07-14-2026, 12:20 PM
(This post was last modified: 07-14-2026, 12:20 PM by Datadynamics.)
If VoIP traffic is being blocked or restricted, the first step is to identify where the issue is occurring. In many cases it's related to firewall rules, SIP ALG, NAT configuration, or ISP-specific network behavior rather than the VoIP service itself. Checking SIP registration, disabling SIP ALG (if available), and testing SIP over TCP or TLS can often help resolve connectivity issues. It's also a good idea to review router logs and confirm that the required SIP and RTP ports are being handled correctly before assuming the problem is with the provider.