Jingle nat traversal

Has ANYONE been able to get Jingle to work with a symmetric nat? I just feel that the rtpbridge is there but it doens’t work at all. I’ve tried many different nat combinations to get it to work and it’s still useless. It works on the local network and through a Full Cone nat using stun. This is important for the program I’m working on and I need to know whether or not I should keep using jingle or search for something else at this point.