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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Warning for the ISR G2 routers. I have a 2921 trying to do T.38
faxing directly from FXS to PRI port using H.323. The ISR G2 routers do not
support Cisco Fax Relay. I had the standard T.38 configuration but Faxes were
failing. The Gateway was trying to use Cisco Fax Relay (IOS vs. hardware/DSP
support) but the gateway/DSPs aren’t able to do it. Fix is “fax
rate disable” on the dial-peers.<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'>Bug ID CSCtc98074<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'>I’m using 15.0(1)M1. A future release will prevent the
Gateway from attempting Cisco Fax Relay.<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>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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>Nick Matthews<br>
<b>Sent:</b> Friday, April 09, 2010 9:21 AM<br>
<b>To:</b> Lelio Fulgenzi<br>
<b>Cc:</b> cisco-voip voyp list<br>
<b>Subject:</b> Re: [cisco-voip] SG3 Faxing and IOS v15.1 (new thread)<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>The feature is a DSP-software
feature in 15.1(1)T. This means it should not be protocol
dependent. And though it is a DSP feature, it is still not hardware
dependent (per our last thread).<br>
<br>
To my recollection, you should be able to use fax-passthrough with G711 with
CUCM. I seem to remember doing this many times, but the only scenario I
can't remember if it works correctly is G729->G711 switchover with CUCM with
passthrough.<br>
<br>
The modem passthrough recommendation may be based in the pre-SG3 era, and not
be updated in the document. The <a href="http://cisco.com">cisco.com</a>
fax documents aren't particularly great sometimes. I will be interested
to see whether or not the SG3 makes T38 more stable. My thought it yes,
and I would personally start using T38 as my default rather than modem
passthrough with this new feature.<br>
<br>
Modem passthrough pseudo-supported SG3 before. Sometimes it would work,
sometimes not, because the DSPs were incapable of promising SG3 speeds.
That should also be changed now, as they support 56k speeds.<br>
<br>
-nick<br>
<br>
<br>
<o:p></o:p></p>
<div>
<p class=MsoNormal>On Fri, Apr 9, 2010 at 9:54 AM, Lelio Fulgenzi <<a
href="mailto:lelio@uoguelph.ca">lelio@uoguelph.ca</a>> wrote:<o:p></o:p></p>
<div>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'>I thought I'd start a new
thread to help with future searches.<br>
<br>
I took a closer look at that link I sent out earlier, the one that pointed me
to CUBE configuration, and it turns out there is a section in there that talks
about:<o:p></o:p></span></p>
<div style='margin-left:30.0pt'>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>SG3 Fax Support on Cisco TDM-IP Voice Gateways and Cisco UBE
Platforms </span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'><br>
<br>
<a
href="http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb-gw-config.html#wp1423706"
target="_blank">http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb-gw-config.html#wp1423706</a><o:p></o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'><o:p> </o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>While it goes in depth about relay, for fax pass-through, it
simply points to an old v12.4T document (<a
href="http://www.cisco.com/en/US/docs/ios/voice/fax/configuration/guide/vf_cfg_fx_passthr_ps6441_TSD_Products_Configuration_Guide_Chapter.html"
target="_blank">link</a>). The <a
href="http://www.cisco.com/en/US/docs/ios/voice/fax/configuration/guide/vf_cfg_fx_passthr_ps10592_TSD_Products_Configuration_Guide_Chapter.html"
target="_blank">new one</a> (for v15.1) doesn't seem to go into any specific
discussion about SG3 speeds, in fact, all it talks about is SG3 downgrading to
G3.<br>
<br>
In reading it more closely, it mentions only: MGCP, H323, and SIP. Is SCCP out?<br>
<br>
In reading it even more closely, it mentions that if you're using all Cisco
gateways, you should use modem passthrough.<o:p></o:p></span></p>
<div style='margin-left:30.0pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'><o:p> </o:p></span></p>
<p><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>Note </span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'><b>Error! Filename not specified.</b>Modem pass-through is
preferred if all of the involved gateways are Cisco IOS gateways.<o:p></o:p></span></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><br>
And even more reading says if you're using CCM, you MUST use modem passthrough.<o:p></o:p></span></p>
<div style='margin-left:30.0pt'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'>Note </span></b><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'><b>Error! Filename not specified.</b>If you need to configure fax
pass-through to work with Cisco CallManager (CCM), you must use the <b>modem
passthrough nse</b> command. The f<b>ax protocol pass-through </b>command does
not work with CCM, which relies on NSE information. <o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'><br>
So what's the deal? <o:p></o:p></span></p>
<ul type=disc>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l0 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Is SG3 supported on modem passthrough which I now
must use? <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l0 level1 lfo1'><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif"'>Does that mean I can stick with SCCP on my VG224,
since SCCP supports modem passthrough?<o:p></o:p></span></li>
</ul>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><br>
<br>
<br>
<br>
<br>
<br>
<o:p></o:p></span></p>
<div style='margin-left:30.0pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:black'><o:p> </o:p></span></p>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif";color:black'><br>
keywords: super G3 faxing fas passthrough fax pass-through confusing<br>
<br>
---<br>
</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#888888'>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)</span><span
style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p>
</div>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
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