Hello everyone!
I will try to explain the problem in the simplest way possible.
I currently have several Grandstream plants installed in different clients.
Most with Mikrotik router, some with another router of another brand (I don’t know if I can name it).
Until a while ago, by opening the ports on the router and some basic configuration, we could interconnect ucms peer to peer.
Today, for some reason that we cannot detect this connection, it stopped working with UCMS that have Mikrotik, but with those of another brand there is no problem.
We have already disabled the Sip Helper and the problem continues
I do not know if anyone has any paper with the configuration for Mikrotik to see if there is something that is not missing or knows what the problem is.
Sorry for my english! 