[asterisk-users] fax over ip

[Christopher Corn]

I have an trixbox system setup, and all my phones are IP based, different Grandstream phones to be exact. I have some fax machines that are still around, using analog lines of course.      I've read a little into FOIP and the changing of the signals form t30(traditional fax machines) to t.38 ( ip faxmachines).      From what I understand, it's alot like voip, with origination and temrination. Can someone recommende, i guess, a FOIP provider? someone that can provider the gateway services?     Also, how am i supposed to get my fax machine onto my ethernet network? i assume it needs some kind of Aanalog Telephone Adapter, just like with VOIP.      Any info is appreciated , this is still clewgy to me.___
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[asterisk-users] Fax over IP ?

[Ahmed Munir]

Hi all,

Couple of things I would like ask, does Asterisk provides free license for
FoIP (for 1 channel) or need to purchase it? Couple of years back, I was
able to send and receive the fax using Digium T1 card, in term of FoIP how
can I able to receive fax from traditional telephone lines / T1 lines? As
far my understanding, the functionality for FoIP is to send fax to email or
receive fax from email i.e. using T.38 protocol.

The thing I would like to know how I can implement this solution i.e.
receiving fax via IP? Correct me if I'm wrong, while receiving fax from
traditional telephone lines will the topology looks like as listed below;

PSTN Lines --> Asterisk (mounted a T1/ analog card) --> IP --> Asterisk
(receive Fax over IP)

or else?

Please advice.


-- 
Regards,

Ahmed Munir Chohan
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Re: [asterisk-users] fax over ip

[Luki]

Christopher,


Also, how am i supposed to get my fax machine onto my ethernet network? i
assume it needs some kind of Aanalog Telephone Adapter, just like with VOIP.


You need a T.38 capable ATA. There are a few but not too many. I
believe the Grandstream ATAs have T.38 support or will have it
("Support transparent Fax pass-through and in the future T.38
(pending)"). The Linksys/Sipura 2100 can definitely do it -- it works
well for me :).

Then you need a T.38 capable ITSP. Some are listed on
http://www.voip-info.org/wiki/view/VOIP+Service+Providers+T.38 but I
don't have experience with any other them.

T.38 pass-through support in Asterisk is available as a patch on the
bug tracker for 1.2. Not sure if it made it into the 1.4 beta version
or not, but on 1.2 it works OK for me.

--Luki
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Re: [asterisk-users] Fax over IP ?

[Tim Nelson]

- Original Message - 
> Hi all,
> Couple of things I would like ask, does Asterisk provides free
> license for FoIP (for 1 channel) or need to purchase it? Couple of
> years back, I was able to send and receive the fax using Digium T1
> card, in term of FoIP how can I able to receive fax from traditional
> telephone lines / T1 lines? As far my understanding, the
> functionality for FoIP is to send fax to email or receive fax from
> email i.e. using T.38 protocol.
> The thing I would like to know how I can implement this solution i.e.
> receiving fax via IP? Correct me if I'm wrong, while receiving fax
> from traditional telephone lines will the topology looks like as
> listed below;
> PSTN Lines --> Asterisk (mounted a T1/ analog card) --> IP -->
> Asterisk (receive Fax over IP)
> or else?

FoIP typically means the fax session traverses an IP link at some point, most 
commonly at the 'last mile'. What happens to the fax after that is up to your 
requirements. The faxes can be emailed out, stored in a web application, 
printed to a printer, etc. The possibilities are endless.

Asterisk does have a few options for faxing. Those are most notably:

1. Fax for Asterisk - Free license available for 1 channel, or paid licenses 
for 2+ channels
2. app_fax (I think this is the current module name) - Free fax module for 
Asterisk, no channel limit, based on SpanDSP
3. Hylafax+ and IAXmodem - Most complicated method of fax setup, but most 
robust and reliable (in my testing). Would require use of Asterisk 10 with T.38 
gateway functionality for proper fax reception.

Just keep in mind raw fax audio over VoIP is a bad idea, see here: 
http://www.soft-switch.org/foip.html

If you can provide some additional details on what you're planning to do, we 
can give more info.

--Tim

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Re: [asterisk-users] Fax over IP?

[Ahmed Munir]

Hi Tim,

Thanks for your response. Here is my topology as listing down below;

PSTN Line --> Cisco Voice GW --> IP Cloud --> Asterisk

Will Asterisk able to receive the fax (as in topology above) using its' fax
module? In sip.conf  I enabled fax detection and T.38. Actually I don't
want
to use Hylafax + iaxmodem as per requirement.

Please advice.



> Date: Fri, 1 Jun 2012 10:19:12 -0400
> From: Ahmed Munir 
> Subject: [asterisk-users] Fax over IP ?
> To: asterisk-users@lists.digium.com
> Message-ID:
> >
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi all,
>
> Couple of things I would like ask, does Asterisk provides free license for
> FoIP (for 1 channel) or need to purchase it? Couple of years back, I was
> able to send and receive the fax using Digium T1 card, in term of FoIP how
> can I able to receive fax from traditional telephone lines / T1 lines? As
> far my understanding, the functionality for FoIP is to send fax to email or
> receive fax from email i.e. using T.38 protocol.
>
> The thing I would like to know how I can implement this solution i.e.
> receiving fax via IP? Correct me if I'm wrong, while receiving fax from
> traditional telephone lines will the topology looks like as listed below;
>
> PSTN Lines --> Asterisk (mounted a T1/ analog card) --> IP --> Asterisk
> (receive Fax over IP)
>
> or else?
>
> Please advice.
>
>
> --
> Regards,
>
> Ahmed Munir Chohan
> -- next part --
> An HTML attachment was scrubbed...
> URL: <
> http://lists.digium.com/pipermail/asterisk-users/attachments/20120601/3c861c56/attachment-0001.htm
> >
>
> --
>
> Message: 15
> Date: Fri, 1 Jun 2012 09:29:19 -0500 (CDT)
> From: Tim Nelson 
> Subject: Re: [asterisk-users] Fax over IP ?
> To: Asterisk Users Mailing List - Non-Commercial Discussion
>
> Message-ID: <2939915.57880.1338560959074.javamail.r...@rockbochs.com>
> Content-Type: text/plain; charset=utf-8
>
> - Original Message -
> > Hi all,
> > Couple of things I would like ask, does Asterisk provides free
> > license for FoIP (for 1 channel) or need to purchase it? Couple of
> > years back, I was able to send and receive the fax using Digium T1
> > card, in term of FoIP how can I able to receive fax from traditional
> > telephone lines / T1 lines? As far my understanding, the
> > functionality for FoIP is to send fax to email or receive fax from
> > email i.e. using T.38 protocol.
> > The thing I would like to know how I can implement this solution i.e.
> > receiving fax via IP? Correct me if I'm wrong, while receiving fax
> > from traditional telephone lines will the topology looks like as
> > listed below;
> > PSTN Lines --> Asterisk (mounted a T1/ analog card) --> IP -->
> > Asterisk (receive Fax over IP)
> > or else?
>
> FoIP typically means the fax session traverses an IP link at some point,
> most commonly at the 'last mile'. What happens to the fax after that is up
> to your requirements. The faxes can be emailed out, stored in a web
> application, printed to a printer, etc. The possibilities are endless.
>
> Asterisk does have a few options for faxing. Those are most notably:
>
> 1. Fax for Asterisk - Free license available for 1 channel, or paid
> licenses for 2+ channels
> 2. app_fax (I think this is the current module name) - Free fax module for
> Asterisk, no channel limit, based on SpanDSP
> 3. Hylafax+ and IAXmodem - Most complicated method of fax setup, but most
> robust and reliable (in my testing). Would require use of Asterisk 10 with
> T.38 gateway functionality for proper fax reception.
>
> Just keep in mind raw fax audio over VoIP is a bad idea, see here:
> http://www.soft-switch.org/foip.html
>
> If you can provide some additional details on what you're planning to do,
> we can give more info.
>
> --Tim
>
>
>
> --
>
> Message: 16
> Date: Fri, 1 Jun 2012 09:36:50 -0500 (CDT)
> From: Tim Nelson 
> Subject: Re: [asterisk-users] Fax Server for Asterisk
> To: Asterisk Users Mailing List - Non-Commercial Discussion
>
> Message-ID: <13867195.58161.1338561410617.javamail.r...@rockbochs.com>
> Content-Type: text/plain; charset=utf-8
>
> - Original Message -
> > Hi Tim,
> > Unfortunately i can't reproduce the scenario because it was a long
> > time ago. But it would be nice to hear from you, what things can be
> > verified within fax and Asterisk? Any TIP on wireshark monitoring?
>
>

Re: [asterisk-users] Fax over IP?

[Tim Nelson]

- Original Message - 
> Hi Tim,

> Thanks for your response. Here is my topology as listing down below;

> PSTN Line --> Cisco Voice GW --> IP Cloud --> Asterisk

> Will Asterisk able to receive the fax (as in topology above) using
> its' fax module? In sip.conf I enabled fax detection and T.38.
> Actually I don't want
> to use Hylafax + iaxmodem as per requirement.

If your Cisco voice gateway can deliver the calls using T.38, that should give 
you decent reliability. You'll want to us Asterisk 10 which has the best T.38 
support at this point (compared to older releases). The receiving side of the 
equation then becomes whether to use Fax for Asterisk (commercial, 1 free 
channel, 2+ paid), or the included SpanDSP based fax module.

--Tim

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Re: [asterisk-users] Fax over IP?

[Ahmed Munir]

Hi Tim,

I'm using Asterisk 10 and on Cisco GW the protocol is set for FAX is T.38
and when I try to send the fax from a fax machine i.e. HP 3180, I'm getting
some warnings as listed below;

-- Executing [4112345678@default:1] Goto("SIP/192.168.1.69-0005",
"fax-detect,fax,1") in new stack
-- Goto (fax-detect,fax,1)
-- Executing [fax@fax-detect:1] NoOp("SIP/192.168.1.69-0005", "
FAX DETECTED ") in new stack
-- Executing [fax@fax-detect:2] Goto("SIP/192.168.1.69-0005",
"fax-receive,receive,1") in new stack
-- Goto (fax-receive,receive,1)
-- Executing [receive@fax-receive:1] NoOp("SIP/192.168.1.69-0005",
" FAX RECEIVE ") in new stack
-- Executing [receive@fax-receive:2] Set("SIP/192.168.1.69-0005",
"GLOBAL(FAXCOUNT)=5") in new stack
  == Setting global variable 'FAXCOUNT' to '5'
-- Executing [receive@fax-receive:3] Set("SIP/192.168.1.69-0005",
"FAXCOUNT=5") in new stack
-- Executing [receive@fax-receive:4] Set("SIP/192.168.1.69-0005",
"FAXFILE=fax-5-rx.tif") in new stack
-- Executing [receive@fax-receive:5] Set("SIP/192.168.1.69-0005",
"GLOBAL(LASTFAXCALLERNUM)=6461234567") in new stack
  == Setting global variable 'LASTFAXCALLERNUM' to '6461234567'
-- Executing [receive@fax-receive:6] Set("SIP/192.168.1.69-0005",
"GLOBAL(LASTFAXCALLERNAME)=") in new stack
  == Setting global variable 'LASTFAXCALLERNAME' to ''
-- Executing [receive@fax-receive:7] NoOp("SIP/192.168.1.69-0005",
" SETTING FAXOPT ") in new stack
-- Executing [receive@fax-receive:8] Set("SIP/192.168.1.69-0005",
"FAXOPT(ecm)=yes") in new stack
-- Executing [receive@fax-receive:9] Set("SIP/192.168.1.69-0005",
"FAXOPT(headerinfo)=MY FAXBACK RX") in new stack
-- Executing [receive@fax-receive:10] Set("SIP/192.168.1.69-0005",
"FAXOPT(localstationid)=1234567890") in new stack
-- Executing [receive@fax-receive:11] Set("SIP/192.168.1.69-0005",
"FAXOPT(maxrate)=14400") in new stack
-- Executing [receive@fax-receive:12] Set("SIP/192.168.1.69-0005",
"FAXOPT(minrate)=2400") in new stack
-- Executing [receive@fax-receive:13] NoOp("SIP/192.168.1.69-0005",
"FAXOPT(ecm) : yes") in new stack
-- Executing [receive@fax-receive:14] NoOp("SIP/192.168.1.69-0005",
"FAXOPT(headerinfo) : MY FAXBACK RX") in new stack
-- Executing [receive@fax-receive:15] NoOp("SIP/192.168.1.69-0005",
"FAXOPT(localstationid) : 1234567890") in new stack
-- Executing [receive@fax-receive:16] NoOp("SIP/192.168.1.69-0005",
"FAXOPT(maxrate) : 14400") in new stack
-- Executing [receive@fax-receive:17] NoOp("SIP/192.168.1.69-0005",
"FAXOPT(minrate) : 2400") in new stack
-- Executing [receive@fax-receive:18] NoOp("SIP/192.168.1.69-0005",
" RECEIVING FAX : fax-5-rx.tif ") in new stack
-- Executing [receive@fax-receive:19]
ReceiveFAX("SIP/192.168.1.69-0005",
"/var/spool/asterisk/fax/fax-5-rx.tif") in new stack
-- Channel 'SIP/192.168.1.69-0005' receiving FAX
'/var/spool/asterisk/fax/fax-5-rx.tif'
  == Using UDPTL CoS mark 5
[Jun  4 12:35:02] NOTICE[10371]: chan_sip.c:7577 sip_read: FAX CNG detected
but no fax extension
[Jun  4 12:35:02] WARNING[10072]: res_fax.c:1666 receivefax_t38_init:
channel 'SIP/192.168.1.69-0005' refused to negotiate T.38
[Jun  4 12:35:02] WARNING[10072]: res_fax.c:1687 receivefax_t38_init: Audio
FAX not allowed on channel 'SIP/192.168.1.69-0005' and T.38 negotiation
failed; aborting.
[Jun  4 12:35:02] ERROR[10072]: res_fax.c:1891 receivefax_exec: error
initializing channel 'SIP/192.168.1.69-0005' in T.38 mode
  == Spawn extension (fax-receive, receive, 19) exited non-zero on
'SIP/192.168.1.69-0005'

In my sip.conf global configuration I enabled 'fax detect' and
't38pt_udptl' and added Cisco VGW peer;

[CiscoVGW-10.70.X.X]
host=10.70.X.X
type=friend
disallow=all
allow=ulaw
allow=alaw
nat=yes
insecure=port,invite
context=fax-call
canreinvite=no
qualify=yes
dtmfmode=inband


While the fax machine starts to send the fax after a while it gives the
message, 'Fax failed' with error code: '388'. Is it the end point fax
machine issue or else? Please assist me out to resolve this issue at
earliest.


>
>
> > Thanks for your response. Here is my topology as listing down below;
>
> > PSTN Line --> Cisco Voice GW --> IP Cloud --> Asterisk
>
> > Will Asterisk able to receive the fax (as in topology above) using
> > its' fax module? In sip.conf I enabled fax detection and T.38.
> > Actually I don't want
> > to use Hylafax + iaxmodem as per requirement.
>
> If your Cisco voice gateway can deliver the calls using T.38, that should
> give you decent reliability. You'll want to us Asterisk 10 which has the
> best T.38 support at this point (compared to older releases). The receiving
> side of the equation then becomes whether to use Fax for Asterisk
> (commercial, 1 free channel, 2+ paid), or the included SpanDSP based fax
> module.
>
> --Tim
>
>
-- 
Regards,

Re: [asterisk-users] Fax over IP?

[Tim Nelson]

- Original Message - 

> Hi Tim,

> I'm using Asterisk 10 and on Cisco GW the protocol is set for FAX is
> T.38 and when I try to send the fax from a fax machine i.e. HP 3180,
> I'm getting some warnings as listed below;

> -- Executing [4112345678@default:1] Goto("SIP/192.168.1.69-0005",
> "fax-detect,fax,1") in new stack
> -- Goto (fax-detect,fax,1)
> -- Executing [fax@fax-detect:1] NoOp("SIP/192.168.1.69-0005",
> " FAX DETECTED ") in new stack
> -- Executing [fax@fax-detect:2] Goto("SIP/192.168.1.69-0005",
> "fax-receive,receive,1") in new stack
> -- Goto (fax-receive,receive,1)
> -- Executing [receive@fax-receive:1]
> NoOp("SIP/192.168.1.69-0005", " FAX RECEIVE ") in new
> stack
> -- Executing [receive@fax-receive:2] Set("SIP/192.168.1.69-0005",
> "GLOBAL(FAXCOUNT)=5") in new stack
> == Setting global variable 'FAXCOUNT' to '5'
> -- Executing [receive@fax-receive:3] Set("SIP/192.168.1.69-0005",
> "FAXCOUNT=5") in new stack
> -- Executing [receive@fax-receive:4] Set("SIP/192.168.1.69-0005",
> "FAXFILE=fax-5-rx.tif") in new stack
> -- Executing [receive@fax-receive:5] Set("SIP/192.168.1.69-0005",
> "GLOBAL(LASTFAXCALLERNUM)=6461234567") in new stack
> == Setting global variable 'LASTFAXCALLERNUM' to '6461234567'
> -- Executing [receive@fax-receive:6] Set("SIP/192.168.1.69-0005",
> "GLOBAL(LASTFAXCALLERNAME)=") in new stack
> == Setting global variable 'LASTFAXCALLERNAME' to ''
> -- Executing [receive@fax-receive:7]
> NoOp("SIP/192.168.1.69-0005", " SETTING FAXOPT ") in new
> stack
> -- Executing [receive@fax-receive:8] Set("SIP/192.168.1.69-0005",
> "FAXOPT(ecm)=yes") in new stack
> -- Executing [receive@fax-receive:9] Set("SIP/192.168.1.69-0005",
> "FAXOPT(headerinfo)=MY FAXBACK RX") in new stack
> -- Executing [receive@fax-receive:10]
> Set("SIP/192.168.1.69-0005",
> "FAXOPT(localstationid)=1234567890") in new stack
> -- Executing [receive@fax-receive:11]
> Set("SIP/192.168.1.69-0005", "FAXOPT(maxrate)=14400") in new
> stack
> -- Executing [receive@fax-receive:12]
> Set("SIP/192.168.1.69-0005", "FAXOPT(minrate)=2400") in new
> stack
> -- Executing [receive@fax-receive:13]
> NoOp("SIP/192.168.1.69-0005", "FAXOPT(ecm) : yes") in new stack
> -- Executing [receive@fax-receive:14]
> NoOp("SIP/192.168.1.69-0005", "FAXOPT(headerinfo) : MY FAXBACK
> RX") in new stack
> -- Executing [receive@fax-receive:15]
> NoOp("SIP/192.168.1.69-0005", "FAXOPT(localstationid) :
> 1234567890") in new stack
> -- Executing [receive@fax-receive:16]
> NoOp("SIP/192.168.1.69-0005", "FAXOPT(maxrate) : 14400") in new
> stack
> -- Executing [receive@fax-receive:17]
> NoOp("SIP/192.168.1.69-0005", "FAXOPT(minrate) : 2400") in new
> stack
> -- Executing [receive@fax-receive:18]
> NoOp("SIP/192.168.1.69-0005", " RECEIVING FAX : fax-5-rx.tif
> ") in new stack
> -- Executing [receive@fax-receive:19]
> ReceiveFAX("SIP/192.168.1.69-0005",
> "/var/spool/asterisk/fax/fax-5-rx.tif") in new stack
> -- Channel 'SIP/192.168.1.69-0005' receiving FAX
> '/var/spool/asterisk/fax/fax-5-rx.tif'
> == Using UDPTL CoS mark 5
> [Jun 4 12:35:02] NOTICE[10371]: chan_sip.c:7577 sip_read: FAX CNG
> detected but no fax extension
> [Jun 4 12:35:02] WARNING[10072]: res_fax.c:1666 receivefax_t38_init:
> channel 'SIP/192.168.1.69-0005' refused to negotiate T.38
> [Jun 4 12:35:02] WARNING[10072]: res_fax.c:1687 receivefax_t38_init:
> Audio FAX not allowed on channel 'SIP/192.168.1.69-0005' and
> T.38 negotiation failed; aborting.
> [Jun 4 12:35:02] ERROR[10072]: res_fax.c:1891 receivefax_exec: error
> initializing channel 'SIP/192.168.1.69-0005' in T.38 mode
> == Spawn extension (fax-receive, receive, 19) exited non-zero on
> 'SIP/192.168.1.69-0005'

> In my sip.conf global configuration I enabled 'fax detect' and
> 't38pt_udptl' and added Cisco VGW peer;

> [CiscoVGW-10.70.X.X]
> host=10.70.X.X
> type=friend
> disallow=all
> allow=ulaw
> allow=alaw
> nat=yes
> insecure=port,invite
> context=fax-call
> canreinvite=no
> qualify=yes
> dtmfmode=inband


T.38 failed to negotiate. That means either your Asterisk side, or your Cisco 
side are not playing nicely together. A packet capture of the call setup would 
be helpful to determine which side is having the issues.

--Tim

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Re: [asterisk-users] Fax over IP?

[Tim Nelson]

- Original Message - 

> Hi Tim,

> ...

> While the fax machine starts to send the fax after a while it gives
> the message, 'Fax failed' with error code: '388'. Is it the end
> point fax machine issue or else? Please assist me out to resolve
> this issue at earliest.

Please do not email me directly. I've already responded on list, despite 
wanting to let this sit for a few days in response to you asking for support 
'at earliest'... The Asterisk support list has no SLA, only governed by the 
time and willingness of the members to participate. Thanks.

--Tim

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Re: [asterisk-users] Fax over IP ?

[Ahmed Munir]

On Tue, Jun 5, 2012 at 12:47 PM, Ahmed Munir wrote:

> I figured out the problem. Actually the sending fax machine speed was set
> as 33000 bps, later I set to 14400 bps and in my dial plan, I forcefully
> set to use T.38 protocol. After that I was able to receive fax.
>
> Thanks Tim for assisting me out :).
>
>
>
>> - Original Message -
>>
>> > Hi Tim,
>>
>> > I'm using Asterisk 10 and on Cisco GW the protocol is set for FAX is
>> > T.38 and when I try to send the fax from a fax machine i.e. HP 3180,
>> > I'm getting some warnings as listed below;
>>
>> > -- Executing [4112345678@default:1] Goto("SIP/192.168.1.69-0005",
>> > "fax-detect,fax,1") in new stack
>> > -- Goto (fax-detect,fax,1)
>> > -- Executing [fax@fax-detect:1] NoOp("SIP/192.168.1.69-0005",
>> > " FAX DETECTED ") in new stack
>> > -- Executing [fax@fax-detect:2] Goto("SIP/192.168.1.69-0005",
>> > "fax-receive,receive,1") in new stack
>> > -- Goto (fax-receive,receive,1)
>> > -- Executing [receive@fax-receive:1]
>> > NoOp("SIP/192.168.1.69-0005", " FAX RECEIVE ") in new
>> > stack
>> > -- Executing [receive@fax-receive:2] Set("SIP/192.168.1.69-0005",
>> > "GLOBAL(FAXCOUNT)=5") in new stack
>> > == Setting global variable 'FAXCOUNT' to '5'
>> > -- Executing [receive@fax-receive:3] Set("SIP/192.168.1.69-0005",
>> > "FAXCOUNT=5") in new stack
>> > -- Executing [receive@fax-receive:4] Set("SIP/192.168.1.69-0005",
>> > "FAXFILE=fax-5-rx.tif") in new stack
>> > -- Executing [receive@fax-receive:5] Set("SIP/192.168.1.69-0005",
>> > "GLOBAL(LASTFAXCALLERNUM)=6461234567") in new stack
>> > == Setting global variable 'LASTFAXCALLERNUM' to '6461234567'
>> > -- Executing [receive@fax-receive:6] Set("SIP/192.168.1.69-0005",
>> > "GLOBAL(LASTFAXCALLERNAME)=") in new stack
>> > == Setting global variable 'LASTFAXCALLERNAME' to ''
>> > -- Executing [receive@fax-receive:7]
>> > NoOp("SIP/192.168.1.69-0005", " SETTING FAXOPT ") in new
>> > stack
>> > -- Executing [receive@fax-receive:8] Set("SIP/192.168.1.69-0005",
>> > "FAXOPT(ecm)=yes") in new stack
>> > -- Executing [receive@fax-receive:9] Set("SIP/192.168.1.69-0005",
>> > "FAXOPT(headerinfo)=MY FAXBACK RX") in new stack
>> > -- Executing [receive@fax-receive:10]
>> > Set("SIP/192.168.1.69-0005",
>> > "FAXOPT(localstationid)=1234567890") in new stack
>> > -- Executing [receive@fax-receive:11]
>> > Set("SIP/192.168.1.69-0005", "FAXOPT(maxrate)=14400") in new
>> > stack
>> > -- Executing [receive@fax-receive:12]
>> > Set("SIP/192.168.1.69-0005", "FAXOPT(minrate)=2400") in new
>> > stack
>> > -- Executing [receive@fax-receive:13]
>> > NoOp("SIP/192.168.1.69-0005", "FAXOPT(ecm) : yes") in new stack
>> > -- Executing [receive@fax-receive:14]
>> > NoOp("SIP/192.168.1.69-0005", "FAXOPT(headerinfo) : MY FAXBACK
>> > RX") in new stack
>> > -- Executing [receive@fax-receive:15]
>> > NoOp("SIP/192.168.1.69-0005", "FAXOPT(localstationid) :
>> > 1234567890") in new stack
>> > -- Executing [receive@fax-receive:16]
>> > NoOp("SIP/192.168.1.69-0005", "FAXOPT(maxrate) : 14400") in new
>> > stack
>> > -- Executing [receive@fax-receive:17]
>> > NoOp("SIP/192.168.1.69-0005", "FAXOPT(minrate) : 2400") in new
>> > stack
>> > -- Executing [receive@fax-receive:18]
>> > NoOp("SIP/192.168.1.69-0005", " RECEIVING FAX : fax-5-rx.tif
>> > ") in new stack
>> > -- Executing [receive@fax-receive:19]
>> > ReceiveFAX("SIP/192.168.1.69-0005",
>> > "/var/spool/asterisk/fax/fax-5-rx.tif") in new stack
>> > -- Channel 'SIP/192.168.1.69-0005' receiving FAX
>> > '/var/spool/asterisk/fax/fax-5-rx.tif'
>> > == Using UDPTL CoS mark 5
>> > [Jun 4 12:35:02] NOTICE[10371]: chan_sip.c:7577 sip_read: FAX CNG
>> > detected but no fax extension
>> > [Jun 4 12:35:02] WARNING[10072]: res_fax.c:1666 receivefax_t38_init:
>> > channel 'SIP/192.168.1.69-0005' refused to negotiate T.38
>> > [Jun 4 12:35:02] WARNING[10072]: res_fax.c:1687 receivefax_t38_init:
>> > Audio FAX not allowed on channel 'SIP/192.168.1.69-0005' and
>> > T.38 negotiation failed; aborting.
>> > [Jun 4 12:35:02] ERROR[10072]: res_fax.c:1891 receivefax_exec: error
>> > initializing channel 'SIP/192.168.1.69-0005' in T.38 mode
>> > == Spawn extension (fax-receive, receive, 19) exited non-zero on
>> > 'SIP/192.168.1.69-0005'
>>
>> > In my sip.conf global configuration I enabled 'fax detect' and
>> > 't38pt_udptl' and added Cisco VGW peer;
>>
>> > [CiscoVGW-10.70.X.X]
>> > host=10.70.X.X
>> > type=friend
>> > disallow=all
>> > allow=ulaw
>> > allow=alaw
>> > nat=yes
>> > insecure=port,invite
>> > context=fax-call
>> > canreinvite=no
>> > qualify=yes
>> > dtmfmode=inband
>>
>>
>> T.38 failed to negotiate. That means either your Asterisk side, or your
>> Cisco side are not playing nicely together. A packet capture of the call
>> setup would be helpful to determine which side is having the issues.
>>
>> --Tim
>>
>> --
> Regards,
>
> Ahmed Munir Chohan
>

[Asterisk-Users] Fax over IP doesn't works

[Miroslav Nachev]

   Hi,

   We try to send Fax through IP Network but without success. The
other party use NetCentrex SoftSwitch and our communication protocol
between us is H.323 (OpenH323). The error that the other party receive
is: "bearer capability not imoplemented".

   Is it possible to send Fax using Asterisk to the other party
through IP network? What T.38 and Asterisk?


   Regards,
   Miro.

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Re: [Asterisk-Users] Fax over IP doesn't works

[Pedro Howat Rodrigues]

Hi ,
I tried this a lot, but with no sucess , even in a local network , there 
is always some loss and you receive only chunks of the original file .

Pedro.
Miroslav Nachev wrote:
  Hi,
  We try to send Fax through IP Network but without success. The
other party use NetCentrex SoftSwitch and our communication protocol
between us is H.323 (OpenH323). The error that the other party receive
is: "bearer capability not imoplemented".
  Is it possible to send Fax using Asterisk to the other party
through IP network? What T.38 and Asterisk?
  Regards,
  Miro.
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RE: [Asterisk-Users] Fax over IP doesn't works

[Yiannis Costopoulos]

Well,

assuming that some of these CODECS do error correction and drop any
information that hasn't come through instead of doing error detection and
request to re-transmit the lost information, is somewhat expected. Are there
any Fax over IP protocols?

Yiannis.

> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Pedro Howat
> Rodrigues
> Sent: 19 October 2004 15:53
> To: Miroslav Nachev; Asterisk Users Mailing List - Non-Commercial
> Discussion
> Subject: Re: [Asterisk-Users] Fax over IP doesn't works
>
>
> Hi ,
>
> I tried this a lot, but with no sucess , even in a local network , there
> is always some loss and you receive only chunks of the original file .
>
> Pedro.
>
> Miroslav Nachev wrote:
>
> >   Hi,
> >
> >   We try to send Fax through IP Network but without success. The
> >other party use NetCentrex SoftSwitch and our communication protocol
> >between us is H.323 (OpenH323). The error that the other party receive
> >is: "bearer capability not imoplemented".
> >
> >   Is it possible to send Fax using Asterisk to the other party
> >through IP network? What T.38 and Asterisk?
> >
> >
> >   Regards,
> >   Miro.
> >
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RE: [Asterisk-Users] Fax over IP doesn't works

[Michael Loftis]

Just my $0.02 but seems to me the VoIP community as a whole needs to extend 
SIP (or IAX?) with a special 'fax data' mode wherein the gateways either 
act locally as the modem and queue/push bits (not audio data) for the 
remote end or transparently bridge them through in the case of a 
passthrough call.

IMO faxes need to die, but business still loves them.
As I said, just my $0.02.
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Re: [Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

Yiannis Costopoulos wrote:
Well,
	assuming that some of these CODECS do error correction and drop any
information that hasn't come through instead of doing error detection and
request to re-transmit the lost information, is somewhat expected. Are there
any Fax over IP protocols?
 

Yes. T.38. * doesn't yet support it.
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

Michael Loftis wrote:
Just my $0.02 but seems to me the VoIP community as a whole needs to 
extend SIP (or IAX?) with a special 'fax data' mode wherein the 
gateways either act locally as the modem and queue/push bits (not 
audio data) for the remote end or transparently bridge them through in 
the case of a passthrough call.

IMO faxes need to die, but business still loves them.
As I said, just my $0.02.
That is such a good idea they did it several years ago. Its called T.38 
for H.323 and SIP. IAX doesn't yet have something similar, but its high 
on the list of things to do.

Regards,
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Darren Sessions]

Someone should put a bounty on T38. We're using spandsp right now and 
have had success - but it was an absolute pain to get it to work.

On Oct 19, 2004, at 12:38 PM, Steve Underwood wrote:
Michael Loftis wrote:
Just my $0.02 but seems to me the VoIP community as a whole needs to 
extend SIP (or IAX?) with a special 'fax data' mode wherein the 
gateways either act locally as the modem and queue/push bits (not 
audio data) for the remote end or transparently bridge them through 
in the case of a passthrough call.

IMO faxes need to die, but business still loves them.
As I said, just my $0.02.
That is such a good idea they did it several years ago. Its called 
T.38 for H.323 and SIP. IAX doesn't yet have something similar, but 
its high on the list of things to do.

Regards,
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

So what changes with T.38? You still need spandsp to interwork with the 
PSTN. What was so hard about getting spandsp to work? (I'm genuinely 
interested)

Regards,
Steve
Darren Sessions wrote:
Someone should put a bounty on T38. We're using spandsp right now and 
have had success - but it was an absolute pain to get it to work.

On Oct 19, 2004, at 12:38 PM, Steve Underwood wrote:
Michael Loftis wrote:
Just my $0.02 but seems to me the VoIP community as a whole needs to 
extend SIP (or IAX?) with a special 'fax data' mode wherein the 
gateways either act locally as the modem and queue/push bits (not 
audio data) for the remote end or transparently bridge them through 
in the case of a passthrough call.

IMO faxes need to die, but business still loves them.
As I said, just my $0.02.

That is such a good idea they did it several years ago. Its called 
T.38 for H.323 and SIP. IAX doesn't yet have something similar, but 
its high on the list of things to do.

Regards,
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Darren Sessions]

We used spandsp on the voip side. Our inbound vendor sets the call up 
G711 and spandsp answers. It's a bit slow as it seems to only negotiate 
v29 terbo, but it works.

Finding the correct version of libtiff was a pain. One sub version off, 
and it wouldn't work. Wasn't so much that it was a hard to get it to 
work, just a lot of tweaking to get it to work. Tedious.


On Oct 19, 2004, at 12:50 PM, Steve Underwood wrote:
So what changes with T.38? You still need spandsp to interwork with 
the PSTN. What was so hard about getting spandsp to work? (I'm 
genuinely interested)

Regards,
Steve
Darren Sessions wrote:
Someone should put a bounty on T38. We're using spandsp right now and 
have had success - but it was an absolute pain to get it to work.

On Oct 19, 2004, at 12:38 PM, Steve Underwood wrote:
Michael Loftis wrote:
Just my $0.02 but seems to me the VoIP community as a whole needs 
to extend SIP (or IAX?) with a special 'fax data' mode wherein the 
gateways either act locally as the modem and queue/push bits (not 
audio data) for the remote end or transparently bridge them through 
in the case of a passthrough call.

IMO faxes need to die, but business still loves them.
As I said, just my $0.02.

That is such a good idea they did it several years ago. Its called 
T.38 for H.323 and SIP. IAX doesn't yet have something similar, but 
its high on the list of things to do.

Regards,
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

Darren Sessions wrote:
We used spandsp on the voip side. Our inbound vendor sets the call up 
G711 and spandsp answers. It's a bit slow as it seems to only 
negotiate v29 terbo, but it works.

Finding the correct version of libtiff was a pain. One sub version 
off, and it wouldn't work. Wasn't so much that it was a hard to get it 
to work, just a lot of tweaking to get it to work. Tedious.
It only supports V.29 (there is no terbo) ofor patent reasons. I have 
nearly finished V.17, but I'm unclear if the patent on its trellis 
coding has run out.

libtiff and timing slips are the two big issues, and there is little I 
can do. The recent libtiff security patches should fix most of the 
libtiff issues, I hope. Why so many people have timing problems has 
still to be resolved. Some have been misconfigured E1s/T1s, but there 
seem to be plenty of others. There is nothing I can do about that within 
spandsp.

spandsp on the VoIP side will always be a little flaky, I'm afraid. 
There is little I can do about that either. Building spandsp was 
actually a step towards T.38. That is why I have not been too interested 
in a HylaFAX interface (although one is in progress).

Regards,
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

Miroslav Nachev wrote:
Hello Steve,
There is another way to send fax if you use Fax Machine on some FXS
port.
 

and exactly how does that get the FAX into the T.38 channel? :-\
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

Miroslav Nachev wrote:
Hello Steve,
In the project OpenH323 the T.38 is supported. The easyest way is to
correct Asterisk logic with OpenH323.
 

Maybe, but from a quick look last year it didn't appear easy to make 
their version of T.38 play nicely with *. I've been working on the basis 
that I will do a fresh implementation in C when I have the time (unless 
some nice person beats me to it :-) ).

Regards,
Steve
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Re: [Asterisk-Users] Fax over IP doesn't works

[Michael Welter]

Steve Underwood wrote:
So what changes with T.38? You still need spandsp to interwork with the 
PSTN. What was so hard about getting spandsp to work? (I'm genuinely 
interested)
I switched to spandsp rather that purchase an expensive multi-port 
FaxModem card for a fax server.

I've had absolutely no problems with spandsp.  I've got rxfax to email 
working now, and I'm presently working on print-to-fax from a Windows 
client using txfax.  I don't have a T-1 on the system, yet.  When that 
is installed we'll do some load testing.

I had no trouble installing spandsp into Asterisk, and I have had no 
problems using spandsp with a $30 Sharp UX-P200 or an HP 3150.   Don't 
know about older machines.

Thank you, Steve, for all your good work.  We all appreciate your efforts.
Mike
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Re: [Asterisk-Users] Fax over IP doesn't works

[Dave Cotton]

On Tue, 2004-10-19 at 11:59 -0600, Michael Welter wrote:

> I've had absolutely no problems with spandsp.  I've got rxfax to email 
> working now

Any chance of a clue as to how you did it?

I've had some success utilities from Hylafax, it works perfectly on one
machine but fails on my actual * box.

 
-- 
Dave Cotton <[EMAIL PROTECTED]>

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Re: [Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

Hi Miroslav,
It sounds like you don't really understand what T.38 is. You need some 
form of modem to get from a normal FAX machine to a T.38 channel. 
spandsp can do that. A normal FAX modem can do that. You need a modem 
somewhere, though. That is why developing the FAX modems was the first 
step towards providing T.38.

Regrds,
Steve
Miroslav Nachev wrote:
  Dear Steve,
SU> So how does the FAX get from the fax machine to the T.38 channel
SU> with spandsp?
  In our case we will try to strip spandsp and will use directly
OpenH323. We do tests for compatibility with one of the biggest
national telecom and if they are OK, they will offer Asterisk based IP
PBX to their clients instead Cisco. That's why we need of T.38 and
G.711 fax capabilities.
  Also we have the problems with the following tests:
  1. When Dialing of unallocated number the resposne must be "Invalid
 Number", but the result is one of the following: Hangup,
 Congestion or Busy.
  2. CLIP/CLIR User provided verified and passed - We can't find
 where we can set this bits for this services.
  3. Fax T38 / g711
  4. Codec negotiation: when 2 codecs are possible (G.711 and G.729),
 the two parties can't negotiate which codec to use.
  Best Regards,
  Miroslav Nachev
  
Miroslav Nachev wrote:

 

SU> and exactly how does that get the FAX into the T.38 channel? :-\
 Using G.711 or implementing T.38 in Asterisk or adjusting Asterisk
to OpenH323 T.38. From our expirience Asterisk detect that the line is
with Fax data. The problem is what next.

   

So how does the FAX get from the fax machine to the T.38 channel with
spandsp?
Regards,
Steve
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[asterisk-users] fax over IP - http/ftp-provisioning - intercom

[jonas kellens]

Dear members of the list,

a customer of mine has some questions and I would like to pose some of
them further to you guys.

What is the situation with Asterisk and fax over IP ? Can Asterisk
receive a fax over a POTS or ISDN line ?? Do I then need a Digium
TDM-card and an FXO-module or a T38-gateway ?

What phones should I use to automatically configure them from a central
place via HTTP or FTP ? I know Polycom-phones offer this option.

How can I implement intercom functionality ? Which phones have
auto-answer ? And how do I implement this in the Asterisk dialplan ??


I'm used to working with Asterisk 1.4. I hope the above is possible in
an 1.4 environment.

Thank you for your feedback.

Jonas.
-- 
_
-- Bandwidth and Colocation Provided by http://www.api-digital.com --

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Re[2]: [Asterisk-Users] Fax over IP doesn't works

[Miroslav Nachev]

Hi,

YC> assuming that some of these CODECS do error correction and drop
YC> any information that hasn't come through instead of doing error
YC> detection and  request to re-transmit the lost information, is
YC> somewhat expected. Are there any Fax over IP protocols?

   There are two ways to send a fax throuhg IP:
   1. If Asterisk detect the Fax to use G.711
  or
   2. T.38 protocol which is exactly for that.
   The problem maybe is that Asterisk doesn't support both ways.


-- 
Best regards,
 Miroslavmailto:[EMAIL PROTECTED]



YC> Yiannis.

>> -Original Message-
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] Behalf Of Pedro Howat
>> Rodrigues
>> Sent: 19 October 2004 15:53
>> To: Miroslav Nachev; Asterisk Users Mailing List - Non-Commercial
>> Discussion
>> Subject: Re: [Asterisk-Users] Fax over IP doesn't works
>>
>>
>> Hi ,
>>
>> I tried this a lot, but with no sucess , even in a local network , there
>> is always some loss and you receive only chunks of the original file .
>>
>> Pedro.
>>
>> Miroslav Nachev wrote:
>>
>> >   Hi,
>> >
>> >   We try to send Fax through IP Network but without success. The
>> >other party use NetCentrex SoftSwitch and our communication protocol
>> >between us is H.323 (OpenH323). The error that the other party receive
>> >is: "bearer capability not imoplemented".
>> >
>> >   Is it possible to send Fax using Asterisk to the other party
>> >through IP network? What T.38 and Asterisk?
>> >
>> >
>> >   Regards,
>> >   Miro.
>> >
>> >___
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Re[2]: [Asterisk-Users] Fax over IP doesn't works

[Miroslav Nachev]

Hello Steve,

There is another way to send fax if you use Fax Machine on some FXS
port.


-- 
Best regards,
 Miroslavmailto:[EMAIL PROTECTED]

Tuesday, October 19, 2004, 7:50:52 PM, you wrote:

SU> So what changes with T.38? You still need spandsp to interwork with the
SU> PSTN. What was so hard about getting spandsp to work? (I'm genuinely
SU> interested)

SU> Regards,
SU> Steve

SU> Darren Sessions wrote:

>> Someone should put a bounty on T38. We're using spandsp right now and
>> have had success - but it was an absolute pain to get it to work.
>>
>> On Oct 19, 2004, at 12:38 PM, Steve Underwood wrote:
>>
>>> Michael Loftis wrote:
>>>
 Just my $0.02 but seems to me the VoIP community as a whole needs to
 extend SIP (or IAX?) with a special 'fax data' mode wherein the 
 gateways either act locally as the modem and queue/push bits (not
 audio data) for the remote end or transparently bridge them through
 in the case of a passthrough call.

 IMO faxes need to die, but business still loves them.

 As I said, just my $0.02.
>>>
>>>
>>> That is such a good idea they did it several years ago. Its called
>>> T.38 for H.323 and SIP. IAX doesn't yet have something similar, but
>>> its high on the list of things to do.
>>>
>>> Regards,
>>> Steve
>>>
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Re[2]: [Asterisk-Users] Fax over IP doesn't works

[Miroslav Nachev]

Hello Steve,

In the project OpenH323 the T.38 is supported. The easyest way is to
correct Asterisk logic with OpenH323.


-- 
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 Miroslavmailto:[EMAIL PROTECTED]

Tuesday, October 19, 2004, 7:38:19 PM, you wrote:

SU> Michael Loftis wrote:

>> Just my $0.02 but seems to me the VoIP community as a whole needs to
>> extend SIP (or IAX?) with a special 'fax data' mode wherein the 
>> gateways either act locally as the modem and queue/push bits (not 
>> audio data) for the remote end or transparently bridge them through in
>> the case of a passthrough call.
>>
>> IMO faxes need to die, but business still loves them.
>>
>> As I said, just my $0.02.

SU> That is such a good idea they did it several years ago. Its called T.38
SU> for H.323 and SIP. IAX doesn't yet have something similar, but its high
SU> on the list of things to do.

SU> Regards,
SU> Steve

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Re[2]: [Asterisk-Users] Fax over IP doesn't works

[Miroslav Nachev]

   Dear Steve,

SU> So how does the FAX get from the fax machine to the T.38 channel
SU> with spandsp?

   In our case we will try to strip spandsp and will use directly
OpenH323. We do tests for compatibility with one of the biggest
national telecom and if they are OK, they will offer Asterisk based IP
PBX to their clients instead Cisco. That's why we need of T.38 and
G.711 fax capabilities.
   Also we have the problems with the following tests:
   1. When Dialing of unallocated number the resposne must be "Invalid
  Number", but the result is one of the following: Hangup,
  Congestion or Busy.
   2. CLIP/CLIR User provided verified and passed - We can't find
  where we can set this bits for this services.
   3. Fax T38 / g711
   4. Codec negotiation: when 2 codecs are possible (G.711 and G.729),
  the two parties can't negotiate which codec to use.


   Best Regards,
   Miroslav Nachev

   
Miroslav Nachev wrote:

>SU> and exactly how does that get the FAX into the T.38 channel? :-\
>
>   Using G.711 or implementing T.38 in Asterisk or adjusting Asterisk
>to OpenH323 T.38. From our expirience Asterisk detect that the line is
>with Fax data. The problem is what next.
>
>  
>
So how does the FAX get from the fax machine to the T.38 channel with
spandsp?

Regards,
Steve

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Re[2]: [Asterisk-Users] Fax over IP doesn't works

[Miroslav Nachev]

   Dear Steve,

   I can't understand from your mail can I use SpanDSP or not?

   Today we try this fax-modem:
   http://www.openh323.org/t38.html
   The problem now is that we can't start it with HylaFAX.
   

   Best Regards,
   Miroslav Nachev

SU> Hi Miroslav,

SU> It sounds like you don't really understand what T.38 is. You need some
SU> form of modem to get from a normal FAX machine to a T.38 channel. 
SU> spandsp can do that. A normal FAX modem can do that. You need a modem
SU> somewhere, though. That is why developing the FAX modems was the first
SU> step towards providing T.38.

SU> Regrds,
SU> Steve


SU> Miroslav Nachev wrote:

>>   Dear Steve,
>>
>>SU> So how does the FAX get from the fax machine to the T.38 channel
>>SU> with spandsp?
>>
>>   In our case we will try to strip spandsp and will use directly
>>OpenH323. We do tests for compatibility with one of the biggest
>>national telecom and if they are OK, they will offer Asterisk based IP
>>PBX to their clients instead Cisco. That's why we need of T.38 and
>>G.711 fax capabilities.
>>   Also we have the problems with the following tests:
>>   1. When Dialing of unallocated number the resposne must be "Invalid
>>  Number", but the result is one of the following: Hangup,
>>  Congestion or Busy.
>>   2. CLIP/CLIR User provided verified and passed - We can't find
>>  where we can set this bits for this services.
>>   3. Fax T38 / g711
>>   4. Codec negotiation: when 2 codecs are possible (G.711 and G.729),
>>  the two parties can't negotiate which codec to use.
>>
>>
>>   Best Regards,
>>   Miroslav Nachev
>>
>>   
>>Miroslav Nachev wrote:
>>
>>  
>>
>>>SU> and exactly how does that get the FAX into the T.38 channel? :-\
>>>
>>>  Using G.711 or implementing T.38 in Asterisk or adjusting Asterisk
>>>to OpenH323 T.38. From our expirience Asterisk detect that the line is
>>>with Fax data. The problem is what next.
>>>
>>> 
>>>
>>>
>>>
>>So how does the FAX get from the fax machine to the T.38 channel with
>>spandsp?
>>
>>Regards,
>>Steve
>>
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Re: [asterisk-users] fax over IP - http/ftp-provisioning - intercom

[Alex Balashov]

On 01/23/2010 09:11 AM, jonas kellens wrote:

> Dear members of the list,
>
> a customer of mine has some questions and I would like to pose some of
> them further to you guys.
>
> What is the situation with Asterisk and fax over IP ? Can Asterisk
> receive a fax over a POTS or ISDN line ?? Do I then need a Digium
> TDM-card and an FXO-module or a T38-gateway ?

Despite what anyone may say about Fax over IP allegedly works for them, 
save yourself the trouble and make sure you take the POTS and ISDN 
approach.

> What phones should I use to automatically configure them from a central
> place via HTTP or FTP ? I know Polycom-phones offer this option.

Most major phone vendors offer provisioning of this nature.

> How can I implement intercom functionality ? Which phones have
> auto-answer ? And how do I implement this in the Asterisk dialplan ??

Polycom supports this, and I am quite sure Snom does too.  Perhaps some 
others.

As far as how to implement it, that is manufacturer-specific.  Look on 
voip-info.org for "Polycom" and "paging" if you want the Polycom-centric 
answer.  For other phones, it will be different.

-- 
Alex Balashov - Principal
Evariste Systems LLC

Tel: +1 678-954-0670
Direct : +1 678-954-0671
Web: http://www.evaristesys.com/

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Re: [asterisk-users] fax over IP - http/ftp-provisioning - intercom

[jonas kellens]

On Sat, 2010-01-23 at 21:19 -0500, Alex Balashov wrote:

> > What is the situation with Asterisk and fax over IP ? Can Asterisk
> > receive a fax over a POTS or ISDN line ?? Do I then need a Digium
> > TDM-card and an FXO-module or a T38-gateway ?
> 
> Despite what anyone may say about Fax over IP allegedly works for them, 
> save yourself the trouble and make sure you take the POTS and ISDN 
> approach.


If I keep the POTS-line or the ISDN-line, can Asterisk then transform an
incoming fax to an email with pdf or tiff attachment ??
And the other way around, can an email to the Asterisk-server be
transformed to an analogue fax ??

Jonas.
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