[asterisk-users] NAT issue with Fortinet Firewall

[Peder @ NetworkOblivion]

FYI, I have probably 10 Fortinet units with multiple SIP phones behind 
each and all of the phones work flawlessly.  As long as the Fortinet is 
ver 3.0 or newer, it does NAT so that you don't need to have nat=yes on 
*.  No pinholes or static nat or anything, it just works.

As a side note, I probably have 20+ Cisco PIX's with the same setup and 
they work flawlessly too.  I've seen a lot of people saying "fixup sip" 
breaks phones, but not that I have seen.  I just let the PIX do nat and 
it works fine.

Carlos Chavez wrote:
> 	I have a customer with a Fortinet Firewall that is having stability
> issues with Asterisk and SIP endpoints (PAP2T) outside his network.  
> 
> 	The first issue I see is that Asterisk sees all phones as the IP
> address of the Fortinet.  Since the parameter "localnet" defines the
> local network and that address falls in that range, how will Asterisk
> treat the endpoints?  I have "nat=yes" for all phones and
> "canreinvite=no" as well.  The "externip" parameter is set to the
> outside public IP address.  Still we have calls with one way audio.
> 
> 	This is the first setup with a firewall that rewrites the IP address of
> the endpoint so I do not know how that is affecting the packet flow.  On
> my other servers I can always see the public IP of the endpoint.
> 
> 
> 
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