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The CCP is a web app with a telephone inside — Learn it in 5 minutes
About five minutes of reading
Sign-in can succeed when media cannot. Those are different allow lists.
Signaling and the UI use TCP 443 to the instance, CloudFront, and the transport domains. Media uses UDP 3478 to TurnNlb. The docs recommend Option 1, the domain list, and ask you to test more than 200 calls.
VDI and VPN are the usual reasons a lab works and the floor does not. Media should go directly to AWS.
- Supported browsers only. A locked-down browser without WebRTC permissions fails closed.
- Headsets with their own DSP can still be fine. Browser permission for the microphone is not optional.
- The Endpoint Connectivity tool is the first test, before a packet capture.
- Stateless firewalls need ephemeral UDP back in.
Number on this page: Test size 200. Calls before you trust a new proxy
Sources and go deeper
- How Contact Control Panel (CCP) uses WebRTC - Amazon Connect Customer AWS docs. last checked 2026-10
- Set up your network to use the Connect Customer Contact Control Panel (CCP) - Amazon Connect Customer AWS docs. last checked 2026-10
- GitHub - amazon-connect/amazon-connect-streams: Amazon Connect Streams - a browser-based contact center integration API, typically with CRM systems. · GitHub community. last checked 2026-10
- RFC 8825: Overview: Real-Time Protocols for Browser-Based Applications | RFC Editor RFC. last checked 2026-10
- RFC 5766: Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN) | RFC Editor RFC. last checked 2026-10
- RFC 6455: The WebSocket Protocol | RFC Editor RFC. last checked 2026-10
- WebRTC - Wikipedia Wikipedia. last checked 2026-10