[Freeswitch-users] t38_gateway self - no re-Invite?

Sat Feb 26 02:54:39 MSK 2011

Yes, tried that too - no luck - both, self and peer

When I try to send the fax to an extension with rxfax, all is working fine.

Zoiper invites pcma -> 
freeswitch OK -> 
Zoiper reinvites t38 -> 
freeswitch TRYING -> 
fresswitch executes rxfax - mod_spandsp_fax.c "reads" the t38 sdp->
freeswitch sends OK with t38 sdp ->

any other ideas?

> I dont know what your topology is but did you also try setting the app
> on the A leg and try both peer and self
> 
> <action application="t38_gateway" data="self"/>
> 
> right before bridge.
> 
> 
> On Fri, Feb 25, 2011 at 4:36 PM, Clemens Ebentheuer <ce at kapper.net>
> wrote:
> > Hi
> >
> > My way:
> >
> > internal:t38(zoiper) -> FS -> external:g711 (provider with no t38
> support)
> >
> > I tried all versions of set and export and peer and self - but no
> luck- for my understanding it should work with set t38_gateway self
> >
> > Set because of aleg and self because FS acts as the T38 fax
> "receiver".
> >
> > Am I wrong here?
> >
> > My dialplan:
> > <extension name="0-sil-p000016" >
> >   <condition field="destination_number" expression="^0(.*)$">
> >       <action application="set" data="fax_enable_t38=true"/>
> >       <action application="set" data="execute_on_answer=t38_gateway
> self"/>
> >       <action application="bridge" data="sofia/gateway/sil-
> p000016/$1"/>
> >   </condition>
> > </extension>
> > (testet with and without fax_enable_t38_request=true)
> >
> > Thx,
> >
> >
> > Clemens
> >
> >
> >
> >
> >> have you tried the self vs peer args to the t38 gateway app, maybe
> you
> >> have it configured backwards.
> >>
> >>
> >> On Fri, Feb 25, 2011 at 4:11 PM, Clemens Ebentheuer <ce at kapper.net>
> >> wrote:
> >> > Hi,
> >> >
> >> >> It can be, that in your case the device is simply detecting the
> FAX
> >> >> tones itself before FS does. When the device sends a ReINVITE to
> FS
> >> FS
> >> >> has no chance to detect CNG anymore and hence never switch to
> t38.
> >> >
> >> > Maybe you´re right here - or zoiper
> >> (http://www.zoiper.com/softphone/classic/ which is a softphone with
> >> only t38 fax support [no g711 fallback]) sends the reinvite every
> time
> >> after answer when it is sending a fax.
> >> >
> >> >>
> >> >> Just trace the sending FAX-Device for SIP-Signalling and you
> should
> >> se
> >> >> a
> >> >> ReINVITE from FAX-device to FS, if this is true.
> >> >
> >> > Here is a debug with siptrace:
> http://pastebin.freeswitch.org/15439
> >> >
> >> > If I read the logs in a right way:
> >> > then FS executes t38_gateway on answer -
> >> > sends a 200 OK to zoiper -
> >> > zoiper answers with ACK and then reinvites with t38 -
> >> > FS answers 100 Trying-
> >> >
> >> > And nothing is happening. I´m not sure if this is the scenario you
> >> describe below, but shouldn´t FS answer with a t38 sdp so zoiper
> knows
> >> where to send it´s t38 fax??
> >> >
> >> >>
> >> >> You should check your t38-Device configuration. See if it is able
> to
> >> >> let
> >> >> the t38 fax detection job only by FS.
> >> >>
> >> >> Establish a call from the Fax device to a phone. Can your hear
> the
> >> CNG
> >> >> signal when you pickup the phone? Does it suddenly stop? If so,
> the
> >> FAX
> >> >> device or FS/mod_spandsp has sent a t38-ReINVITE.
> >> >>
> >> >> Do you see something like "media Bug removed" in FS console
> (DEBUG
> >> >> level) after 20 seconds of listening to 1100Hz? If so, then FS
> >> failed
> >> >> to
> >> >> detect CNG, hence it never received it (or for too short to
> detect
> >> it).
> >> >>
> >> >> On my Grandstream ATAs this wasn't possible, so I had to search
> for
> >> a
> >> >> hack.
> >> >>
> >> >> Hope this will light up your problems a little bit.
> >> >>
> >> >>
> >> >> > If so, I´m wondering why rxfax in t38 mode is working fine then
> -
> >> >> with re-invite.
> >> >> Can't tell you with this, never tried that. sorry.
> >> >
> >> > Thx,
> >> >
> >> > clemens
> >> >
> >> > _______________________________________________
> >> > FreeSWITCH-users mailing list
> >> > FreeSWITCH-users at lists.freeswitch.org
> >> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> >> >
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> >> > http://www.freeswitch.org
> >> >
> >>
> >>
> >>
> >> --
> >> Anthony Minessale II
> >>
> >> FreeSWITCH http://www.freeswitch.org/
> >> ClueCon http://www.cluecon.com/
> >> Twitter: http://twitter.com/FreeSWITCH_wire
> >>
> >> AIM: anthm
> >> MSN:anthony_minessale at hotmail.com
> >> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
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> >>
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> >> pstn:+19193869900
> >>
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> 
> 
> 
> --
> Anthony Minessale II
> 
> FreeSWITCH http://www.freeswitch.org/
> ClueCon http://www.cluecon.com/
> Twitter: http://twitter.com/FreeSWITCH_wire
> 
> AIM: anthm
> MSN:anthony_minessale at hotmail.com
> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
> IRC: irc.freenode.net #freeswitch
> 
> FreeSWITCH Developer Conference
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> googletalk:conf+888 at conference.freeswitch.org
> pstn:+19193869900
> 
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