. We had half our recording aliases configured on one box, and half on the other, and a manual process to replicate them one way or the other in the event of a failure of one of the devices (so they'd keep the same E.164). Wayne -- Please remember to rate responses and to mark your question as answered if appropriate.
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