[asterisk-users] Using SIP with NAT (technical code question)

[jezzzz .]

My mistake, I misread it. So if a hostname is provided
(e.g. user at domain.com) instead of an IP (e.g.
123.123.123.123) and the recipient of the INVITE is
not using NAT then ast_gethostbyname will be run - is
that correct? In this case, why the distinction
between a NATted and non_NATted implementation?

--- Bob Chiodini <bchiodini at gmail.com> wrote:

> It looks to me that if the test clause is false then
> 
> ast_gethostbyname is called.  Presumably not needed
> when NAT is enabled.
> 
> Bob...
> 
> jezzzz . wrote:
> > In chan_sip.c, line 5876 (Asterisk-1.2.13), the
> > function parse_ok_contact returns whether the host
> > that requested an invite is a valid or invalid
> host.
> >
> > In line 5925 the following clause is tested:
> >
> > if (!(ast_test_flag(pvt, SIP_NAT) &
> SIP_NAT_ROUTE))
> >     hp = ast_gethostbyname(n, &ahp);
> >
> > If this clause is true then Asterisk will attempt
> to
> > retrieve the IP address by using the hostname
> provided
> > in the invite.
> >
> > My question is, is this test always going to be
> true
> > if a user (who receives the invite) uses NAT?
> (this is
> > set up in sip.conf as nat=yes) Is there a reason
> why
> > this was set up only for NAT? 
> >
> > Thanks,
> >
> > Jez
> >
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