yes as soon as the GW identifies the V.21 tones it knows that the call is a fax call and if the gateway is configured to do so, it may try to negotiate fax relay with the peer gateway. Until V.21 its all modem passthrough. <br>
<br><div class="gmail_quote">On 23 October 2012 16:41, Eric Pedersen <span dir="ltr"><<a href="mailto:PedersenE@bennettjones.com" target="_blank">PedersenE@bennettjones.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">If both gateways are MGCP it works great. Modem passthrough kicks in first and then switches over to T.38 when the GW detects the fax tones.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></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""> <a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a> [mailto:<a href="mailto:cisco-voip-bounces@puck.nether.net" target="_blank">cisco-voip-bounces@puck.nether.net</a>]
<b>On Behalf Of </b>Scott Voll<br>
<b>Sent:</b> 22 October 2012 2:53 PM<br>
<b>To:</b> <a href="mailto:cisco-voip@puck.nether.net" target="_blank">cisco-voip@puck.nether.net</a><br>
<b>Subject:</b> [cisco-voip] T.38 vs modem passthrough<u></u><u></u></span></p>
</div><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">if everything we have is setup to use t.38 and I need Modem passthrough also, Can they both run together?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">CM 7.1<u></u><u></u></p>
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<div>
<p class="MsoNormal">VG224<u></u><u></u></p>
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<p class="MsoNormal">MGCP VGW 15.1T code<u></u><u></u></p>
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<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">TIA<u></u><u></u></p>
</div>
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<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Scott<u></u><u></u></p>
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