Video Conferencing

Language note: Media and interface labels remain in their original language. Firewall domains and rules are preserved exactly.

Introduction

To ensure a seamless experience in environments with restrictive firewalls (such as schools and universities), access must be allowed to the services of AWS Chime SDK, our video conferencing provider. This guide provides step-by-step instructions for unblocking the essential domains and ports.

Important: If you are not a network administrator, share this document with your institution’s IT department.

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Why Do I Need to Allow Access Through the Firewall?

Firewalls in educational institutions often block connections needed for real-time audio/video transmission. Without these exceptions, you may experience:

• ❌ Frozen video or audio
• ❌ Connection errors (“Não foi possível se conectar à chamada” — Unable to connect to the call)
• ❌ High latency (communication delays)
• ❌ The platform failing to load

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What Needs to Be Allowed?

Domains (Allowlist)

Add these domains to the firewall exceptions:

*.chime.aws
*.chime.aws.amazon.com
*.amazon.com
*.amazonaws.com
*.aws.amazon.com
*.s3.amazonaws.com
*.s3.<sua-regiao>.amazonaws.com  (ex: s3.sa-east-1.amazonaws.com)
*.chimevideoconf.com

Note: Replace <sua-regiao> with your institution’s AWS region (e.g., sa-east-1 for Brazil).

Ports (TCP/UDP)

Allow traffic on the following ports:

Protocol	Ports	Purpose
TCP	443	Secure connection (HTTPS/WebRTC)
UDP	3478, 3479, 3480, 3481	Media transmission (audio/video)

Important: Blocking UDP ports directly affects call quality. Prioritize allowing them!

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Step-by-Step Configuration

For Network Administrators

Follow these steps on your institution’s firewall:

1. Open the firewall control panel (e.g., Fortinet, Cisco, pfSense).
2. Create a new outbound rule with the following settings:
   • Action: Allow
   • Direction: Outbound
   • Protocols: TCP and UDP
   • Destination ports:
     • TCP: 443
     • UDP: 3478, 3479, 3480, 3481
3. Add the domains to the allowlist:
   • Enter all the domains listed in the previous section.
   • If the firewall requires IP addresses, consult the AWS IP address ranges list (search for CHIME and AMAZON).
4. Apply the rules and restart the firewall if necessary.

For Teachers/Students (Without Firewall Access)

Send this email to your IT department:

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Subject: Request to allow firewall access for Slingui.com video conferencing

Dear IT Department,

To use the Slingui.com video conferencing tool in our academic activities, we request that the following settings be allowed through the firewall:

Domains to allow (allowlist):

*.chime.aws
*.chime.aws.amazon.com
*.amazon.com
*.amazonaws.com
*.aws.amazon.com
*.s3.amazonaws.com
*.s3.sa-east-1.amazonaws.com
*.chimevideoconf.com

Ports to allow:

Protocol	Ports
TCP	443
UDP	3478, 3479, 3480, 3481

These exceptions are essential for AWS Chime SDK, the technology used by Slingui.com, to work. Further technical details are available in the AWS documentation.

Thank you for your attention. We remain available for any clarification.

Kind regards,
[Your Name/Department]
[Educational Institution]

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Verification After Allowing Access

After allowing access, test the connection:

1. Open Slingui.com’s video conferencing tool.
2. Start a test call (if available) or join a meeting.
3. Check that:
   • ✅ Audio and video stream without interruptions.
   • ✅ There are no connection error messages.
   • ✅ Latency is low (move in front of the camera to test).

If Problems Persist:

• Confirm that the rules were applied to all network segments (Wi-Fi, labs, classrooms).
• Check whether the firewall is blocking traffic at higher layers (e.g., SSL/TLS inspection).
• Contact Slingui.com support.