Bryan,
  I think you misunderstood what Jon was saying.  He wasn't saying that having DSL precludes FAX use, only that FAX's don't get sent via the Internet connection (without using a gateway).
You really can't send a FAX over the DSL line as *digital* data (without using a gateway), you have to send it over the (DSL)phone line as *analog* data.

Josef,
  Just plug your old modem into the (non-DSL)phone jack and use it for FAX with efax like you used to (just don't try to do the dial-up, your ethernet port and DSL box take care of Internet).
DSL doesn't really change how you send FAX's from what you used to do in the dial-up world.  It just splits the Internet part of your connections to a different (and much faster) port.

Bryan O'Neal wrote:
> Just out of curiosity, why not?  If I can use an old school voice phone
> to send regular voice data down a DSL line using a filter, why can I not
> send a fax?  After all it is just the same as a voice phone call.  All
> the fax or modem does is push the data across in a standard set of
> audible tones, no different then a voice call.  The only thing I can see
> is if they compressed the voice channel so much that the tones can not
> be correctly received, but then you should notice a difference in the
> voice quality to right?
> 
> I remember really old school modems and fax machines that did not even
> plug into the wall, they just had a mike and speaker you set your phone
> hand set on.
> 
> I can send faxes with my Cox digital phone at home and at work I have
> old school faxes going through an IP based PBX and over a T1, I would
> think you could send one over DSL but never had a chance to try it.  I
> would love to know what is going on that would prevent it.  (And this is
> the place with people in the know ;)
> 
> -----Original Message-----
> From: plug-discuss-bounces@lists.plug.phoenix.az.us
> [mailto:plug-discuss-bounces@lists.plug.phoenix.az.us] On Behalf Of Jon
> M. Hanson
> Sent: Friday, March 16, 2007 6:58 PM
> To: Main PLUG discussion list
> Subject: Re: How to send a fax via DSL?
> 
> You have to send a fax via a voice phone line and modem. You cannot send
> a fax via DSL unless you use one of those Internet fax gateways but
> those can be used by any Internet connection not just DSL.
> 
> ------- Original Message -------
> From: "Josef Lowder" <joe@actionline.com>
> To: plug-discuss@lists.plug.phoenix.az.us
> Sent: 03/16/07, 01:21:11 PM
> Subject: How to send a fax via DSL?
> 
> .
> When I had a dial-up modem rather than a dsl connection, 
> I was able to send faxes from the command line via modem
> using a program called 'efax'.
> 
> But now that I am connected via DSL, I wonder how I can 
> send a fax, since there is no dial tone?
> 
> What is the solution?
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