Effective: January 1st, 2026

Network Requirements

Real-time communication relies on a combination of secure control channels and media transport. Network configurations must allow outbound communication on specific protocols and ports to support session signaling, audio/video media, and related browser traffic.

Allowed Traffic Requirements

The following types of traffic should be permitted for proper operation:

  • Secure control and signaling: HTTPS and secure WebSockets over standard HTTPS port (TCP 443)
  • Real-time media transport: User Datagram Protocol (UDP) on media ports (often used for video and audio)
  • Fallback: When direct UDP media transport is blocked, encrypted transport over TCP (TLS) should be permitted

Required Domains and Ports

To support the network traffic for control, signaling, and real-time media, the following should be permitted on outbound connections:

  • HTTPS control and session setup: TCP 443
  • Media transport (UDP): UDP 3478 and higher ephemeral UDP ports
  • Domains used by the communication backend must be reachable without restrictions in DNS and firewall settings

In corporate environments, allowlisting relevant domains or ranges may be required to ensure connectivity through firewall and proxy devices. Blocking these ports or domains may prevent sessions from establishing properly.

Bandwidth Requirements

DLEGATE uses real-time audio, video, and data transmission technology that dynamically adapts to network conditions. To ensure a stable experience and consistent media quality, the following bandwidth guidelines are recommended. Actual bandwidth usage may vary depending on video quality, number of participants, and session activity.

Audio

  • One-to-one audio session: approx. 50–60 kbps upstream and downstream
  • Multi-participant audio: additional downstream bandwidth per participant may be required

Video

  • Standard video (1:1): approx. 600–700 kbps upstream and downstream
  • High-definition video (if enabled): up to 1.4 Mbps upstream and downstream
  • Small group sessions: additional downstream bandwidth per visible video stream
  • Larger group sessions: reduced per-stream bandwidth through adaptive video scaling

Screen Sharing

  • High-quality screen sharing: up to 1.2 Mbps upstream and downstream
  • Adaptive or reduced-quality sharing: from 300 kbps depending on content

General Recommendations

  • Stable broadband or LTE/5G connection
  • Low latency and minimal packet loss
  • Wired connections recommended for Inspectors where possible

For enterprise or managed networks, sufficient bandwidth should be reserved to accommodate concurrent sessions and peak usage scenarios.

Corporate Networks and Security Devices

In enterprise environments, additional factors can impact connectivity:

  • Firewalls that block outbound UDP traffic can prevent media transport
  • Proxies must support secure WebSockets and TLS inspection if enabled
  • Virtual Private Networks (VPNs) and deep packet inspection (DPI) can affect real-time media quality

If issues occur, work with your network administrator to verify that required traffic is allowed. Many networks block or filter real-time protocols by default; explicit configuration may be needed.

Troubleshooting Tips

If network-related errors occur during media sessions:

  • Check that your firewall allows outbound TCP 443 traffic
  • Verify that UDP ports (such as 3478 and ephemeral UDP range) are permitted
  • Confirm that DNS resolution is working for relevant domains used by the communication service

Some corporate networks may require tests from both internal and external networks to validate connectivity. If problems persist, consult your network team for further analysis.

Related System Requirement Sections

For a complete overview, please also review:
End User Devices
Browser Requirements
Hardware Requirements