asterisk users - Nov 2004 - spandsp problem

From the * machine, I'm able to fax (txfax) just the first page of a 
multi-page document.  I've tried this on a Sharp UX-P200 as well as an 
HP 5510 machines with the same result.  The document was assembled using 
gs from a series of .ps documents.

The fax machines are connected to an Adtran 750 channel bank and then to 
the * machine with a T-1 crossover cable.  I can fax from one machine to 
the other in this configuration without problems.  zttool doesn't 
register any missed interrupts.

I'm using spandsp-0.0.1k  The span-0.0.2pre4 doesn't work for me.

The logs all have the following:

... (faxing first page)
 >>>MPS: 4f
HDLC underflow in state 13
Changed phase from 4 to 3
Slow carrier up/down/up/down, etc.
<<<XCN: fa
XCN with final frame tag
In state 13
Disconnecting
Changed phase from 3 to 7
Changed phase from 7 to 8
Hungup

While I was composing this email, I tried the fax again on the HP, and 
it worked.  That tells me that the problem is intermittent and that 
there's nothing wrong with the document.

Where should I be looking?  Should I put the fax machines on a TDM card 
to eliminate the T-1?  Should I be trying to get the spandsp-0.0.2 
version to work?

Thanks for your help.
Mike



-- 
Michael Welter
Introspect Telephony Corp.
Denver, Colorado US
+1.303.674.2575
mike@introspect.com
www.introspect.com

Hi Michael,

Michael Welter wrote:
> From the * machine, I'm able to fax (txfax) just the first page of a 
> multi-page document.  I've tried this on a Sharp UX-P200 as well as an 
> HP 5510 machines with the same result.  The document was assembled 
> using gs from a series of .ps documents.
>
> The fax machines are connected to an Adtran 750 channel bank and then 
> to the * machine with a T-1 crossover cable.  I can fax from one 
> machine to the other in this configuration without problems.  zttool 
> doesn't register any missed interrupts.
>
> I'm using spandsp-0.0.1k  The span-0.0.2pre4 doesn't work for me.
What happens with 0.0.2pre4? For most people that version gives better 
results than 0.0.1k. It seems to fix most of the quirks people have had.
>
> The logs all have the following:
>
> ... (faxing first page)
> >>>MPS: 4f
> HDLC underflow in state 13
> Changed phase from 4 to 3
> Slow carrier up/down/up/down, etc.
> <<<XCN: fa
> XCN with final frame tag
> In state 13
> Disconnecting
> Changed phase from 3 to 7
> Changed phase from 7 to 8
> Hungup
spandsp says we have more pages to send. The remote fax machine sends a 
disconnect message and hangs up. It sounds like the remote fax machine 
is at fault. Does it always fail with one machine, and succeed with 
another? Some machines can be set to receive a maximum of X pages. Could 
it be soemthing like that.
>
> While I was composing this email, I tried the fax again on the HP, and 
> it worked.  That tells me that the problem is intermittent and that 
> there's nothing wrong with the document.
>
> Where should I be looking?  Should I put the fax machines on a TDM 
> card to eliminate the T-1?  Should I be trying to get the 
> spandsp-0.0.2 version to work?
>
Try to get 0.0.2 working. It works well enough for other people than it 
is about to loose its "pre" status.

Steve