Hi, I often have issues where my SIP handset can't seem to connect to my FreeSWITCH server. I'm using Zoiper on iOS and the default freeswitch installation (freeswitch-meta-all) on Debian Buster. The configuration is mostly vanilla - I disabled mod_signalwire, enabled mod_flite and mod_erlang_event, changed the default password and set up an extension that uses mod_erlang_event but that's all. On the server ports 5060, 5070 and 5080 are open on TCP+UDP, ports 3478 and 3479 are open on UDP, and the port range 16384-32768 is also open on UDP. The server runs on a node on DigitalOcean. The issue I'm encountering is that sometimes my handset registers just fine, but other times I get timeout/unreachable errors. Nothing seems to change about the configuration though - I don't restart the server or anything like that. Also, I do see connection attempts on the server from unknown IPs (I'm assuming these are malicious bots trying to get into the system) - this suggests to me that the server is reachable. The system can be unreachable (to me) for days, but then be reachable for days. I have not been able to recognize a pattern. Does anyone have any suggestions what could be going on? Can it be something with my home networking setup? I would be happy to try a different SIP app if anyone has recommendations, it might be easier to debug this problem if I can get more verbose error messages than what Zoiper provides me with. Kind regards, Sam