You would be hard pressed to find a SIP device that is not compatible with Voxalot. I have had much more trouble with the router than the SIP device. Router NAT works poorly with SIP. You usually need to clearly define the routing path, usually manually, to make for a reliable VOIP experience.
I should also add, locked SIP devices to another VOIP carrier do not work well with Voxalot. You have to unlock them.
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