[Freeswitch-users] inbound T.38 re-invite transaction stalls

[Daniel Greenwald]

Is PCMU media flowing before the REINVITE?

On Fri, Aug 6, 2021 at 5:10 PM Jeff Pyle <jeff at ugnd.org> wrote:

> Hello,
>
> This is on 1.10.6-release-18-1ff9d0a60e~64bit, the latest release version
> from the repo.
>
> I run the following API command to send a TIFF file with txfax:
>
> originate
> {sip_h_P-CustomHeader=value,ignore_early_media=true,fax_ident='Fax
> Test',origination_caller_id_name='Fax
> Test',origination_caller_id_number=2165551111,absolute_codec_string=PCMU at 20i
> ,fax_verbose=true,fax_enable_t38=yes,fax_enable_t38_request=yes,fax_use_ecm=no,fax_end_page=1,jitterbuffer_msec=200:200:200}sofia/external/
> 4045551111 at 1.2.3.4:5060 &txfax(/usr/local/etc/faxtiffs/smiley-fine.tif)
>
> The INVITE goes out as expected, and the call connects normally.  One
> second later, the far side sends a re-invite for T.38.  Local FreeSWITCH
> shows the remote SDP on the console, sends a 100 Trying, and this appears
> on the console:
>
> [DEBUG] switch_core_media.c:5192 sofia/external/4045551111 at 1.2.3.4:5060
> T38 ACCEPT on request
> [DEBUG] switch_core_media.c:5296 sofia/external/4045551111 at 1.2.3.4:5060
> T38 IS POSSIBLE on request
>
> And then nothing.  No 200 OK, 488 Not Acceptable Here, nothing past the
> 100 Trying.  I can't tell why.
>
> spandsp.conf.xml is vanilla with only ident, header and spool-dir updated.
>
> The environment is relatively simple with all static public IPs, no NAT,
> etc.  This particular FS instance serves only as an endpoint for testing
> like this fax example.
>
> This configuration has been working in general for years and specifically
> on this box for almost a year.  Apparently something has changed somewhere
> but I can't see what.  I'm hoping someone might be able to point me in a
> direction to diagnose and solve this.
>
>
> Regards,
> Jeff
>
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