On Thu, 2009-06-11 at 16:36 -0400, Damian Krzeminski wrote:

> >> Also what type of advise should we be giving to administrator: should
> >> sipXbridge be always used as default SBC for entire network? Even if there
> >> are no trunks configured?
> > 
> > Not sure how or why this relates to selecting sipxbridge in the case
> > under discussion. If the user selects sipxbridge as the default
> > gateway in the pulldown menu then internet calls ( regardless of
> > domain ) will be sent there.
> > 
> > 
> 
> Let me explain what I mean: in 3.10 if you wanted your URL calls to work
> you had to enable Internet Calling and configure default SBC. (Otherwise
> your calls would bypass SBC that among other things provided NAT traversal).
> 
> It seems to me that in 4.0 it's not really needed since NAT traversal built
> in the proxy just takes care of that. And what we do instead in 4.0 is to
> tell administrators to enable internet calling if some other, more
> complicated calling scenarios, fail.
> 
> What I am trying to find out is: should we just advise administrators to
> enable internet calling in all cases? only specific cases?

Unfortunately, I think that the answer is "it depends", or, more
specifically, it depends on what works through the
firewall/nat/relay/vpn/filter infrastructure of the customers network.

The advantage of the sipXbridge is that if it is working for an ITSP
then it should also work for calling some other arbitrary domain (unless
the firewall has been told to restrict what it can call or be called
by... see previous paragraph).  At the very least it will work at least
as well as sending the call directly from the proxy, and possibly
better. 


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