<br><br><div class="gmail_quote">2012/10/4 Brett Lehrer <span dir="ltr"><<a href="mailto:Brett.Lehrer@solarismed.com" target="_blank">Brett.Lehrer@solarismed.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">>What is the setup you're talking about ?<br>
>Is it something like this ?<br>
>PSTN ---- nexVortex T.38 gateway ----- Internet ----- DSL modem ---<br>
>Asterisk ---- Fax machine<br>
</div>Olivier,<br>
<br>
Sorry, I did a poor job explaining that. That's basically correct, with the receiving end first and our originating end last in your diagram. For outgoing faxes only, this is the setup:<br>
<br>
Fax interface (LAN website, in short) -> Asterisk PBX -> DSL modem -> Internet -> nexVortex trunk -> [recipient]<br>
<br>
Incoming faxes are generally more reliable, but I still get small number of failures. I've mistakenly overestimated the incoming failure rate. Don't have clean statistics on that, though.<br></blockquote><div class="im">
<br>How many fax and voice calls (which codecs for tha latter ones ?) are on average using your DSL line ?<br><br>1. Previously, I experienced failures during the process of converting incoming PDF documents into ready-to-send fax image files while the reverse process (from a fax file into a PDF or whatever document) never failed.<br>
<br>I would be curious to check if a greater failure rate for outbound faxing (greater than inbound faxing failure rate) could simply comes from image processing, before any transmission.<br><br>2. Though your DSL line may have enough bandwidth from your location to its
DSLAM, chances are packets are dropped or delivered too late for T.38
faxing.<br>An interesting test would be to use an Asterisk PBX hosted somewhere at "close range" from netVortex fax gateways : that would remove most networking issues out of the equation.<br><br><br>
<br>
> Unexplainable FAX call failures (i.e. not wrong numbers of other<br>
>obviously wrong things) should be well below 1%. On a dedicated DSL<br>
>line, if everything is set up properly you should be getting that kind<br>
>of rate. This is especially true if you are using T.38 and the provider<br>
>at the far end uses a decent T.38 platform. Across the open internet<br>
>results are much more variable.<br>
<br>
>Depending what causes your 25% failures, you may get better results with<br>
>spandsp than with FFA.<br>
<br>
>Steve<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I see, thanks. All of these faxes are going out to unknown, external machines. I have no control over anything on their ends, and the hardware/connection is as variable as you could imagine. I'll definitely look into SpanDSP. FWIW, the dedicated DSL line is just a 6 Mbps up/768 Kbps down Internet connection that is solely used by our in-house PBX to connect to the trunk.<br>
<div class="im"><br>
<br>
>However I'd just suggest that you look at the business case for screwing around with fax at all.<br>
</div>Oh man, if only... I'd LOVE to just drop fax completely and use email instead.<br>
<span class="HOEnZb"><font color="#888888"><br>
Brett Lehrer<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
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