10-31-2008 09:09 AM - edited 03-15-2019 02:17 PM
Hello,
we have a fax-machine connected directly to a bri port on a cisco3825 gw.
To the pstn we have a e1 pri.
pstn <--E1-- cisco3825 <--BRI-- FAX
Sometimes when we send a fax out to the pstn the receiver just gets a blank page but we see a sending successfull.
I tryed it with the fax on a bri-port with e seperate bri/analog TA and also on a fxs-port in the gw.
The fax call is pots to pots!
Does anyone know what is a possible reason for this behavior?
How can a fax send a blank page? I think the remote site must confirm the recieveing?
What is important to configure?
--> My networkclock settings are fine. No slips!
Regards
Sebastian
10-31-2008 12:37 PM
Hello Sebastian,
I have some experience of 'blank fax'.
(1)I guess there are a lot of errors between these two fax macines. I don't know where.
(2)I guess 'ECM' is disabled or isn't
supported on the recieving side fax macine.
If these two assumption is true, a fax can
send a blank page.
IMHO, the possibility reason is this pots to pots connection type. I guess the fax call doesn't use the DSP in the router. But I don't know the true reason...
Best Regards,
Yama
11-01-2008 12:54 PM
Hi Yama,
do you know (or everybody else) it is possible to send blank pages with "ECM" enable?
For us it is the worst case to get a "sending complete" and the other site gets a blank site because we ues faxes it for ordering.
Does someone have a pots to pots configuration for faxing and have no problems?
What settings on fax you use?
What setting avoid using DSP for faxing?
Every answer is welcome.
Regards,
Sebastan
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