From: dplatt@radagast.org   
      
   In theory, VOIP can carry fax transmissions, but in practice   
   it does not work very well.  You need to be using a simple   
   codec (alaw or ulaw) and have very little timing jitter   
   in your network path... otherwise there will probably be   
   enough waveform distortion to corrupt the fax transmission   
   badly.  Other types of modem-over-VoIP have similar   
   problems.   
      
   Some VoIP providers have the ability to detect a fax handshake   
   in an incoming call, terminate the call to a faxmodem, and   
   forward the fax to you via email... and may provide an   
   email-to-outbound-fax origination service as well.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)