[asterisk-users] T38 FAX

[michel freiha]

Dear All,

I'm trying to send FAX to an endpoint Behind NAT...The scenario i the
following:

PSTN_GW-->Asterisk-->asterisk-->OpenSIPS-->Endpoint behind NAT..

The FAX is failed and I got the following error log on asterisk:

Mar 20 09:21:09] WARNING[20388]: chan_sip.c:12409 handle_response_invite:
Re-invite to non-existing call leg on other UA. SIP dialog
'76c64f8373def68d5088690816c67...@asterisk_ip'. Giving up.

Please find the whole trace at http://pastebin.com/d764514b4

Can you please help me in order to find the real issue?
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[asterisk-users] T38 Fax

[Robert Huddleston]

Anyone have any testing experience with T38 and HT-502 Grandstream?

 

I just want to confirm that t.38 is working on this device.

 

Thanks

 

 

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Re: [asterisk-users] T38 FAX

[David Backeberg]

On Fri, Mar 20, 2009 at 5:36 AM, michel freiha  wrote:
> Can you please help me in order to find the real issue?

Try taking out three or four pieces of your architecture, and then try again.

How about PSTN -> Asterisk?

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[asterisk-users] T38 fax failing

[Michael]

Fax over T38 is failing, on the same system it worked with Callweaver.

What do I need to post to be get further assistance please?

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Re: [asterisk-users] T38 Fax

[Larry Moore]

On 2/08/2011 1:02 AM, Robert Huddleston wrote:


Anyone have any testing experience with T38 and HT-502 Grandstream?

I just want to confirm that t.38 is working on this device.

Thanks




Yes, it works.

I currently have latest firmware installed and it still works in T.38. I 
am using UDP transport for this device as I seem to encounter problems 
with TCP or TLS.


I am currently running Asterisk 1.8.5.0.

*Product Model: * HT-502 V1.1C
*Software Version: * 	  Program-- 1.0.5.5Bootloader-- 1.0.0.9 
   Core-- 1.0.5.2Base-- 1.0.5.2



Some settings I have set and you may wish to check for the FXS port are;

/Force INVITE: /No Yes (Always refresh with INVITE instead of UPDATE)
/Send Re-INVITE After Fax: /No Yes


/VAD: / No Yes
/Symmetric RTP: /   No Yes
/Fax mode: /T.38 (Auto Detect) Pass-Through
/Fax tone detection mode: / Caller Callee Caller or Callee
/Jitter buffer type: /  Fixed Adaptive
/Jitter buffer length: /Low Medium High



You will need to ensure you are using redundancy mode instead of FEC.

I am able to send a fax via my voice provider seemingly without errors 
even though ECM is not enabled, this is because redundancy mode is 
working as expected on the outbound communication.


Unfortunately my voice provider only sends one data item in the incoming 
UDPTL hence the occasional missed line.


Here is an extract from my sip.conf

[general]
.
.
t38pt_udptl=yes,redundancy,maxdatagram=400
.
.
[906]
; Grandstream HT502 FXS Port
; Analogue FAX Modem attached
type=friend
defaultuser=906
md5secret=c5bca943c9b0cc303c496fbf9d48a48e
call-limit=1
disallow=g722
transport=udp
qualify=yes
directmedia=no
host=dynamic
context=FAX-T38
faxdetect=no
deny=0.0.0.0/0.0.0.0
permit=10.0.0.0/255.0.0.0
permit=172.16.0.0/255.240.0.0
permit=192.168.0.0/255.255.0.0

Larry.
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Re: [asterisk-users] T38 Fax

[Robert Huddleston]

Thanks - and did you find a provider with T.38 DIDs? I don't see many pay as
you go providers with T.38

 

From: asterisk-users-boun...@lists.digium.com
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Larry Moore
Sent: Monday, August 01, 2011 4:08 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] T38 Fax

 

On 2/08/2011 1:02 AM, Robert Huddleston wrote: 

Anyone have any testing experience with T38 and HT-502 Grandstream?

 

I just want to confirm that t.38 is working on this device.

 

Thanks

 

 


Yes, it works.

I currently have latest firmware installed and it still works in T.38. I am
using UDP transport for this device as I seem to encounter problems with TCP
or TLS.

I am currently running Asterisk 1.8.5.0.


Product Model: 

  HT-502 V1.1C 


Software Version: 

  Program-- 1.0.5.5Bootloader-- 1.0.0.9Core-- 1.0.5.2Base--
1.0.5.2


Some settings I have set and you may wish to check for the FXS port are;


Force INVITE: 

  (X) No ( ) Yes (Always refresh with INVITE instead of UPDATE)


Send Re-INVITE After Fax: 

  ( ) No (X) Yes 

 


VAD: 

  ( ) No   (X) Yes 


Symmetric RTP: 

  (X) No   ( ) Yes 


Fax mode: 

  (X) T.38 (Auto Detect)   ( ) Pass-Through 


Fax tone detection mode: 

  ( ) Caller   (X) Callee   ( ) Caller or Callee


Jitter buffer type: 

  (X) Fixed   ( ) Adaptive 


Jitter buffer length: 

  (X) Low ( ) Medium   ( ) High 



You will need to ensure you are using redundancy mode instead of FEC.

I am able to send a fax via my voice provider seemingly without errors even
though ECM is not enabled, this is because redundancy mode is working as
expected on the outbound communication.

Unfortunately my voice provider only sends one data item in the incoming
UDPTL hence the occasional missed line.

Here is an extract from my sip.conf

[general]
.
.
t38pt_udptl=yes,redundancy,maxdatagram=400
.
.
[906]
; Grandstream HT502 FXS Port
; Analogue FAX Modem attached
type=friend
defaultuser=906
md5secret=c5bca943c9b0cc303c496fbf9d48a48e
call-limit=1
disallow=g722
transport=udp
qualify=yes
directmedia=no
host=dynamic
context=FAX-T38
faxdetect=no
deny=0.0.0.0/0.0.0.0
permit=10.0.0.0/255.0.0.0
permit=172.16.0.0/255.240.0.0
permit=192.168.0.0/255.255.0.0

Larry.

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Re: [asterisk-users] T38 Fax

[Larry Moore]

On 2/08/2011 4:13 AM, Robert Huddleston wrote:


Thanks -- and did you find a provider with T.38 DIDs? I don't see many 
pay as you go providers with T.38





I am not looking for VoIP providers for such functionality and is 
subjective to geographic location, however I am of the opinion that one 
should have a PSTN line connected directly to a fax device at CPE for 
receiving said communications and one could use T.38 for Outbound faxing 
providing the transmissions are of high enough quality


Larry..


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[asterisk-users] T38 fax gateway announcement

[Daniel Ferenci]

Hi,

there is http://bugs.digium.com/view.php?id=13405 updated version of fax
(T38) gateway.
Your bug reports and questions are welcome.

Thank you in advance.

Best regards
Daniel.
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Re: [asterisk-users] T38 fax failing

[David Backeberg]

On Mon, Apr 20, 2009 at 5:34 AM, Michael  wrote:
> Fax over T38 is failing, on the same system it worked with Callweaver.

Some people claim great success with callweaver. If Callweaver is
working great for you, why change what works?

> What do I need to post to be get further assistance please?

version of spandsp
version of asterisk
relevant sections of sip.conf
relevant sections of dialplan/callfile/however you initiate the fax
verbose call trace with error code/message

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[asterisk-users] T38 FAX over a Broadsoft

[eng. Anatoli Marinov]

I have a problem with sending a T38 FAX over a Broadsoft server.

I am sending to a PSTN FAX so the Broadsoft server is terminating SIP
point and it should send me REINVITE for T38 but it does not. It is
just accepting the FAX transmission over G711.

My question is there some specific advertisement(media attribute or
media description) which I should add in my initial INVITE request to
the Broadsoft server to make it understand that I support T38?

I saw also something called "Broadsoft FAX Messaging" but did not find
any description.


-- 
Best Regards
eng. Anatoli Marinov

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[asterisk-users] T38 fax detection using g729

[Niccolò Belli]

Hi, I continue the discussion from
https://issues.asterisk.org/view.php?id=19103

If T.38 reinvite detection should still work, why it doesn't?
If I use faxdetect = t38 it does never detect the fax, even using alaw.

Cheers,
Darkbasic

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[asterisk-users] T38 fax solution with Asterisk possible?

[mark morreny]

Hi,

I am looking for a very low cost way of receiving and sending T38 fax
reliably.  Is there any possible solution using Asterisk as the PSTN SIP
gateay and Digium E1/T1 card?  Is there other open source package that can
help to accomplish this purpose?

Regards,
Mark
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[asterisk-users] T38 Fax Gateway for Asterisk 1.6

[James Lamanna]

Hi,
I remember seeing a T38 Gateway application for Asterisk 1.6 floating
around, but I can't seem to find it again.
Does anyone have any pointers to it? I really want to be able to send
an incoming T38 connection directly to the PSTN.

Thanks.

-- James

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Re: [asterisk-users] T38 fax detection using g729

[Larry Moore]

On 13/04/2011 10:14 PM, Niccolò Belli wrote:

Hi, I continue the discussion from
https://issues.asterisk.org/view.php?id=19103

If T.38 reinvite detection should still work, why it doesn't?
If I use faxdetect = t38 it does never detect the fax, even using alaw.



That is because the remote endpoint, eutelia, will need to detect the 
Fax Tones and send the T.38 ReINVITE to you, they may not have T.38 enabled.


It would appear in your case your Asterisk installation will need to 
detect the Fax Tones so as to make the decision the incoming call is a 
fax and then switch to the fax extension. For Asterisk to detect the Fax 
Tones you will need to set faxdetect to either yes or cng, you will also 
require using alaw or ulaw codec.


As a suggestion you could configure your incoming calls from eutelia to 
go directly to the fax receive function whilst having the g729 codec 
enabled, I expect you will then see T.38 re-invite come from Asterisk.


What is in your configuration for 159?

Larry.

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Re: [asterisk-users] T38 fax detection using g729

[Niccolò Belli]

Il 13/04/2011 19:54, Larry Moore ha scritto:
> That is because the remote endpoint, eutelia, will need to detect the
> Fax Tones and send the T.38 ReINVITE to you, they may not have T.38
> enabled.

Uhm... it's very unlikely.

> As a suggestion you could configure your incoming calls from eutelia to
> go directly to the fax receive function whilst having the g729 codec
> enabled, I expect you will then see T.38 re-invite come from Asterisk.

See attachment from bug https://issues.asterisk.org/view.php?id=19100
Doesn't Eutelia send a T.38 re-invite there?

Anyway I will check again making a packet dump to be sure.

> What is in your configuration for 159?

[159]
language=it
type=friend
qualify=yes ;ping per controllo stato
dtmfmode = rfc2833
context=phones-sip
host=dynamic
disallow=all
allow=g729
secret=mysecret

Cheers,
Darkbasic

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Re: [asterisk-users] T38 fax detection using g729

[Larry Moore]

On 14/04/2011 7:25 AM, Niccolò Belli wrote:

Il 13/04/2011 19:54, Larry Moore ha scritto:

That is because the remote endpoint, eutelia, will need to detect the
Fax Tones and send the T.38 ReINVITE to you, they may not have T.38
enabled.

Uhm... it's very unlikely.



I made a suggestion on how you could check this i.e. have your incoming 
call go directly to the fax extension, my 1.8.3.2 installation 
immediately negotiates a T.38 connection in this sceanrio, of course I 
enabled the fallback option so it will use g711a if T.38 is not accepted 
by the peer.



As a suggestion you could configure your incoming calls from eutelia to
go directly to the fax receive function whilst having the g729 codec
enabled, I expect you will then see T.38 re-invite come from Asterisk.

See attachment from bug https://issues.asterisk.org/view.php?id=19100
Doesn't Eutelia send a T.38 re-invite there?



You did not make reference to this article in your original post, I 
viewed both log files in the article you referenced there, I would 
suggest you search for the word "udptl" and see if you can find where a 
T.38 negotiation occurred.



Anyway I will check again making a packet dump to be sure.

What is in your configuration for 159?
The reason I asked this was because the log files I perused indicated 
this peer does not support UDPTL.



[159]
language=it
type=friend
qualify=yes ;ping per controllo stato
dtmfmode = rfc2833
context=phones-sip
host=dynamic
disallow=all
allow=g729
secret=mysecret



Larry.

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Re: [asterisk-users] T38 fax detection using g729

[Niccolò Belli]

Il 14/04/2011 12:25, Larry Moore ha scritto:
> I made a suggestion on how you could check this i.e. have your incoming
> call go directly to the fax extension, my 1.8.3.2 installation
> immediately negotiates a T.38 connection in this sceanrio, of course I
> enabled the fallback option so it will use g711a if T.38 is not accepted
> by the peer.

Yeah, I know, I just didn't have time to check it. Now I've just
finished checking and Eutelia DOESN'T send any T.38 re-invite :(
I hoped it was an asterisk bug because there was a chance it may be
solved, now that I know it's an Eutelia problem I know it will never be
fixed.
I sent them an e-mail but I already know the answer: "T-38-what?" -.-

Unfortunately it's the only provider which gives unlimited free Italian
numbers.

Thank you,
Darkbasic

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Re: [asterisk-users] T38 fax detection using g729

[Larry Moore]

On 14/04/2011 6:57 PM, Niccolò Belli wrote:

Il 14/04/2011 12:25, Larry Moore ha scritto:

I made a suggestion on how you could check this i.e. have your incoming
call go directly to the fax extension, my 1.8.3.2 installation
immediately negotiates a T.38 connection in this sceanrio, of course I
enabled the fallback option so it will use g711a if T.38 is not accepted
by the peer.

Yeah, I know, I just didn't have time to check it. Now I've just
finished checking and Eutelia DOESN'T send any T.38 re-invite :(
I hoped it was an asterisk bug because there was a chance it may be
solved, now that I know it's an Eutelia problem I know it will never be
fixed.
I sent them an e-mail but I already know the answer: "T-38-what?" -.-


It could possibly work,

sip.conf

[general]
.
.
preferred_codec_only=no
disallow=all
allow=alaw,g729 ; alaw required for T.30 facsimile if T.38 fails to 
negotiate

faxdetect=no
t38pt_udptl=yes,redundancy,maxdatagram=400
.
.
[eutelia]
language=it
type=peer
host=voip.eutelia.it
username=my-eutelia-number
fromuser=my-eutelia-number
secret=my-secret
qualify=yes ;ping per controllo stato
directmedia=no ;asterisk viene sempre usato come media proxy
dtmfmode=auto
insecure=invite,port
context=eutelia-in
callbackextension=s
faxdetect=yes
t38pt_udptl=yes,redundancy,maxdatagram=400


N.B. I use callbackextension in the peer config rather than register in 
the general section.


I use extensions.ael rather than the .conf version hence I would use 
something like this


context eutelia-in {

s => {
Set(CHANNEL(language)=it);
Answer();
Ringing();
Wait(8);
Dial(SIP/159,,30);
Hangup();
};

fax => {
Set(FAXFILE=/var/spool/asterisk/fax/prova4.tif);
ReceiveFAX(${FAXFILE},f);
Hangup();
};

Larry.

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Re: [asterisk-users] T38 fax detection using g729

[Niccolò Belli]

Il 14/04/2011 14:34, Larry Moore ha scritto:
> allow=alaw,g729 ; alaw required for T.30 facsimile if T.38 fails to

I didn't understand the point. If you enable both alaw and g729 it will
simply use the preferred one: if it's g729 tone based detection will
still not work, if it's alaw I will still use that bandwidth expensive
codec. Please explain me because I can't get the point.

Cheers,
Darkbasic

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Re: [asterisk-users] T38 fax detection using g729

[Larry Moore]

On 14/04/2011 10:16 PM, Niccolò Belli wrote:

Il 14/04/2011 14:34, Larry Moore ha scritto:

allow=alaw,g729 ; alaw required for T.30 facsimile if T.38 fails to

I didn't understand the point. If you enable both alaw and g729 it will
simply use the preferred one: if it's g729 tone based detection will
still not work, if it's alaw I will still use that bandwidth expensive
codec. Please explain me because I can't get the point.



The point is simple, fax tone detection and T.30 signalling will require 
a high bandwidth codec, g729 will not work, there are plenty of articles 
out there on this.


Having the g729 codec allows you to have it in your handset 
configuration as the only codec and thus your voice conversations will 
use the lower bandwidth codec.


In my simple observations I have observed T.38 bandwidth consumption at 
around 5Kbps and 10Kbps, the exact reason for 10Kbps I have not 
concluded upon however, a g711a voice conversation consumes around 
10Kbps bandwidth with a packetisation time of 20ms.


Another option to reduce the amount of data traversing the internet is 
to enable VAD, it appears as though this may now work in Asterisk 1.8. I 
had experimented some time back in 1.6 with this hence in sip.conf I have;


directmedia=yes
directrtpsetup=yes

in my general section so they are active in my extensions used by 
handsets and I explicitly disable them for an extension that has a 
fax-modem attached to an ATA.  for a Voice call the RTP stream gets 
established directly to my VoIP providers system and if I want to send a 
fax from a fax-modem, whether or not T.38 is negotiated the RTP stream 
goes through Asterisk.


Larry.

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Re: [asterisk-users] T38 fax detection using g729

[Kevin P. Fleming]

On 04/14/2011 05:57 AM, Niccolò Belli wrote:

Il 14/04/2011 12:25, Larry Moore ha scritto:

I made a suggestion on how you could check this i.e. have your incoming
call go directly to the fax extension, my 1.8.3.2 installation
immediately negotiates a T.38 connection in this sceanrio, of course I
enabled the fallback option so it will use g711a if T.38 is not accepted
by the peer.


Yeah, I know, I just didn't have time to check it. Now I've just
finished checking and Eutelia DOESN'T send any T.38 re-invite :(
I hoped it was an asterisk bug because there was a chance it may be
solved, now that I know it's an Eutelia problem I know it will never be
fixed.


If you are the receiver of the call (and thus they are the sender of the 
call), it is *your* system's responsibility to initiate the switch to 
T.38, not theirs.


Note that switching to T.38 and 'faxdetect' are two different, but 
related, things. You are correct in that if you are using G.729 for the 
voice path for an incoming call, then detecting the CNG tone from the 
calling FAX machine will probably not be detected 100% reliably. If you 
are going to have a DID be able to accept both voice and FAX calls, and 
discriminate between them based on detection of the CNG tone, then 
you'll probably have to switch to G.711 a-Law in order to have the most 
reliable detection.


If you are getting free phone numbers, though, you'd be far better off 
to just assign a dedicated number for incoming FAX calls and not rely on 
'faxdetect' at all; this would allow you to use G.729 for your voice calls.


--
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Digium, Inc. | Director of Software Technologies
Jabber: kflem...@digium.com | SIP: kpflem...@digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org

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Re: [asterisk-users] T38 fax detection using g729

[Niccolò Belli]

Il 19/04/2011 23:41, Kevin P. Fleming ha scritto:
> If you are the receiver of the call (and thus they are the sender of the
> call), it is *your* system's responsibility to initiate the switch to
> T.38, not theirs.

Are you sure? So what's faxdetect=t38 for?

Cheers,
Darkbasic

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Re: [asterisk-users] T38 fax detection using g729

[Kevin P. Fleming]

On 04/20/2011 04:55 AM, Niccolò Belli wrote:

Il 19/04/2011 23:41, Kevin P. Fleming ha scritto:

If you are the receiver of the call (and thus they are the sender of the
call), it is *your* system's responsibility to initiate the switch to
T.38, not theirs.


Are you sure? So what's faxdetect=t38 for?


"Be strict in what you send, and liberal in what you accept."

It's there to compensate for calling endpoints that *do* initiate the 
switch to T.38 even though that's not the recommended behavior.


And after spending a couple of years working on T.38, yes, I am sure. It 
is the receiver's responsibility to switch to T.38 because only the 
receiver can determine whether a FAX terminal has answered the call. If 
the sender switches to T.38 based on CNG detection, the session could 
switch to T.38 when it was answered by a person, or even before the call 
has been answered.


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Re: [asterisk-users] T38 fax solution with Asterisk possible?

[Rob Hillis]

mark morreny wrote:
> Hi,
>
> I am looking for a very low cost way of receiving and sending T38 fax 
> reliably.  Is there any possible solution using Asterisk as the PSTN 
> SIP gateay and Digium E1/T1 card?  Is there other open source package 
> that can help to accomplish this purpose?

Asterisk is not yet capable of performing as a T.38 gateway.  If you 
need this functionality, look at CallWeaver which is a fork of Asterisk 
1.2 and is fully capable of working with T.38.  Don't let the fact that 
it's a release candidate put you off - CallWeaver releases tend to be 
rock solid, and the only reason they haven't released yet is that 
CallWeaver hasn't yet been ported to all platforms they're targeting.

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Re: [asterisk-users] T38 fax solution with Asterisk possible?

[Olivier]

I thought that 1.6 carried along T.38 origination-termination capabilities.
Is it true ?

2008/5/22 Rob Hillis <[EMAIL PROTECTED]>:

> mark morreny wrote:
> > Hi,
> >
> > I am looking for a very low cost way of receiving and sending T38 fax
> > reliably.  Is there any possible solution using Asterisk as the PSTN
> > SIP gateay and Digium E1/T1 card?  Is there other open source package
> > that can help to accomplish this purpose?
>
> Asterisk is not yet capable of performing as a T.38 gateway.  If you
> need this functionality, look at CallWeaver which is a fork of Asterisk
> 1.2 and is fully capable of working with T.38.  Don't let the fact that
> it's a release candidate put you off - CallWeaver releases tend to be
> rock solid, and the only reason they haven't released yet is that
> CallWeaver hasn't yet been ported to all platforms they're targeting.
>
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Re: [asterisk-users] T38 fax solution with Asterisk possible?

[Rob Hillis]

Some.  Apparently not complete - and not capable of acting as a gateway.

Olivier wrote:
I thought that 1.6 carried along T.38 origination-termination 
capabilities.

Is it true ?

2008/5/22 Rob Hillis <[EMAIL PROTECTED] 
>:


mark morreny wrote:
> Hi,
>
> I am looking for a very low cost way of receiving and sending
T38 fax
> reliably.  Is there any possible solution using Asterisk as the PSTN
> SIP gateay and Digium E1/T1 card?  Is there other open source
package
> that can help to accomplish this purpose?

Asterisk is not yet capable of performing as a T.38 gateway.  If you
need this functionality, look at CallWeaver which is a fork of
Asterisk
1.2 and is fully capable of working with T.38.  Don't let the fact
that
it's a release candidate put you off - CallWeaver releases tend to be
rock solid, and the only reason they haven't released yet is that
CallWeaver hasn't yet been ported to all platforms they're targeting.

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!DSPAM:4835181c65721445615627!


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Re: [asterisk-users] T38 fax solution with Asterisk possible?

[Olivier]

2008/5/22 Rob Hillis <[EMAIL PROTECTED]>:

>  Some.  Apparently not complete - and not capable of acting as a gateway.
>

May I ask someone to elaborate, a bit ?
Including fellow applications (rxfax, ...), what is missing to act as a
T.30-to-T.38 gateway ?


>
>
> Olivier wrote:
>
> I thought that 1.6 carried along T.38 origination-termination capabilities.
> Is it true ?
>
> 2008/5/22 Rob Hillis <[EMAIL PROTECTED]>:
>
>>  mark morreny wrote:
>> > Hi,
>> >
>> > I am looking for a very low cost way of receiving and sending T38 fax
>> > reliably.  Is there any possible solution using Asterisk as the PSTN
>> > SIP gateay and Digium E1/T1 card?  Is there other open source package
>> > that can help to accomplish this purpose?
>>
>>  Asterisk is not yet capable of performing as a T.38 gateway.  If you
>> need this functionality, look at CallWeaver which is a fork of Asterisk
>> 1.2 and is fully capable of working with T.38.  Don't let the fact that
>> it's a release candidate put you off - CallWeaver releases tend to be
>> rock solid, and the only reason they haven't released yet is that
>> CallWeaver hasn't yet been ported to all platforms they're targeting.
>>
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>>   http://lists.digium.com/mailman/listinfo/asterisk-users
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>
> !DSPAM:4835181c65721445615627!
>
> --
>
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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[David Backeberg]

On Fri, Jun 26, 2009 at 11:10 AM, James Lamanna wrote:
> Hi,
> I remember seeing a T38 Gateway application for Asterisk 1.6 floating
> around, but I can't seem to find it again.
> Does anyone have any pointers to it? I really want to be able to send
> an incoming T38 connection directly to the PSTN.

I've seen a number of similar requests. Can somebody explain the
use-case to me?

So you've got some kindof phone media gateway running asterisk, that
terminates PSTN.
And you've got something inside the media gateway pushing T38. What's
generating the T38?
Why wouldn't you just SendFax() on your phone media gateway asterisk
system straight onto the PSTN?

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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[James Lamanna]

> On Fri, Jun 26, 2009 at 11:10 AM, James Lamanna wrote:
>> Hi,
>> I remember seeing a T38 Gateway application for Asterisk 1.6 floating
>> around, but I can't seem to find it again.
>> Does anyone have any pointers to it? I really want to be able to send
>> an incoming T38 connection directly to the PSTN.
>
>I've seen a number of similar requests. Can somebody explain the
>use-case to me?

The use case is that a customer has a fax machine attached to an ATA.
The ATA sends T38 to Asterisk over SIP, then I need to forward that out
the PSTN.

-- James

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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[David Backeberg]

On Fri, Jun 26, 2009 at 1:31 PM, James Lamanna wrote:
> The use case is that a customer has a fax machine attached to an ATA.
> The ATA sends T38 to Asterisk over SIP, then I need to forward that out
> the PSTN.

Got it. I'm saying why not skip the ATA and asterisk, and plug the fax
into the PSTN?

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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[Tim Nelson]

- "David Backeberg"  wrote:
> On Fri, Jun 26, 2009 at 1:31 PM, James Lamanna
> wrote:
> > The use case is that a customer has a fax machine attached to an
> ATA.
> > The ATA sends T38 to Asterisk over SIP, then I need to forward that
> out
> > the PSTN.
> 
> Got it. I'm saying why not skip the ATA and asterisk, and plug the
> fax
> into the PSTN?
> 

...

Maybe... just MAYBE... the ATA/Fax will be nowhere near the physical proximity 
of the PSTN connection? What if the ATA/Fax is going to be at someone's remote 
cabin that only has internet connectivity and the Asterisk/PSTN is at their 
office or home?

--Tim

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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[Jonathan Thurman]

On Jun 26, 2009, at 10:44 AM, Tim Nelson  wrote:

> - "David Backeberg"  wrote:
>> On Fri, Jun 26, 2009 at 1:31 PM, James Lamanna
>> wrote:
>>> The use case is that a customer has a fax machine attached to an
>> ATA.
>>> The ATA sends T38 to Asterisk over SIP, then I need to forward that
>> out
>>> the PSTN.
>>
>> Got it. I'm saying why not skip the ATA and asterisk, and plug the
>> fax
>> into the PSTN?
>>
>
> ...
>
> Maybe... just MAYBE... the ATA/Fax will be nowhere near the physical  
> proximity of the PSTN connection? What if the ATA/Fax is going to be  
> at someone's remote cabin that only has internet connectivity and  
> the Asterisk/PSTN is at their office or home?
>
> --Tim
>

Or toll bypass, routing to other internal faxes, you want to assign  
the fax a number out of your DID block...  If you are not a small  
office, there are a lot of reasons to not have a dedicated fax PSTN  
line.

-Jonathan


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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[David Backeberg]

On Fri, Jun 26, 2009 at 11:10 AM, James Lamanna wrote:
> Hi,
> I remember seeing a T38 Gateway application for Asterisk 1.6 floating
> around, but I can't seem to find it again.
> Does anyone have any pointers to it? I really want to be able to send
> an incoming T38 connection directly to the PSTN.

There's always store and forward, also known as email, but with far
less resolution.

ReceiveFax(), set the file to a directory that you scan for outgoing fax, then
SendFax().

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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[James Lamanna]

>On Fri, Jun 26, 2009 at 1:31 PM, James Lamanna wrote:
>> The use case is that a customer has a fax machine attached to an ATA.
>> The ATA sends T38 to Asterisk over SIP, then I need to forward that out
>> the PSTN.

> Got it. I'm saying why not skip the ATA and asterisk, and plug the fax
> into the PSTN?

When you run a hosted service where a customer is connected to your remote
datacenter over dedicated voice/data T1s, they are a little far from
the PSTN connection :)

-- James

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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[James Lamanna]

>On Fri, Jun 26, 2009 at 11:10 AM, James Lamanna wrote:
> Hi,
> I remember seeing a T38 Gateway application for Asterisk 1.6 floating
> around, but I can't seem to find it again.
> Does anyone have any pointers to it? I really want to be able to send
> an incoming T38 connection directly to the PSTN.
>
>There's always store and forward, also known as email, but with far
> less resolution.
>
> ReceiveFax(), set the file to a directory that you scan for outgoing fax, then
> SendFax().

That would require putting a * box at the customer's premises, which we do not
do (see hosted model from earlier). I'm trying to avoid sending T.30 at all,
even over dedicated links.

-- James

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Re: [asterisk-users] T38 Fax Gateway for Asterisk 1.6

[Leif Madsen]

James Lamanna wrote:
> I remember seeing a T38 Gateway application for Asterisk 1.6 floating
> around, but I can't seem to find it again.
> Does anyone have any pointers to it? I really want to be able to send
> an incoming T38 connection directly to the PSTN.

You might be looking for this issue in the bug tracker:

https://issues.asterisk.org/view.php?id=13405

Leif Madsen.
http://www.leifmadsen.com
http://www.oreilly.com/catalog/asterisk

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[Asterisk-Users] T38 fax pass thru to Cisco as53xx

[Raymond Chen]

Dear all,

 

 

Did anyone successfully test T38 fax pass thru to Cisco
as53xx?  We’ve tried 1.2.4 with latest patch and latest svn trunk
and T38 patch but still not work.  Reinvites from Cisco are correctly passed
back to the originating gateway, but fax never able to connect.

 

Cisco IOS 12.3.x configuration

 

voice service voip
 fax protocol t38 ls-redundancy 5 hs-redundancy 2 fallback pass-through
g711alaw
 h323
 sip

 

Thanks

 

Ray






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Re: [asterisk-users] T38 Fax with Grandstream HT-502

[Kevin P. Fleming]

On 08/01/2011 12:02 PM, Robert Huddleston wrote:

Anyone have any testing experience with T38 and HT-502 Grandstream?

I just want to confirm that t.38 is working on this device.


You'd be more likely to get relevant responses if you had included the 
information about the HT-502 in your message subject :-)


--
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445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org

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Re: [asterisk-users] T38 Fax with Grandstream HT-502

[Robert Huddleston]

My apologies - yes.. Grandstream HT-502...

Apparently finding a t.38 provider is also another struggle...

-Original Message-
From: asterisk-users-boun...@lists.digium.com
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Kevin P.
Fleming
Sent: Monday, August 01, 2011 1:05 PM
To: asterisk-users@lists.digium.com
Subject: Re: [asterisk-users] T38 Fax with Grandstream HT-502

On 08/01/2011 12:02 PM, Robert Huddleston wrote:
> Anyone have any testing experience with T38 and HT-502 Grandstream?
>
> I just want to confirm that t.38 is working on this device.

You'd be more likely to get relevant responses if you had included the 
information about the HT-502 in your message subject :-)

-- 
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Digium, Inc. | Director of Software Technologies
Jabber: kflem...@digium.com | SIP: kpflem...@digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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[asterisk-users] T38 fax printer Windows client for asterisk 1.8

[Alec Davis]

Involves asterisk, so not too far off topic.

Being New Zealand based we need alaw support.

I've tried a few T38 clients which either don't support alaw (FaxBack free
edition), and finished up with asterisk transcoding and the fax never gets
sent.
Or another client (FaxVoip) that gets a fax through but always has some
lines missing.
The issues above could be asterisk's problem (1.8 SVN branch) or the
client's.

What I'm obviously seeking is a known good working free Windows XP - Windows
7 Fax add-in for Microsoft Fax and Scanning.

Alec Davis

  


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