My VOIP devices have been unable to register on their networks for at least the last 12 hours. These devices were working fine before.
I have tried the Grandstream HT802 with 2 different providers. One is using port 5060, the other 5061.
I have tried the Blink softphone with one provider.
There seemed to be an internet outage yesterday (my internet was not working for a period of at least several minutes). Registering on the VOIP network did not work once web browsing starting working again.
So far, one provider wrote back to me saying that their servers are working.