Unvailable agents without voicemail break queue
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agillis
I encountered the same problem noted here:
http://fonality.com/trixbox/forums/trixbox-forums/help/static-agent-without-voicemail-breaks-queue-and-plays-line-busy-transfer-
In short, when a single static agent's extension is unavailable (unregistered in my case) and does not have a voicemail box, the queue is answered by busy-transfer menu.