The article provides developer guidance for connecting to Vivox servers through firewalls, specifying destination IP ranges and TCP/UDP ports.
Destination port ranges
All communications start as outbound communications from the client and only require that a firewall allows communication back on the same UDP port.
- TCP: 443 - for web server (HTTPS)
- UDP: 12000 - 52000 - for voice media (RTP)
Subnets
The following list is current as of September 04, 2025.
85.236.96.0/21 85.236.104.0/23
Note: A single environment has multiple backend components that could change IPs without warning.
Advice
Please review and apply exceptions for this list carefully, including the mask. In the past we have seen firewalls which intercept 'web' SSL traffic and block XMPP as not permitted, so exceptions must be made. Please also keep in mind that even if one type of machine on the network works normally (consoles or PC), it does not necessarily mean that firewall restrictions aren't in play to prevent connections from the other machines.