WebFrame error, cuts off communications

We have implemented a webframe widget to load an external application with a softphone. To make the call the softphone connects through SIP over websocket and calls over WebRTC, but these communications are not established because apparently thingworx is cutting them (when making or receiving a call from the webframe). We have recently configured the ClickjackFilterAllowList options in the web.xml file but we still have the same problem, and calls from the softphone embedded in the thingworx webframe keep getting cut off. We are working with a thingworx 8.5 on an EC2 instance of AWS.