Video: Network Requirements for Firewalls and Web-Filters

If your school or Local Authority has a firewall, or teachers are remotely using the school's network at home via a proxy, you may need to make changes to allow the video call connection. This article explains the hostnames, IP address ranges and ports that are needed for a successful video call. The video call connection is made directly between the teacher and the parent.

Endpoints to Whitelist

Last updated: 20th November, 2023

Please allow access outbound to all the following hostnames and IP address ranges and ensure inbound traffic is allowed in response to the outbound connections.

Ensure HTTPS inspection is bypassed for the following hostnames and traffic allowed over TCP 443:

twilio.com

global.vss.twilio.com

sdkgw.us1.twilio.com

Also allow outbound traffic to the following IP address ranges over TCP 443 + UDP 3478 + UDP 10,000 - 60,000:

168.86.128.0/18
13.210.2.128 - 13.210.2.159
54.252.254.64 - 54.252.254.127
3.25.42.128 - 3.25.42.255
18.231.105.32 - 18.231.105.63
177.71.206.192 - 177.71.206.255
18.230.125.0 - 18.230.125.127
52.59.186.0 - 52.59.186.31
18.195.48.224 - 18.195.48.255
18.156.18.128 - 18.156.18.255
52.215.253.0 - 52.215.253.63
54.171.127.192 - 54.171.127.255
52.215.127.0 - 52.215.127.255
3.249.63.128 - 3.249.63.255
52.66.193.96 - 52.66.193.127
52.66.194.0 - 52.66.194.63
3.7.35.128 - 3.7.35.255
13.115.244.0 - 13.115.244.31
54.65.63.192 - 54.65.63.255
18.180.220.128 - 18.180.220.255
13.229.255.0 - 13.229.255.31
54.169.127.128 - 54.169.127.191
18.141.157.128 - 18.141.157.255
34.203.254.0 - 34.203.254.255
54.172.60.0 - 54.172.61.255
34.203.250.0 - 34.203.251.255
3.235.111.128 - 3.235.111.255
34.216.110.128 - 34.216.110.159
54.244.51.0 - 54.244.51.255
44.234.69.0 - 44.234.69.127

Running a Test

Please access the following website to run a test, and allow access to your microphone/camera: https://video-diagnostics.twilio.com//

Bandwidth Requirements

Video calling should adapt to the available bandwidth. The recommended bandwidth for video calls for popular video conferencing solutions tends to be around 1-3 Mbps in/out per call, and we would recommend considering this as a guide.For example: with 50 simultaneous video calls being made on the school's network, you could expect to use 50-150 Mbps bandwidth in/out.

Points of Note

As media traffic flows over UDP, we STRONGLY RECOMMEND that you ensure any policies which would drop UDP packets, such as UDP flood prevention, are turned off. Any network device which drops UDP packets would cause the video and/or audio to stutter.