SER, the SIP Express Router, version 0.8.11 have a new solution for supporting NAT, the nat helper module.
See http://www.voip-info.org/tiki-index.php?page=SER+nat+support
It mangles the SIP header, the SDP and also actively keeps the NAT assosciation for clients behind NAT open in order to be able to set up calls to them.
I think a lot of people are interested either in * Documentation on how to set up SER as a frontend to Asterisk for NAT clients * Port of this module (it's open source) to Asterisk
If I could do it, I would be hacking now...
/Olle
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