asterisk <-> nat <-> nat <-> sip client = big pain in the neck.
I have never managed to get this to work. Getting the below
was trouble
enough. Forget about trying to get an asterisk box behind a
nat to work
with clients outside.
asterisk <-> nat <-> sip client.
Yes, you will need a specific SIP iptables filter for this to
work from behind a firewall.
Getting it to work with a firewall is not a problem...it is getting the
thing to work with a natting firewall that is the problem. If one end is
natted, you can still do some tricks to get it to work but if both ends
are natted, forget it.
I know of an H.323 filter, but haven't explored SIP as we aren't
running any SIP application here yet.
Another possibility would be a SIP proxy installed on the
firewall, but it is not as secure as a filter.
asterisk IS a sip proxy.
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