[Serusers] Firewall and NAT

[Nils Ohlmeier]

On Wednesday 23 July 2003 18:18, Director General: NEFACOMP wrote:
> I have got an H323 Mediatrix FXO gateway. It is not SIP based. May I use it
> with SER?
No.

  Nils

>
> Thanks
> Emery
> ----- Original Message -----
> From: "Klaus Darilion" <darilion at ict.tuwien.ac.at>
> To: "Rich Adamson" <radamson at routers.com>; <serusers at lists.iptel.org>
> Sent: Wednesday, July 23, 2003 15:38
> Subject: RE: [Serusers] Firewall and NAT
>
>
> I think its this way:
>
> FXO-interface: connects to the PSTN network an behaves like a normal phone
> the PSTN network.
>
> FXS-interface: connects to phone and behaves like a PSTN network to the
> phone (acts as a power supply for the phone).
>
> Simple scenario:
>
> Analog Phone <---> FXS + PC <----VoIP----> PC + FXO (=Gateway) <---->PSTN
>
>
> regards,
> Klaus
>
> -----Original Message-----
> From: Rich Adamson [mailto:radamson at routers.com]
> Sent: Wed 23.07.2003 14:23
> To: serusers at lists.iptel.org
> Cc:
> Subject: Re: [Serusers] Firewall and NAT
>
> > >We are using Check Point firewall I configured this
> > >server to allow both way in/out and NATED with public
> > >IP.
> > >For testing purpose I kept all ports opened in the
> > >firewall, for this particular server. I don’t why I am
> > >not able to register it.
>
> Might take a closer look at the Checkpoint to see if it is
> doing Port Address Translation (PAT) in addition to NAT.
> If I recall correctly, the older versions of Checkpoints
> software did PAT, which caused folks problems when an app
> wanted to use specific tcp/udp port numbers (for example,
> when trying to use an non-checkpoint VPN box on the inside
> of the checkpoint).
>
> > >Which is better PSTN gateway. We are looking at 1 to 2
> > >FXS port at this time for testing purpose.
> >
> > ? FXS is a PSTN-phone-2-IP gateway, isn't it? The most
> > popular is cisco's ata.
>
> Think the FXS is a Foreign Exchange interface intended to tie
> a ser-accessible gateway to a telephone/pbx line (not to a
> telephone instrument).
>
>
>
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