[Freeswitch-users] t.38 Call Flow Information

Sat Dec 22 01:34:25 MSK 2012

if you dont need actual detection you can skip it with nocng and jump right
into the processing,
You'll have to eyeball it but it should detect it right away, take note of
it by watching the logs.

On Fri, Dec 21, 2012 at 4:22 PM, Spencer Thomason <
spencer at 5ninesolutions.com> wrote:

> I tried tweaking this and it didn't seem to have any effect.  I'm calling
> t38_gateway like this:
> <action application="set" data="execute_on_answer=t38_gateway self"/>
> before the bridge.
>
> Is there anything I should be doing to speed up the detection?  I should
> note that is on the receiving end.
>
> The re-invite from rxfax worked without a hitch.  Would this suggest the
> default req_counter value is ok?
>
>
> On Dec 21, 2012, at 9:12 AM, Anthony Minessale wrote:
>
> 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
>> >
>> _________________________________________________________________________
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>> >
>> > 
>> > 
>> >
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>>
>>
>> _________________________________________________________________________
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>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>>
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>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
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>>
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>>
>
>
> --
> Anthony Minessale II
>
> FreeSWITCH http://www.freeswitch.org/
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>
> AIM: anthm
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>
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> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
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>
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
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>

-- 
Anthony Minessale II

FreeSWITCH http://www.freeswitch.org/
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AIM: anthm
MSN:anthony_minessale at hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
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