Gigaset A530 \ A540 stopped registering and updating in several offices in Russia. Local or global problem?

Question

SIP

It didn't happen at the same time, but in the same week.
SIP: Registration failed.
When trying to update the firmware, the server was not found.
At the same time, Panasonic and Grandstream feel great.
Is it just here or is it a global phenomenon?
All branches are on Mikrotik.

Answer 1

In general, the problem in my branch was solved by resetting sessions and rebooting the router. In the other, by replacing the patch cord. Two more branches changed their provider to RT - and it was Gigaset that fell off from them.
Nothing but the machinations of reptilians.