Following some trial and error, my issue doesn't appear to be a Voxalot specific problem but some configuration that I had to do at voip.ms.
It would appear that I need to set my "Dial Time Out in seconds" at voip.ms for my DID to be longer than the voicemail "ring duration" setting at Voxalot to allow Voxalot VM to pick up first. (That's my assessment anyway).
I'll continue to monitor the problem but so far so good.
Thanks to all who took the time to view my request.