Techniques are provided for modifying a list of Traversal Using Relays around Network Address Translators (TURN) servers within a host application. A custom-modified browser is configured to add and/or remove TURN servers underneath a variety of host applications, including, for example, JavaScript WebRTC applications. In some cases, certain applications are permitted and/or denied use of certain TURN servers, based on local administrative policy. In accordance with another embodiment of the present disclosure, a host application can be configured or otherwise modified to use certain TURN servers on certain networks, for example, to prevent traffic from using a TURN server outside a General Data Protection Regulation (GDPR) region.