asterisk users - Oct 2014 - PJSIP and NAT behind a dynamic IP address

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

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 transportline
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 at ocjtech.us> wrote:
> 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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