The problem is with one of our upstream carriers, who have acknowledged a network issue in Western Canada.
We have no ETR from them yet,
Outgoing calls are generally working at the moment
If you see a call you can't answer, you can call them back right away.
Upstream carrier confirmed that as of 4:08pm MDT, problems have been resolved. There should be no further related issues.
Calls now seem mostly to be working, but as of 3:12pm, the upstream carrier was still reporting some issues with no ETR, so there may still be lingering problems.