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[asterisk-users] Receiving faxes with spandsp question

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idemkovitch at yahoo.com
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Posted: Thu Jun 25, 2015 12:01 am Post subject: [asterisk-users] Receiving faxes with spandsp question

Hello! I’m trying to add fax functionality to my asterisk installation. Right now I’m focusing on receiving faxes. This is not explained in a book, but I assume that I can use same context, add “fax” extension and if someone calls to send fax - it will autodetect. Right? Per book, I made following setup additions: 1. In sip.conf [general] I added: ;FAX stuff faxdetect=yes t38pt_udptl=yes 2. In extensions.conf I hade something like this: [from-callcentric] exten => s,1,Goto(automated_attendant,s,1) ; FAX handling stuff AS IN BOOK exten => fax,1,Verbose(3,Incoming Fax) same => n,Set(FAXDEST=/tmp) ; folder where faxes will be stored same => n,Set(tempfax=${STRFTIME(,,%C%y%m%d%H%M)}) same => n,ReceiveFax(${FAXDEST}/${tempfax}.tif) same => n,Verbose(3, - Fax receipt completed with status: ${FAXSTATUS}) Well, that didn’t work. Trying to send fax - it was going to my autoattendant and never triggered fax. So, I made a change like so: 3. Changed extensions.conf [from-callcentric] ; FAX handling stuff AS IN BOOK exten => s,1,Verbose(3,Incoming Fax) same => n,Set(FAXDEST=/tmp) ; folder where faxes will be stored same => n,Set(tempfax=${STRFTIME(,,%C%y%m%d%H%M)}) same => n,ReceiveFax(${FAXDEST}/${tempfax}.tif) same => n,Verbose(3, - Fax receipt completed with status: ${FAXSTATUS}) I just made it fax handling context, and I got FAX !!!! But, while fax was received I was getting following: [2015-06-24 23:40:28] WARNING[47369][C-00000005]: res_fax_spandsp.c:438 spandsp_log: WARNING T.30 ECM carrier not found QUESTIONS: 1. Should I do something about this warning? 2. How do I receive fax and have main entry to auto attendant in a same context? Can I have it on same puplic phone number? Thanks! Ivan -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users

ecc at cmu.edu
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Posted: Thu Jun 25, 2015 11:21 am Post subject: [asterisk-users] Receiving faxes with spandsp question

On Thu, Jun 25, 2015 at 12:00:52AM -0500, Ivan Demkovitch wrote:

Quote:

[...]
I just made it fax handling context, and I got FAX Smile

!!!! But,
while fax was received I was getting following:

[2015-06-24 23:40:28] WARNING[47369][C-00000005]: res_fax_spandsp.c:438 spandsp_log: WARNING T.30 ECM carrier not found

QUESTIONS:

1. Should I do something about this warning?
2. How do I receive fax and have main entry to auto attendant in a
same context? Can I have it on same puplic phone number?

1. I see the same warning messages and I ignore them.

2. I have "exten => fax,1,Goto(fax,s,1)" in both my [incoming] context
and in my [screen-callers] context (equivalent to your auto-attendant,
I guess). I think the time for fax detection can vary, so it might
occur in either context. Then I define all the actual fax handling in
the [fax] context.

--
Eric Cooper e c c @ c m u . e d u

--
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kevin.larsen at pionee...
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Posted: Thu Jun 25, 2015 11:51 am Post subject: [asterisk-users] Receiving faxes with spandsp question

Quote:

I’m trying to add fax functionality to my asterisk installation.
Right now I’m focusing on receiving faxes. This is not explained in
a book, but I assume that I can use same context, add “fax”
extension and if someone calls to send fax - it will autodetect. Right?

Per book, I made following setup additions:

1. In sip.conf [general] I added:

;FAX stuff
faxdetect=yes
t38pt_udptl=yes

2. In extensions.conf I hade something like this:

[from-callcentric]
exten => s,1,Goto(automated_attendant,s,1)

; FAX handling stuff AS IN BOOK
exten => fax,1,Verbose(3,Incoming Fax)
same => n,Set(FAXDEST=/tmp) ; folder where faxes will be stored
same => n,Set(tempfax=${STRFTIME(,,%C%y%m%d%H%M)})
same => n,ReceiveFax(${FAXDEST}/${tempfax}.tif)
same => n,Verbose(3, - Fax receipt completed with status: $
{FAXSTATUS})

Well, that didn’t work. Trying to send fax - it was going to my
autoattendant and never triggered fax. So, I made a change like so:

3. Changed extensions.conf

[from-callcentric]
; FAX handling stuff AS IN BOOK
exten => s,1,Verbose(3,Incoming Fax)
same => n,Set(FAXDEST=/tmp) ; folder where faxes will be stored
same => n,Set(tempfax=${STRFTIME(,,%C%y%m%d%H%M)})
same => n,ReceiveFax(${FAXDEST}/${tempfax}.tif)
same => n,Verbose(3, - Fax receipt completed with status: $
{FAXSTATUS})

I just made it fax handling context, and I got FAX Smile

!!!! But,
while fax was received I was getting following:

[2015-06-24 23:40:28] WARNING[47369][C-00000005]: res_fax_spandsp.c:
438 spandsp_log: WARNING T.30 ECM carrier not found

QUESTIONS:

1. Should I do something about this warning?
2. How do I receive fax and have main entry to auto attendant in a
same context? Can I have it on same puplic phone number?

I think your problem may be that even though you created the exten => fax line, it never has a chance to auto detect and go there as it has already left that context before it has detected the fax and then has no fax extension to redirect to. You could put your fax extension in the automated_attendant context and that should work. I recommend a slightly different way of handling faxes.

What I did was create an incoming fax context (fax_incoming). In your above example, that is where the fax extension would live. That way I can handle my reception of faxes in one spot and if I ever need to bug fix/change my dialplan, I only have to do it in one spot. Then anywhere that I want to autodetect faxes and move them to the fax context I put the following extension code:

exten => fax,1,Goto(fax_incoming,${dialednumber},1)

Of course, if you don't want the comment in there, that could be reduced to just one line. Also, ${dialednumber} is just a variable I use to hold the originally dialed number in case it has been altered as it goes through my dialplan so that I can have my CDR records show what was originally dialed in case I need to go back later. In your example, you would replace ${dialednumber} with whatever you need to work with your fax handler. I have multiple fax numbers, so I like to know which one was dialed to reach that spot. Makes bookkeeping easier.

I have this working on my sites that use an IVR and based on the timing, it gets a few seconds into playing the ivr message usually before it detects the fax and redirects it to the proper fax context. I have separate fax numbers, but this does catch those who don't pay attention and dial the main number instead of the fax number. I also use it on the direct dials to my phones. When I get a fax that way, my desk phone will get about one ring before the fax is detected and the call is moved away.

Faxing can be finicky to get working how you want it, but you can usually make it handle the faxes like you want.

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