[asterisk-bugs] [JIRA] (ASTERISK-27082) Fax error when receive a CSI has a wrong character encoding

[Ludovic Gasc (Eyepea) (JIRA)]

Ludovic Gasc (Eyepea) created ASTERISK-27082:
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             Summary: Fax error when receive a CSI has a wrong character encoding
                 Key: ASTERISK-27082
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27082
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_fax_spandsp
    Affects Versions: 13.16.0
         Environment: Debian 8
            Reporter: Ludovic Gasc (Eyepea)
            Severity: Minor


Hi,

When we use SendFAX application, we have found a fax machine that stops prematurely Fax session.
It seems a character encoding issue:

The logs:

[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.38 Rx    82: (0) data v21/hdlc-fcs-OK-sig-end + 0 byte(s)
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.38T Type CSI - CRC OK, sig end (clean)
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Stop T4 (13840 remaining)
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Rx:  CSI without final frame tag
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Rx:  ff 03 40 36 32 ff 13 84
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Remote gave CSI as: "��26" 
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 HDLC signal status is Carrier down (-1) in state 6
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 HDLC signal status is Carrier down (-1) in state 6
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 No signal is present
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.38 Rx    83: IFP 00
[Jun 22 09:52:07] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.38 Rx    83: indicator no-signal
[Jun 22 09:52:33] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Status changing to 'The call dropped prematurely'
[Jun 22 09:52:33] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Changing from state 6 to 30
[Jun 22 09:52:33] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Changing from phase T30_PHASE_B_RX to T30_PHASE_CALL_FINISHED
[Jun 22 09:52:33] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.38T Set rx type 9
[Jun 22 09:52:33] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.38T Set tx type 9
[Jun 22 09:52:33] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.38T FAX exchange complete
[Jun 22 09:52:33] FAX[24642][C-00000007]: res_fax.c:1039 ast_fax_log: FLOW T.30 Call completed
[Jun 22 09:52:33] ERROR[24642][C-00000007]: json.c:825 ast_json_vpack: Error building JSON from '{s: s, s: s}': Invalid UTF-8 string.
[Jun 22 09:52:33] ERROR[24642][C-00000007]: stasis_channels.c:771 ast_channel_publish_varset: Error creating message
[Jun 22 09:52:33] ERROR[24642][C-00000007]: json.c:825 ast_json_vpack: Error building JSON from '{s: s, s: s, s: s, s: s, s: s, s: s, s: o}': Invalid UTF-8 string.
[Jun 22 09:52:33] ERROR[24642][C-00000007]: res_fax.c:2808 sendfax_exec: Error publishing SendFAX status message

We have the PCAP, but we can't share publicly on the Internet.

The strange thing, is that we don't seem to have this issue with another server with Asterisk 13.15. But, for an unknown reason, it doesn't use T.38 for the same number: 

[Jun 22 12:40:56] FAX[7619][C-00000037]: res_fax.c:1039 ast_fax_log: FLOW T.30 The remote was made in 'Japan'
[Jun 22 12:40:56] FAX[7619][C-00000037]: res_fax.c:1039 ast_fax_log: FLOW T.30 The remote was made by 'Brother'
[Jun 22 12:40:56] FAX[7619][C-00000037]: res_fax.c:1039 ast_fax_log: FLOW T.30 Stop none (0 remaining)
[Jun 22 12:40:56] FAX[7619][C-00000037]: res_fax.c:1039 ast_fax_log: FLOW T.30 Rx:  CSI without final frame tag
[Jun 22 12:40:56] FAX[7619][C-00000037]: res_fax.c:1039 ast_fax_log: FLOW T.30 Rx:  ff 03 40 36 32 30 39 35 35 33 32 32 33 2b 20 20 20 20 20 20 20 20 20
[Jun 22 12:40:56] FAX[7619][C-00000037]: res_fax.c:1039 ast_fax_log: FLOW T.30 Remote gave CSI as: "+3223559026" 



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