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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>From my study on the matter, relay (Cisco or T.38) is absolutely
better if passing through any type of WAN link or other type of link where
latency or jitter can be an issue, or if you want to support the fastest speeds
in faxing. Since relay is IP, and was designed with the potential unreliability
of IP in mind, it can handle that type of issue in a much cleaner method.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It is also potentially important if you have a fax server that
uses IP, as it will likely use T.38 (it is important for analog VoIP ports to
support T.38 in this case if you want to allow internal faxing between an
analog port and a fax server, and you will need gateway support enabled at a
minimum).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Passthrough is easier to implement (and less likely to encounter
bugs), but more prone to network issues, as it is simply passing the analog
signal (and fax/modem is much more sensitive to any disruptions to the signal),
and is supported on more equipment in more protocols (for example last I
checked standards based T.38 isn’t supported with SCCP gateways, only MGCP and
H.323). Also, the ATA-186 (not the best box for faxing anyways) only does
passthrough.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Personally I ended up using standards based T.38 wherever possible
(I have 2 ATA-186s doing faxing at this point, although I have plans to change
that) to ensure consistency for our fax setup, since we do have a fax server
and remote sites on WAN links.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Matthew Ballard<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Network Manager<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Otis College of Art and Design<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On
Behalf Of </b>Lelio Fulgenzi<br>
<b>Sent:</b> Monday, April 19, 2010 10:49 AM<br>
<b>To:</b> cisco-voip voyp list<br>
<b>Subject:</b> [cisco-voip] advantages of fax relay over fax passthrough?<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>can anyone help me understand
the advantages of fax relay over fax passthrough.<br>
<br>
From what I gather, if our network is high speed, low latency, low jitter, we
should look at using passthrough since it's the easiest to configure.<br>
<br>
Why should I use fax relay?<br>
<br>
---<br>
Lelio Fulgenzi, B.A.<br>
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1<br>
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>
Cooking with unix is easy. You just sed it and forget it. <br>
- LFJ (with apologies to Mr. Popeil)<o:p></o:p></span></p>
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