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The migration of Elastix from VMWare ESXi to Microsoft Hyper-V didn't run as smoothly as I might have hoped but the solution was fairly simple.

1. I booted the ESXi VM with CloneZilla and performed an offline backup of the server to a SAMBA or Windows file share.
2. I created the Hyper-V VM, matching the disk size, RAM and CPUs to what I was previously using on my VMWare server.
3. I booted the Hyper-V VM with CloneZilla and performed the restore.
4. After the restore, the VM was attempting to boot with a CentOS kernel which resulted in a kernel panic. I modified /boot/grub/grub.conf and set the default boot kernel to the Elastix kernel. In my case that meant modifying line 10 to default=2.

I was then able to reboot and dial in/out.