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<div class="moz-cite-prefix">On 09/25/2012 10:29 AM, Bryant
Zimmerman wrote:<br>
</div>
<blockquote cite="mid:28500713$b75da0d$17d8e3ae$@zktech.com"
type="cite"><span style="font-family: Arial, Helvetica,
sans-serif; font-size: 10pt"><span style="font-family:
tahoma,arial,sans-serif; font-size: 10pt;">
<hr align="center" size="2" width="100%">
<b>From</b>: "Jeff LaCoursiere" <a class="moz-txt-link-rfc2396E" href="mailto:jeff@sunfone.com"><jeff@sunfone.com></a><br>
<b>Sent</b>: Tuesday, September 25, 2012 11:05 AM<br>
<b>To</b>: <a class="moz-txt-link-abbreviated" href="mailto:asterisk-users@lists.digium.com">asterisk-users@lists.digium.com</a><br>
<b>Subject</b>: Re: [asterisk-users] T.38 gateway ATA</span><br>
<br>
<div class="moz-cite-prefix">On 09/25/2012 09:26 AM, Bryant
Zimmerman wrote:<br>
</div>
<blockquote cite="mid:4253f1b8$74548bd$1735d5aa$@zktech.com"
type="cite"><span style="font-family: arial, helvetica,
sans-serif; font-size: 10pt;">Jeff<br>
<br>
Can you please clarify your layout? If you have an asterisk
1.8 (I would use 10 for this if possible) server why can't
you just take the gateway call on that via a sip trunk. If
you are coming in from and land line and want to do t.38 to
the asterisk 1.8 server you would need a FXO t.38 gateway.
Based on your description I am not sure what your sources
are and what your final desired destination is. Please be
specific with your response. We do t.38 all the time and
have great success with it but the success is in the setup
and control of the endpoints (gateways and ATAs)<br>
<br>
<div>Thanks<br>
<br>
Bryant Zimmerman (ZK Tech Inc.)<br>
616-855-1030 Ext. 2003</div>
<br>
<br>
<span style="font-family: tahoma,arial,sans-serif;
font-size: 10pt;">
<hr align="center" size="2" width="100%">
<b>From</b>: "Jeff LaCoursiere" <a moz-do-not-send="true"
href="mailto:jeff@sunfone.com"
class="moz-txt-link-rfc2396E"><jeff@sunfone.com></a><br>
<b>Sent</b>: Monday, September 24, 2012 9:20 PM<br>
<b>To</b>: "Asterisk Users Mailing List - Non-Commercial
Discussion" <a moz-do-not-send="true"
href="mailto:asterisk-users@lists.digium.com"
class="moz-txt-link-rfc2396E"><asterisk-users@lists.digium.com></a><br>
<b>Subject</b>: [asterisk-users] T.38 gateway ATA</span><br>
<br>
<br>
Hoping for some clarification. I would like to setup a
NORMAL (not <br>
T.38) fax machine on an ATA, and have the ATA be a T.38
gateway to a <br>
remote asterisk (1.8) server, which is doing T.38 relay
(passthru) to a <br>
provider.<br>
<br>
Some amount of googling today seems to imply that most ATAs
are just <br>
T.38 passthru devices, and expect a T.38 capable fax
machine, otherwise <br>
just fallback to ulaw (and mostly fail, in my experience so
far).<br>
<br>
So does anyone use an ATA that actually does the gateway
transcoding to <br>
a normal fax machine? Or am I barking up the wrong tree?<br>
<br>
Thanks!<br>
<br>
j<br>
<br>
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</blockquote>
<br>
Hi Bryan,<br>
<br>
To follow an inbound fax call, our intended setup would be:<br>
<br>
Our upstream sends a T.38 call to our border asterisk (1.8)
server, which creates another T.38 call to the customer's hosted
asterisk (1.8) instance, which creates another T.38 call to the
ATA, which is over the Internet to their location. The ATA
would do the transcoding (is that even the appropriate term in
this case?) to T.30, to the FXS connected normal fax machine.<br>
<br>
Its that last bit that I am having trouble confirming is a
feature of any mainstream ATA. When I dug into it yesterday it
seems that the mainstream ATAs will passthru T.38, expecting the
connected fax machine to work with T.38 natively. I can't
depend on that. The asterisk servers are all remote, and though
I could presumably do the gateway on the asterisk server I would
then have a ulaw fax call over the internet to the ATA, which in
my experience has not been very reliable.<br>
<br>
Of course I will need outbound faxing to follow the reverse
path, letting the ATA turn the T.30 outbound fax call into T.38,
which travels through our various asterisk servers to the
upstream provider...<br>
<br>
So in a nutshell, is there anyone using an ATA as the *gateway*
rather than passthru? I feel I am still not being clear... does
that help?<br>
<br>
Thanks,<br>
<br>
j<br>
<br>
Jeff<br>
<br>
In your call stream you must make sure that all asterisk systems
have the proper configurations for T.38 and that spandsp is
loaded on the systems. Each peer entry must have the correct
setup and the correct rtp port ranges must be set on all
asterisk servers. Each server must have the correct
configurations for their firewalls as well. I would flatten this
to start. If possible connect the ATA's directly as a
registration to your proxy. You will likely have better
results. We have had the best luck with ATA's from audio codes
and grandstream currently the HT-701, 702 have been working
well. You must get the mix right and them keep it flat. Every
time you allow user to drop an asterisk box between you and the
ata you will give yourself a greater issues as they must become
an asterisk t.38 expert to get the deployment to work or you
must take it on. Hope this helps. T.38 works well when you get
the right mix and control it. <br>
<br>
Bryant</span>
<br>
</blockquote>
<br>
Hmm, I would think I would need spandsp only if the asterisk
server(s) would be gateways... is that not the case? If all I want
the asterisk servers to do is passthru T.38, I assumed nothing was
needed other than asterisk. Our asterisk servers are all SIP - we
have no TDM connectivity.<br>
<br>
Still interested to know if your ATAs are being used as T.38
gateways? It sounds to me like you are just using ulaw calls to
your ATAs. True?<br>
<br>
Thanks,<br>
<br>
j<br>
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