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Connect the FAX to an analog port on the TA900. Disable echo
cancellation, alc, plc, nls, and lower tx/rx gain as far as it will
go. You shouldn't need T.38 on a T1 with QoS enabled and no public
Internet. Disable any (super)G3 capabilities in the fax machine.<br>
<br>
On 12/15/2010 4:53 PM, Jeff Anderson wrote:
<blockquote
cite="mid:AANLkTi=e44EFEZ6=12jKSO_K8FZKeCVgHydNQb1zo1v0@mail.gmail.com"
type="cite">We are experiencing a fair amount of heart burn
attempting to support faxing over our Dynamic T1 product. Some
customers it works great and others have frequent problems.<br>
<br>
We currently support dynamic T1's using both Adtran TA900 series
and Cisco IAD2400 services routers. The customers fax machines
will connect to their PBX that has a PRI to an IAD/TA. We have the
IAD/TA configured for SIP signaling to an Acme SBC selecting T.38
as the preferred codec with fallback to g.711 pass-through. We can
force a slower speed, disable error correction, disabled VAD but
in the end still have very inconsistent results. From a network
perspective the QoS is matching and queuing correctly, the
circuits are clean and the IP SLA gives us no reason to believe
they are having any network drops or jitter.<br>
<br>
I was wondering if others who have experience with faxing over IP
could share what they have learned works best or anything else
that may be helpful.<br>
<br>
Any help is greatly appreciated.<br>
<br>
Thanks,<br>
<br>
Jeff<br>
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<br>
<pre class="moz-signature" cols="72">--
Lee Riemer
Director of Technical Operations
Bestline Communications, L.P.
Voice: 1+512.328.9095
Fax: 1+512.328.0038</pre>
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