[asterisk-users] res_fax

[Kevin P. Fleming]

On 01/26/2011 01:19 PM, Bryant Zimmerman wrote:
>
> ------------------------------------------------------------------------
> *From*: "Kevin P. Fleming" <kpfleming at digium.com>
> *Sent*: Wednesday, January 26, 2011 1:50 PM
> *To*: asterisk-users at lists.digium.com
> *Subject*: Re: [asterisk-users] res_fax
>
> On 01/26/2011 12:42 PM, Bryant Zimmerman wrote:
>>  Steve
>>
>>  Are there any undocumented options available with ReceiveFAX and the
>>  res_fax_spandsp module.
>>  I am having issues with getting t.38 to negotiate with Level 3 faxes but
>>  if I force t.30 the fax comes in. But the fax does not fall back t.30 if
>>  the t.38 fails
>
> You haven't posted any logs of the failing attempts, or packet captures
> of the SIP traffic, so it's pretty much impossible for anyone to help
> you debug this (anyone who tried would just be guessing).
>
> Steve did not write res_fax (which where SendFAX and ReceiveFAX come
> from), and there are no 'undocumented' options available for it, because
> it's open source and the source code shows all the options that are
> available.
>
> If you would like to try to figure out what is going on, start by
> posting a *complete* log file from Asterisk for a failed inbound FAX
> attempt, with 'core set debug 10' and 'core set verbose 10' and all
> logger levels (including 'fax') enabled.
>
> ----------------------------------------------
>
> Kevin
>
> These were attached to another post. Here are the links again
> Fax Debug.txt
> <http://webmail.zktech.com/public/downloadfile.aspx?f=KERoF6PWf6e2FK8S5zgEDs02rFGdd7zE0AIG7tjbCR9a06oFY1NwFap58zDWva3BcdOp%2b%2f%2fuBo8%3d>
> cap-t38.pcap
> <http://webmail.zktech.com/public/downloadfile.aspx?f=ulHIhepag5qoKm0cTUmljmT%2f7YCcOPvzlyZcnZg%2fG2B25W%2fsSr6Uwbu%2bET3kbKw84pTJjtuqrPQ%3d>

Unfortunately that log capture is incomplete; it doesn't include any of 
the messages that res_fax emits as it goes through T.38 negotiations. 
Please ensure that your 'console' channel in logger.conf has 
'debug,verbose,warning,notice,error,fax' enabled and that you have 'core 
set verbose 10' and 'core set debug 10' set before the call attempt 
begins (or at least before ReceiveFAX is executed). If the server is 
only processing this particular call, then 'sip set debug on' would also 
be helpful.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kfleming at digium.com
Check us out at www.digium.com & www.asterisk.org