There are open bugs in Bugzilla against this Fedora package (libnice): bug #1432456 bug #1438620 bug #1516442 bug #1536871 There has been no progress made since those bugs were created. Could you please respond on those bug reports?
Haven't had time to do any work for Fedora, so it's best I just orphan this. And someone else can pick it up if they're interested.
Thanks! I have created the following releng issue for that: https://pagure.io/releng/issue/7279
Almost all bugs are resolved. Bug #1516442 needs more information to proceed.