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Brian,<br>
<br>
I am *not* going out to/in from the world at large from/to the FS
box via T38. I don't have a T38 capable gateway at the moment, and
this is for an emergency box to replace a machine with several
analog modems attached to the Mitel PBX.<br>
<br>
Therefore I have to translate t38modem's T38 I/O into audio over SIP
to send to/rcv from our (non-T38-understanding) Mitel PBX which
connects via E1 trunks to the PSTN.<br>
<br>
I know it's not ideal but it does seem to work OK so far.<br>
<br>
We have an older fax server (analog lines) where the modem does not
support ECM. We virtually never have any problems sending or
receiving faxes from this machine. However if you or anyone else can
help get ECM working in this setup I'd be happy, but I have my
doubts due to the G.711 step between the FS machine and the Mitel,
probably causing jitter.<br>
<br>
<br>
To clarify, here is the topology:<br>
<br>
Hylafax<---Audio---->t38modem<---T38--->Freeswitch/t38gateway<----G.711/SIP--->Mitel
3300(T38 unsupported, grr)<---ISDN30---->PSTN<br>
<br>
I have to do the transcode as the Mitel is the weak link.<br>
<br>
If I could pop an E1 card in the FS box I'm sure things would work a
lot better, but we don't have a spare card or indeed a spare circuit
right now!<br>
<br>
Hope this make sense....<br>
<br>
Alex<br>
<br>
<br>
<br>
On 11/11/11 16:18, Brian West wrote:
<blockquote
cite="mid:82A6EE94-026E-44FD-9D33-586FB7077FC3@freeswitch.org"
type="cite">Disabling ECM by FAR the WRONG thing to do and you
have this mindset that is required its only required when you were
hanging on by a thread doing G.711 Faxing over the public internet
and you didn't want one tiny blip to screw the fax over. I still
don't understand why Alex is doing t.38 gateway from audio to
t.38? Either way ECM works fine never had any issues with it.
<div><br>
</div>
<div>/b</div>
<div><br>
<div>
<div>On Nov 11, 2011, at 9:32 AM, Steve Underwood wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite"><span class="Apple-style-span"
style="border-collapse: separate; font-family: Helvetica;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
font-size: medium;">Turning off ECM is equivalent to
saying "I use FAX, but I couldn't give<span
class="Apple-converted-space"> </span><br>
a damn if they are received".<br>
<br>
Steve<br>
<br>
<br>
On 11/11/2011 09:51 PM, Tihomir Culjaga wrote:<br>
<blockquote type="cite">always disable ECM for fax calls
over IP... its the 1st rule of thumb<span
class="Apple-converted-space"> </span><br>
</blockquote>
<blockquote type="cite">for VoIP faxing :=)</blockquote>
</span></blockquote>
</div>
<br>
</div>
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