USRobotics/3Com make the highest quality dialup modems on the market.  
Just about anything else is susceptible to  the dialup ping-of-death, 
otherwise known as sending an ATH0+++ command through ping.  Internal or 
Externals are great, as long as they aren't 'winmodems' that require 
special software installed in order to operate.

An extremely detailed overview of how to get a modem configured to work 
in any flavor of linux can be found here:
http://www.tldp.org/HOWTO/Modem-HOWTO.html

Hope this helps,
-Scott

Patrick Fleming, EA wrote:
> I like Best Data modems. External serial and have worked with everything
> I ran. I picked mine up at Office Max.
> http://bestdata.com/index.php?file=c-all56k&iCategoryId=10
>
> George wrote:
>   
>> I needing a good Linux friendly (Debian - Xandros) 56K modem.  Any
>> good/bad stories (make model) I need to know about?
>>
>> TIA
>>
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