[Asterisk-Users] Using frequent keepalives to eliminate need forNAT port forwarding?

[Damon Estep]

Qualify=yes will send a SIP OPTIONS periodically and keep the NAT open,
if you use 1 to 1 NAT (versus PAT where it is "many to one NAT") it will
work because port 5060 on the private address will still be port 5060 on
the public address.

With PAT the port could be anything over 1024, but usually much higher,
and the originator will send to port 5060, which your NAT router will
drop.


> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Tom Engleward
> Sent: Monday, May 01, 2006 6:25 PM
> To: asterisk-users at lists.digium.com
> Subject: [Asterisk-Users] Using frequent keepalives to eliminate need
> forNAT port forwarding?
> 
> I have an asterisk system behind NAT, and need to
> connect to public PSTN originators via SIP or IAX2,
> but don't have the option of forwarding any ports
> (4569, 5060, etc) to the asterisk system. However, the
> NAT system does properly establish transient UDP
> forwarding on the basis of outgoing connections, so is
> it possible to configure asterisk to send frequent
> keepalive UDP packets (say every 30 seconds) from
> ports 4569 and 5060 to the PSTN originators in order
> to keep the NAT system's transient forwarding in
> effect, so that when the PSTN originator receives
> inbound calls and attempts to contact my asterisk
> system, the NAT system won't drop the packets?
> 
> 
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