WebRTC drops call after 30 seconds

So WebRTC/UCP drops my call after about 30 seconds, inbound and outbound. It is running on HTTPS, but as Andrew Nagy has said:

Would anyone know if WSS is required for this to work? Here is the part of the “full” log that might be what I think explains the issue, but I’m not sure how to get around it…

[2015-03-31 14:32:01] WARNING[37078][C-00000000] res_srtp.c: SRTP unprotect failed with: authentication failure 10

I guess I assume this can’t be supported until WSS is available?