[asterisk-users] Problems receiving some faxes in T.38

[Santiago Gimeno]

Hi David,

>
> That's very similar to a setup I made. And I was troubleshooting
> similar problems. Let me ask you a question:
>
> Are you quite confident that the inbound faxes that fail are going to
> succeed on an ordinary fax machine?

At least I'm sure of a couple of calling numbers that I know are real
faxes that work.
There are others, I suspect, are not really "good" faxes.

>
> In my case I was able to crank through my logs, and trace that the
> failing calls were people who were calling a fax line by mistake, or
> wardialers, or clients with lousy fax configurations where those faxes
> also fail to our 'real' fax machines.
>
> When we stopped counting the 'never going to work anyway' faxes in our
> fax success calculations we had nearly perfect success rates.
>
> And here's my debugging tip. Pick a number that always fails, change
> the Cisco dialpeer to send those as ordinary audio fax passthrough, no
> t.38, use asterisk with monitor to record them, and watch whether they
> ever succeed. I'm willing to be my two cents that they don't.
>

Thanks for the tip, I'll try this in order to figure out which are
"real" and which are not.

Best regards,

Santiago Gimeno