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* The default settings for chan_sip are now overriden properly by the general
  settings in sip.conf.  Please look over your settings upon upgrading.
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I have a feeling that the "nat=no" was not really having an effect on 11.4 but now it is in 11.5.  I would be curious to see what "sip show settings" said in 11.4 with your setup.

I would recommend using "nat=force_rport,comedia" in 11.5+ for your peers since that does work properly now and "nat=yes" has been deprecated.

Let us know if letting Asterisk use the default nat setting helps or not.
                
      was (Author: elguero):
    Filip,

So you have "nat=no" in the global section?  Can you try commenting that line out so that Asterisk uses the default nat setting?

In 11.5, CHANGES:
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