Re: [hylafax-users] FOIP?

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2004.03.05 08:15 Peter Halliday wrote:
> Lee,
>
> It sounds like OpenH323 is used to create the virtual modems, and a
> cisco
> gateway is needed.  HOwever, I'm not sure where the modems come in, or
> are they
> not needed?

I am by no means a VoIP/FoIP expert.  So I can only try to share 
information that I think I've learned about this.  There are others on 
this list, however, that *are* VoIP/FoIP experts and some even use 
t38modem regularly.  So understand I may be dead-wrong here, but...

With VoIP/FoIP the communication happens over the IP network (be it 
your LAN, WAN, or internet).  The IP communication happens directly 
between VoIP/FoIP device end-points (t38modem-to-t38modem, for 
example).  If a call needs to go out to the POTS, then one end-point 
must serve as a "gateway".  Cisco makes these.  I think that an 
Asterisk box will even serve this purpose, too.

The t38modem provides an interface between the FoIP/VoIP IP network and 
the DTE (HylaFAX).  It is a DCE (modem), but is completely software.  
Think of it as a "driver" to use your network card as a modem.

So if you never need to reach the POTS, then no, you don't need any 
traditional modem.  If you do need to reach the POTS, then yes, you'll 
need a gateway somewhere on the IP network.

Lee.

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