Stephane M wrote:

> Thanks guys for all this information...
>
> But I think about companies, which want to install a VoIP system....
> that seems to me not really suitable for companies..

It Depends. What are you intending to use VoIP for? Trunks or handsets? VoIP
handsets happily share a LAN with a few PCs, and for more complex
environments you can use VLANs to get what you want.

> you can't ask people to stop downloading while phoning :-)

You can't, but then if your VoIP is running over ADSL in the UK, lack of
downstream bandwidth is unlikely to be an issue - it's more likely to be
lack of upsteam bandwidth. And egress is a lot easier to control than
ingress.

> So, I can't really see any possibility for professional use... Seems to
> be a bit dodgy !??

It'll only be as good as the quality of the connection, and the amount of
available bandwidth. As others have mentioned, SIP+RTP uses a variety of
ports so it can be a bit of a fuck on to get it set up right. You might
find it easiest to prioritise traffic from specific hosts [ie your
handsets] over everything else.

> I installed in the company an FVX538, thinking that I would be able to
> use VoIP systems...

If you're using VoIP to save costs, then you're going to need to make a lot
of calls to save £200!

> So, the only solution would be the CTX1000 ???

There are probably others. You could get a dedicated DSL circuit at each end
for VoIP trunks, which would make some kind of sense given that you've got
a dual-WAN firewall. But of course that may well eliminate any cost
benefits of using VoIP.

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Yes. I'm just guessing.