In jitsi's own videobridge project,https://docs.google.com/document/d/1iMOvIFBDSPSkL1_dfhND_mXvf3luIex9hepeIpTuLkw/ pub, you can edit the file "~/.sip-communicator/sip-communicator.properties ".This config can help these servers behind NAT.
and the openfire 's jitsi videoBridge plugin folder also has a file name "sip-communicator.properties", but it is not work. The log shows as follow:
net.java.sip.communicator.service.protocol.OperationFailedException:Could not establish connection (ICE failed)
how can i let it work?