[Freeswitch-users] T38 unsuccessful: result (48) Disconnected after permitted retries

Tue Jun 15 08:41:38 PDT 2010

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>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> 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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>>
>>
>
>
> --
> Anthony Minessale II
>
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