[Freeswitch-users] t.38 Call Flow Information

[Spencer Thomason]

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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