said by amd64now:
voip.ms got back to me. No issue found.
Voip.ms folks are a great group of people and usually quite helpful. I know their intentions are good. Sadly though, I find I sometimes have to bend over backwards to prove to them there is an issue before they will admit it - or even bother to look into it on their end - especially when there are intermittent problems like the ones described in this thread.