I have tried it, but with no result for topos module. For topoh it works. But in me config I using fix_nated_contact();
Daniel, please look at line 1202 form debug output, in that line: Contact: sip:12345@11.22.33.44:48418;transport=TLS with correct port, but topos does not use or does not see it...
If you need more debug info please let me know.