We have noticed an issue on our BigBlueButton servers where people using WebRTC and Firefox 34-beta can send their audio, but they aren't receiving any audio back. It looks like Firefox is sending "c=IN IP4 0.0.0.0" in the SDP, whereas in previous version of Firefox it would provide an IP address on the c line. Is it possible that Freeswitch sees the 0.0.0.0 in the SDP and chooses to just receive only? We are seeing this problem on both Windows and Mac machines. The full client log can be found here, http://pastebin.com/8JX3PwEP, and the output from fs_cli can be found here, http://pastebin.com/8nuF5e8e. We use sip.js in the browser and I had originally posted the question to their mailing list and the change in the "c" line was pointed out there. My post can be found here, https://groups.google.com/d/msg/sip_js/tuGdbE4ryWs/dKu-KfUlSYEJ. Any assistance would be greatly appreciated. Chad