I've found that inbound IAX2 calls don't work reliably (i.e., I get a
busy tone) unless I enable "Use Consistent NAT" in the Sonicwall. This
feature is poorly documented by Sonicwall, so I thought I'd pass it along.
I've used the iaxcomm softphone and a snom 200 behind serveral different
sonicwalls over the past year or so without any problem. The sonicwall
should not be a problem for iax calls at all.
I think the problem occurs when an Asterisk server inside the firewall
tries to register multiple DIDs with one IAX2 provider outside the
firewall. The Asterisk server worked fine when it was connected outside
the firewall.
The Sonicwall TZ170s do handle SIP transformations very nicely, though,
if your Asterisk server is outside the firewall.
- Mike
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