In traditional deployment, RTP relays are mostly always offered via proxy. TURN offer a client built-in alternative to remove this requirement.
Traditional deployment usually conflicts with usage of TURN because a nice deployment would require ALL app to support ICE and TURN and be configured with it. Additional provisioning and configuration is also a headache for common users. Thus, we won’t be surprised if it is not activated in most cases.
However, it’s nice to know that a full ICE deployment is possible. Additionally, this was a feature required for better interoperability with webrtc! – Offering also new usage and deployments… –