31530: DNS Resolution Error

This indicates that the Voice client could not connect to the server.

• Your network is restrictive or uses a VPN, and ICE gathering cannot reach Twilio from all available interfaces.
• Your firewall blocks the outgoing UDP traffic required for Twilio Voice media, or it does not allow the Twilio signaling and media destinations your SDK needs.
• You are connecting from a restricted network without providing ICE servers from Twilio Network Traversal Service.

• Enable enableIceGatheringOnAnyAddressPorts in ConnectOptions so ICE candidates are gathered from all available interfaces on Android or iOS.
• Provide ICE servers from Twilio Network Traversal Service through ConnectOptions or AcceptOptions when your network requires TURN.
• Allow outgoing TCP and UDP traffic to Twilio's signaling and media infrastructure, or use TURN over TCP or TLS if UDP is restricted.

• Voice SDKs Network Connectivity Requirements
• Voice Mobile SDKs: Best Practices