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Hi everyone, I've recently moved my office to a larger building and am trying to set up a VOIP call center. The phones are SNOM D785, and they work just fine when connected straight to the modem/router. However, when I connect them behind my firewall they fail to register. Vodafone is being super uncooperative and my IT support company has already charged me ~350€ and one passes the ball to the other. Does anyone have any idea of what settings need to be applied to the firewall? It's a Sophos firewall running on a Proxmox VE. The connection chain is Modem -> Firewall -> TPLink switch. The phones do get assigned an IP, and the computers do have internet access when connected wall-phone-pc Any ideas would be greatly appreciated 🙏