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[jeff at ocjtech.us]

What should the PJSIP configuration be if your external IP address is
dynamic, as is common with most home networks, and probably a lot of
small business networks as well? The external_media_address and
external_signaling_address transport settings are static. It would be
possible to write a script that would detect the external IP address
and rewrite the pjsip configuration file, but since you can't change
transports without a full restart of the server that doesn't seem very
friendly. Is the only alternative to rely on your firewall/router to
fix up the address in the SDP?

--
Jeff Ollie

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[sgriepentrog at digium...]

If you review the current asterisk 12 sample pjsip config for extension 6002 (viewable here: http://svnview.digium.com/svn/asterisk/branches/12/configs/pjsip.conf.sample), you will find it contains the correct settings for an endpoint behind NAT.  Specifically note that you need rewrite_contact enabled so that the contact address is rewritten to match the inbound SIP registration, and also with rtp_symmetric enabled to do the same thing for RTP.


Also be aware that you will have less problems by omitting the transport= line from the endpoint configuration altogether.  It's generally not required to define that the endpoint is restricted to using a specific transport, and doing so interferes with the automatic transport selection, possibly including the symmetric SIP operation.


On Wed, Oct 22, 2014 at 9:13 PM, Jeffrey Ollie <jeff@ocjtech.us (jeff@ocjtech.us)> wrote: