[asterisk-users] PJSIP and NAT behind a dynamic IP address

[Scott Griepentrog]

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 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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Scott Griepentrog
Digium, Inc · Software Developer
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