I experimented a little bit and Asterisk behind NAT with SIP works. I created an account at iptel.org and use that account for outbound SIP traffic from
Asterisk.
I can confirm that Asterisk behind NAT can call out to IPtel.org ...and users connected to iptel.org can call me, if my server is registred to iptel.org.
As stated earlier, the iptel.org SIP express router is configured with a development version of the nathelper module, that assists SIP clients inside a NAT to keep sessions open, allowing incoming calls. In this configuration, Asterisk is simply just another SIP phone, seen from iptel.org's point of view.
I'll update the information on the wiki so you can experiment with this.
Thank you, Jan Janak @iptel.org, for testing with me!
/Olle
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