Re: [hylafax-users] COMREC Errors with MultiTech MT1932ZDX Modems

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Brian S. Drexler wrote:

> Greetings to all. I’ve been having a problem with my HylaFAX solution 
> that is growing more and more irritating. I have been getting COMREC 
> errors on more and more incoming faxes. I will receive two out of 
> three pages and then it seems to die. I can’t figure out what’s going 
> on. After searching the internet for the last two days, the best thing 
> that I have come up with to try is upgrading the firmware of my modems 
> (which I can’t seem to find a firmware update because they are so 
> old). I contacted Multi-tech out of desperation but I doubt I will get 
> a whole lot of help from them. Does anyone have any idea what I could 
> do to help this problem? I have no problem with buying new modems, but 
> that can get a bit pricey (especially since I’m using nine of these). 
> But I won’t rule that out as an option. Any help or suggestions 
> (including modem models I could use as a replacement) would be greatly 
> appreciated.
>
> I’m running RedHat 6.2, with HylaFAX 4.2.1 (upgraded a couple days ago).


> Apr 12 08:29:24.19: [26109]: --> [20:+FPTS:2,1062,158,6,0]
>
>
> Apr 12 08:30:01.89: [26109]: --> [19:+FPTS:1,1057,50,4,0]
>
>
> Apr 12 08:30:25.61: [26109]: --> [21:+FPTS:2,1081,337,15,0]

The bad line counts (158, 50, 337) indicate a fair amount of 
communication interference occuring between the modem and the sender. As 
this kind of interference increases the number of problems you'll see 
will also increase. Many senders will "ignore" the meaning of an RTN 
signal, and although it will retrain afterwards it will not resend the 
page. Thus, you're only going to see one page here (the 2nd page) which 
was not "dirty" enough to trigger RTN.

So the best thing that you could do for yourself is to figure out what 
is causing the interference and fix that. However, in the short long 
run, as people and businesses start migrating their PBXes and phone 
infrastructure to VoIP, many senders will be trying to use it as a fax 
medium, and so we're going to have to come to expect a fair amount of 
interference as "normal" for uncontrolled environments.

So the next thing you should look at is getting into using ECM. If your 
modem supports Class 1 then switch to it. If it doesn't then get a modem 
that does.

The last thing... is that HylaFAX probably should, as part of the 
"SaveUnconfirmedPages" feature, save pages that were rejected with RTN 
because "most" of the time the sender will not retransmit them. So 
despite the fact that the page is dirty, we'll need to keep it, because 
it's all that we've got. HylaFAX doesn't do this yet.

Lee.


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