[Freeswitch-users] t.38 Call Flow Information

[Anthony Minessale]

you can tweak mod_spandsp_fax.c:1391

req_counter is how many packets to wait before sending re-invite.

You can play with reducing this number and if its effective it could be
made into a configurable param.



On Fri, Dec 21, 2012 at 10:42 AM, Spencer Thomason <
spencer at 5ninesolutions.com> wrote:

> Hi Steve,
> That was my take as well.   I've posted packet captures and logs here:
> http://jira.freeswitch.org/browse/FS-4957
>
> Is there any way to speed up the ReINVITE?
>
> Thanks,
> Spencer
>
>
> -----Original message-----
>
> *From: *Steve Underwood <steveu at coppice.org>*
> To: *freeswitch-users at lists.freeswitch.org*
> Sent: *Fri, Dec 21, 2012 09:57:07 GMT+00:00*
> Subject: *Re: [Freeswitch-users] t.38 Call Flow Information
>
> Hi,
>
> It looks like your reinvite occurred extremely late, and the FAX was
> already deep in progress as an audio exchange.
>
> Steve
>
>
> On 12/21/2012 03:14 AM, Spencer Thomason wrote:
> > Hello,
> > I've been analyzing some Wireshark traces to get a better grasp on the
> t.38 gateway process. I'm using t38_gateway to convert SIP t38 to TDM audio
> on the receiving end. I'm struggling to understand the following call flow.
> I've excluded the audio portion for brevity but t38 is negotiated correctly
> by both endpoints (FS on our end and Acme on the other). Note the absence
> of a DIS message and the PPS prior to CFR. Can anyone shed any light on
> this?
> >
> > Thanks in advance,
> > Spencer
> >
> >
> > Acme FreeSWITCH
> > |1716.691635| INVITE SDP (t38) | |SIP Request
> > | |(5060) <------------------ (5070) | |
> > |1716.719556| 100 trying -- your call is important to us | |SIP Status
> > | |(5060) ------------------> (5070) | |
> > |1716.830431| | no-signal | |t38:t30 Ind:no-signal
> > | | |(21440) <------------------ (15876) |
> > |1716.906132| 200 OK SDP (t38) | |SIP Status
> > | |(5060) ------------------> (5070) | |
> > |1716.912839| ACK | | |SIP Request
> > | |(5060) <------------------ (5070) | |
> > |1716.973011| | no-signal | |t38:t30 Ind:no-signal
> > | | |(21440) ------------------> (15876) |
> > |1717.450595| | v21-preamble |t38:t30 Ind:v21-preamble
> > | | |(21440) <------------------ (15876) |
> > |1717.730869| | PPS | |t38:v21:HDLC:Partial Page Signal
> > | | |(21440) <------------------ (15876) |
> > |1717.780811| | no-signal | |t38:t30 Ind:no-signal
> > | | |(21440) <------------------ (15876) |
> > |1718.130798| | v17-14400-long-training |t38:t30
> Ind:v17-14400-long-training
> > | | |(21440) <------------------ (15876) |
> > |1719.541095| | t4-non-ecm-data:v17-14400 |t38:t4-non-ecm-data:v17-14400
> Duration: 1.51s No packet lost
> > | | |(21440) <------------------ (15876) |
> > |1721.060850| | no-signal | |t38:t30 Ind:no-signal
> > | | |(21440) <------------------ (15876) |
> > |1722.573572| | v21-preamble |t38:t30 Ind:v21-preamble
> > | | |(21440) ------------------> (15876) |
> > |1723.593652| | CFR | |t38:v21:HDLC:Confirmation To Receive
> > _________________________________________________________________________
> > Professional FreeSWITCH Consulting Services:
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> > http://www.freeswitchsolutions.com
> >
> > 
> > 
> >
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> >
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>
>
> _________________________________________________________________________
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> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
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> http://wiki.freeswitch.org
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>
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>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
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>
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>


-- 
Anthony Minessale II

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