[Freeswitch-users] Faxing problems if B leg offers T.38

Anthony Minessale anthony.minessale at gmail.com
Thu Jun 2 21:57:33 MSD 2011 

start by proving them and post them in a jira with full console traces
with sofia global siptrace on and pcaps etc

then wait for us to get to them or email consulting at freeswitch.org for
expedition

On Wed, May 25, 2011 at 11:56 AM, Rob Morin <rmorin at blie-ent.com> wrote:
> Thank you.
>
>
>
> So, I believe that there are two potential problems, fixing either of which
> will allow me to send faxes.
>
>
>
> 1.       When T.38 is enabled in passthrough mode and the B leg offers T.38,
> Freeswitch needs to forward the invite and the responses. Currently it isn’t
> forwarding the response back to the B leg.
>
> 2.       When T.38 is not enabled and the B leg offers T.38, Freeswitch
> needs to respond with a 488 indicating T.38 is not acceptable.  Currently it
> doesn’t respond at all.
>
>
>
> How would I go about making or requesting these fixes?
>
> Thank you,
> Rob
>
>
>
> From: David Ponzone [mailto:david.ponzone at ipeva.fr]
> Sent: Wednesday, May 25, 2011 11:11 AM
>
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Faxing problems if B leg offers T.38
>
>
>
> Rob,
>
>
>
> On my test box, I run a GIT from 05-02, and I don't have any issue.
>
> But I just did the test, and the call flow is different from yours.
>
>
>
> When I send a fax with my endpoint (Zoiper Softphone), I got the remote fax
> tone, and then my Zoiper sends the T38-REINVITE, not the remote gateway.
>
> So I guess there are 2 possible call flows, because I remember in some
> circumstances, the remote sends the RE-INVITE.
>
>
>
> David Ponzone  Direction Technique
>
> email: david.ponzone at ipeva.fr
>
> tel:      01 74 03 18 97
>
> gsm:   06 66 98 76 34
>
>
>
> Service Client IPeva
>
> tel:      0811 46 26 26
>
> www.ipeva.fr  -   www.ipeva-studio.com
>
>
>
> Ce message et toutes les pièces jointes sont confidentiels et établis à
> l'intention exclusive de ses destinataires. Toute utilisation ou diffusion
> non autorisée est interdite. Tout message électronique est susceptible
> d'altération. IPeva décline toute responsabilité au titre de ce message s'il
> a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce
> message, merci de le détruire immédiatement et d'avertir l'expéditeur.
>
>
>
>
>
> Le 25/05/2011 à 13:18, Rob Morin a écrit :
>
> Is the fact that I was previously running the snapshot from 25 March
> adequate to meet this test?
>
>
>
> From: Rob Morin [mailto:rmorin at blie-ent.com]
> Sent: Tuesday, May 24, 2011 10:50 AM
> To: 'FreeSWITCH Users Help'
> Subject: Re: [Freeswitch-users] Faxing problems if B leg offers T.38
>
>
>
> I can, if someone can tell me where to get the snapshot.  I looked
> at files.freeswitch.org and didn’t see one.
>
>
>
> Prior to updating to the 5-17 snapshot, I was having the same problems with
> the 3-25 snapshot that I was using.
>
>
>
> Thank you,
>
> Rob
>
>
>
> From: David Ponzone [mailto:david.ponzone at ipeva.fr]
> Sent: Tuesday, May 24, 2011 1:47 AM
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Faxing problems if B leg offers T.38
>
>
>
> Rob,
>
>
>
> following Yehavi's comment, could you downgrade your GIT version to a
> previous version, like one month old ?
>
>
>
> David Ponzone  Direction Technique
>
> email: david.ponzone at ipeva.fr
>
> tel:      01 74 03 18 97
>
> gsm:   06 66 98 76 34
>
>
>
> Service Client IPeva
>
> tel:      0811 46 26 26
>
> www.ipeva.fr  -   www.ipeva-studio.com
>
>
>
> Ce message et toutes les pièces jointes sont confidentiels et établis à
> l'intention exclusive de ses destinataires. Toute utilisation ou diffusion
> non autorisée est interdite. Tout message électronique est susceptible
> d'altération. IPeva décline toute responsabilité au titre de ce message s'il
> a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce
> message, merci de le détruire immédiatement et d'avertir l'expéditeur.
>
>
>
>
>
>
>
> Le 24/05/2011 à 02:59, Rob Morin a écrit :
>
>
>
> David,
>
>
>
> It isn’t the ATA. I’ve tried both the Grandstream HandyTone 502 and
> Cisco/Linksys SPA 2102. Same story in both cases.
>
>
>
> I had my carrier help me troubleshoot and we can see the SIP request from
> the carrier come in. When T.38 is enabled, it is forwarded to the A leg, but
> the response from the A leg isn’t forwarded back to the B leg. I can produce
> traces that show this.
>
>
>
> When T.38 isn’t enabled, the B leg is sending a T.38 reinvite. FS doesn’t
> respond or forward it. So the connection dies.  I have every reason to
> believe that I’d be able to send the fax if FS would respond with a 488
> indicating T.38 is not acceptable. But instead, all I get is silence. Again,
> I can produce traces that demonstrate this.
>
>
>
> There’s another similar email  trail out
> there, http://freeswitch-users.2379917.n2.nabble.com/T-38-via-UPDATE-request-td3821994.html,
> but I’m not certain that they’re related.
>
>
>
> Thank you for your help!
> Rob
>
>
>
> From: David Ponzone [mailto:david.ponzone at ipeva.fr]
> Sent: Monday, May 23, 2011 6:11 PM
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Faxing problems if B leg offers T.38
>
>
>
> Rob,
>
>
>
> perhaps you should not consider T38 is 100% interoperable.
>
> You may tell us what ATA is that, because some of them are nice piece of
> junk.
>
>
>
> David Ponzone  Direction Technique
>
> email: david.ponzone at ipeva.fr
>
> tel:      01 74 03 18 97
>
> gsm:   06 66 98 76 34
>
>
>
> Service Client IPeva
>
> tel:      0811 46 26 26
>
> www.ipeva.fr  -   www.ipeva-studio.com
>
>
>
> Ce message et toutes les pièces jointes sont confidentiels et établis à
> l'intention exclusive de ses destinataires. Toute utilisation ou diffusion
> non autorisée est interdite. Tout message électronique est susceptible
> d'altération. IPeva décline toute responsabilité au titre de ce message s'il
> a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce
> message, merci de le détruire immédiatement et d'avertir l'expéditeur.
>
>
>
>
>
>
> Le 23/05/2011 à 20:51, Rob Morin a écrit :
>
>
> I’m having problems faxing if the B leg offers T.38.  Several scenarios, but
> always the same result.
>
>
>
> First, the architecture
>
>
>
> FAX à ATA (T.38 optional) à FS à Carrier  à Destination (Possibly another
> carrier (PSTN) and the fax machine)
>
>
>
> On my ATA, T.38 is enabled (Auto Detect).
>
>
>
> If the destination supports T.38, the Carrier will offer it to Freeswitch.
> If the Destination doesn’t support T.38, the B leg doesn’t offer it and the
> faxes go through.
>
>
>
> I’ve set Freeswitch as:
>
>       <action application="set" data="fax_enable_t38=true"/>
>
>       <action application="export" data="t38_passthru=true"/>
>
> When that’s the case, and the B leg offers T.38, Freeswitch passes through
> the offer and the ATA responds, 3 times. But the response never gets sent to
> the B leg, so it terminates the call after about 30 seconds.
>
>
>
> When I set Freeswitch as:
>
>       <action application="set" data="fax_enable_t38=false"/>
>
> The B leg still offers T.38 if its other side is capable. Freeswitch doesn’t
> pass the offer through and the B leg terminates the call after about 30
> seconds.
>
>
>
> I’m running on a recent git ( FreeSWITCH Version 1.0.head (git-86d757d
> 2011-05-17 22-51-47 -0500) ).
>
>
>
> I’ve had no success attempting to configure FS as a gateway. Frankly, T.38
> “passthrough” has had the most success, mostly when the other ends aren’t
> T.38 capable and it stays in G711u.
>
>
>
> Is there something else I need to do to enable T.38 in passthrough mode?
>
>
>
> Thank you,
> Rob Morin
>
>
>
> PS – I can provide tcpdumps of this, or whatever else is necessary.
>
>
>
>
>
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-- 
Anthony Minessale II

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