[Freeswitch-users] NAT traversal - the final say..!

Cal Leeming [Simplicity Media Ltd] cal.leeming at simplicitymedialtd.co.uk
Fri Jan 18 17:31:06 MSK 2013

Hi all,

Thanks for everyones feedback on this, there's a lot of really useful info
and this will make life much easier when writing the docs.

I'm hoping to make a start on this within the next month (mod_xml_curl and
mod_event_socket are first in my list).

Of course, others are more than welcome to contribute as well :)


On Thu, Jan 3, 2013 at 4:12 PM, peely <freeswitch at peely.com> wrote:

> IMO as a provider, FS does an excellent job at detecting NAT on its own and
> handling it. We've rarely had any issue with our end sending INVITEs to the
> wrong place or one / no way speech. connectile dysfunction does nothing
> more. The only switch we enable is one to enable the SIP options ping and
> to
> use sip-force-expires to reduce the time the endpoint re-registers for
> mobile devices.
> As with others on this thread, the ALG in most routers is the culprit, I've
> rarely experienced one which does anything beneficial, most screw up the
> headers.
> We also recommend that customers change the SIP port on their handsets to
> anything other than 5060, older BT routers especially seem to stop
> forwarding responses after a few minutes, again as they have a very basic
> ALG. Using port forwarding in the router is the only sure fire way of
> getting reliable SIP through to a handset, Draytek routers seem to be
> pretty
> flaky until you do this or use TCP / TLS.
> If the router stops forwarding packets because of a poor ALG implementation
> or other firewall rules, nothing FS can do will overcome this.
> --
> View this message in context:
> http://freeswitch-users.2379917.n2.nabble.com/NAT-traversal-the-final-say-tp7585562p7586032.html
> Sent from the freeswitch-users mailing list archive at Nabble.com.
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