We don't usually post about these as there are normally done out of hours when no calls in progress and so cause no down time. However, recently, there was a small issue with some calls not getting through after an upgrade. We are planning an upgrade of one of the VoIP servers this evening, and we will be monitoring for any issues. If you have problems with calls please let us know ASAP. If all goes well we'll do the other server later in the week. The upgrade improves the IPv4/IPv6 fallback handling where customers have both IPv4 and IPv6 endpoints.
No issues reported so we plan to upgrade the second call server today.