Troubleshooting: Error 20003 – High Round-Trip Time (RTT)
Technical Breakdown
| Code | 20003 |
| Type | Warning / Error |
| Category | Media (Latency) |
| Message | There’s a high round-trip time measured. This can lead to poor call quality. |
What is this about?
Round-Trip Time (RTT) is the duration it takes for a data packet to go from your device to the media server and back. High RTT indicates significant latency in your connection.
[Image of network latency round trip time diagram]
The primary causes for this delay include the physical distance between you and the server, or network “bottlenecks” created by VPNs or inefficient ISP routing.
Potential Risks
High latency causes noticeable audio/video lag, making natural conversation difficult. In severe cases, poor routing can trigger secondary issues like packet loss and low bitrates, making the video blurry or frozen.
Suggested Actions to Take
- Disable VPNs: VPNs often route traffic through distant servers to encrypt data, adding unnecessary distance to your signal. Turn off your VPN and re-test.
- Check Media Server Region: Ensure your application is connecting to the geographically closest server (e.g., if you are in New York, you shouldn’t be routed to a server in Europe).
- Evaluate ISP: Some Internet Service Providers have better “peering” (direct connections) to major cloud networks. If RTT is consistently high on all devices, your ISP’s routing may be at fault.
- Use Wired Connection: Switching from Wi-Fi to an Ethernet cable can often reduce local latency and “jitter.”
[Image of VPN traffic routing vs direct internet connection]