[Freeswitch-users] T38 unsuccessful: result (48) Disconnected after permitted retries
samuel
samu60 at gmail.com
Wed Jun 16 04:44:26 PDT 2010
I'm trying yo know what the remote end point brand/model/firmware/??? is but
I could not get this information yet.
The other point says that after the T.38 SDP negotiation, there must be a
"negotiation" (after the ACK of the T38 renegotiation there must be an
exchange of Send preamble; DIS (and later DCS) that never happens...) and
freeswitch does not start it and that is why the transmission results in a
call drop after 25 seconds.
Thank you very much for your answers so far,
Samuel
On 15 June 2010 19:17, Steve Underwood <steveu at coppice.org> wrote:
> Hi,
>
> That png looks like an RTP packet being interpreted as if it were UDPTL.
> This is quite normal during switchover, as the two ends never switch at
> the same moment. If you see nothing arriving after those three packets,
> it looks like no T.38 packets arrive at all.
>
> Steve
>
>
> On 06/15/2010 11:41 PM, samuel wrote:
> > I got a pcap file and after the T.38 renegotiation, wireshark reports
> > T.38 Malformed packet from the "originator" A.B.C.D. It sends 3 of
> > these packets and then stops. From freeswitch I just see "Unknown RTP
> > version 0" packets going to A.B.C.D
> >
> > I attach a png containing the wireshark malformed packet
> > "capture"..apologies in advanced but it's a few Kb and it's the
> > fastest way not to replace all "sensitive" information (IPs,
> > hostnames,etc...). Hope it passes the list filter..
> >
> >
> > On 15 June 2010 17:12, Anthony Minessale <anthony.minessale at gmail.com
> > <mailto:anthony.minessale at gmail.com>> wrote:
> >
> > did you watch it in a pcap?
> > Maybe it's one way audio.
> >
> >
> >
> > On Tue, Jun 15, 2010 at 7:03 AM, samuel <samu60 at gmail.com
> > <mailto:samu60 at gmail.com>> wrote:
> >
> > hi all,
> >
> > recently testing T.38 unsuccesfully with freeswitch head
> > version (FreeSWITCH Version 1.0.head (git-) ) on a testing
> > server (2.6.26-2-xen-amd64)
> >
> > remote SDP:
> >
> > v=0
> > o=root 6039 6040 IN IP4 A.B.C.D
> > s=session
> > c=IN IP4 A.B.C.D
> > t=0 0
> > m=image 19423 udptl t38
> > a=T38FaxVersion:0
> > a=T38MaxBitRate:9600
> > a=T38FaxFillBitRemoval:0
> > a=T38FaxTranscodingMMR:0
> > a=T38FaxTranscodingJBIG:0
> > a=T38FaxRateManagement:transferredTCF
> > a=T38FaxMaxBuffer:72
> > a=T38FaxMaxDatagram:72
> > a=T38FaxUdpEC:t38UDPRedundancy
> >
> > freeswitch answer:
> > v=0
> > o=FreeSWITCH 1276579579 1276579581 IN IP4 W.X.Y.Z
> > s=FreeSWITCH
> > c=IN IP4 W.X.Y.Z
> > t=0 0
> > m=image 22230 udptl t38
> > a=T38FaxVersion:0
> > a=T38MaxBitRate:14400
> > a=T38FaxFillBitRemoval
> > a=T38FaxRateManagement:transferredTCF
> > a=T38FaxMaxBuffer:2000
> > a=T38FaxMaxDatagram:400
> > a=T38FaxUdpEC:t38UDPRedundancy
> > a=T38VendorInfo:0 0 0
> >
> >
> > some debug:
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 T4 expired in phase T30_PHASE_B_RX, state 17
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Too many retries. Giving up.
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Changing from phase T30_PHASE_B_RX to T30_PHASE_D_TX
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.38T Set rx type 0
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.38T Set tx type 4
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Changing from state 17 to 3
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Tx: DCN with final frame tag
> > 2010-06-15 13:37:13.234961 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Tx: ff 13 fa
> > 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Send complete in phase T30_PHASE_D_TX, state 3
> > 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Send complete in phase T30_PHASE_D_TX, state 3
> > 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Disconnecting
> > 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Changing from phase T30_PHASE_D_TX to T30_PHASE_E
> > 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.38T Set rx type 0
> > 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.38T Set tx type 1
> > 2010-06-15 13:37:14.406960 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Changing from state 3 to 2
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:271 FLOW
> > T.30 Send complete in phase T30_PHASE_E, state 2
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:301
> >
> ==============================================================================
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:313 Fax
> > processing not successful - result (48) Disconnected after
> > permitted retries.
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:318
> > Remote station id:
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:319 Local
> > station id: SpanDSP Fax Ident
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:320 Pages
> > transferred: 0
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:322 Total
> > fax pages: 0
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:323 Image
> > resolution: 0x0
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:324
> > Transfer Rate: 14400
> > 2010-06-15 13:37:15.634931 [DEBUG] mod_spandsp_fax.c:326 ECM
> > status off
> >
> > I've starting learning about T3X and freswitch so I would like
> > whether someone can point me to any doc or any configuration
> > parameter that can solve the issue or at least debug it.
> >
> > Thanks in advance,
> >
> > Samuel
> >
>
>
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