In order for Skype for Business to function properly, the following network ports need to be open OUTBOUND through the network firewall.
Ports:
| Port | Protocol | Direction |
| 443 | TCP | Outbound |
| 3478 | UDP | Outbound |
| 5061 | TCP | Outbound |
| 50000-59999 (Optional) | TCP/UDP | Outbound |
IP Addresses:
Our IP Addresses are as follows. We would recommend allowing all IP's through your firewall. This will allow your users to utilise local resources if they host meetings closer to a different region.
| Site | IPv4 Subnet | IPv6 Subnet | Address Range (Inclusive) |
| Global (London) | 185.94.204.0/22 | 2a04:e9c0::/29 | - |
| North America (California) | - | 2600:1f1c:353:7600::/56 | 13.56.32.160-13.56.32.175 |
| Asia Pacific (Singapore) | - | 2406:da18:c3c:cc00::/56 | 13.228.64.64-13.228.64.79 |
| Asia Pacific (Sydney) | 103.116.111.0/24 | 2001:df5:5100::/48 | - |
URL's:
*.unifiedcaas.net
*.joinvia.com
*.via.co.uk