[asterisk-bugs] [JIRA] (ASTERISK-21138) sip_pvt.dsp incorrect manipulation related to inband dtmfmode and faxdetect in SIPDtmfMode() app. and enable_dsp_detect()

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-21138:
---------------------------------------

             Summary: sip_pvt.dsp incorrect manipulation related to inband dtmfmode and faxdetect in SIPDtmfMode() app. and enable_dsp_detect()
                 Key: ASTERISK-21138
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21138
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 1.8.20.0
            Reporter: Roman S.
            Assignee: Roman S.
            Severity: Minor


1. If {{sip_pvt.dsp}} is already inited (e.g. with {{faxdetect=yes}}) then it can't be changed with {{SIPDtmfMode()}} app.

{noformat}
30013 static int sip_dtmfmode(struct ast_channel *chan, const char *data)

30055         if ((ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) ||
30056             (ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_AUTO)) {
30057                 enable_dsp_detect(p);

 4598 static void enable_dsp_detect(struct sip_pvt *p)

 4602         if (p->dsp) {
 4603                 return;
{noformat}

Example:

{noformat}
sip.conf:
 faxdetect = yes ; this enables dsp with DSP_FEATURE_FAX_DETECT flag
 dtmfmode = rfc2833 ; no DSP_FEATURE_DIGIT_DETECT flag for dsp

extensions.conf:
 ...,SIPDtmfMode(inband)
{noformat}

{{SIPDtmfMode()}} doesn't set {{DSP_FEATURE_DIGIT_DETECT}} flag for dsp in {{enable_dsp_detect()}}.

2. If {{SIPDtmfMode()}} app. disables inband mode (e.g. switch to rfc2833) it also disables faxdetect (indeed any dsp feature).

{noformat}
30013 static int sip_dtmfmode(struct ast_channel *chan, const char *data)

30055         if ((ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_INBAND) ||
30056             (ast_test_flag(&p->flags[0], SIP_DTMF) == SIP_DTMF_AUTO)) {
30057                 enable_dsp_detect(p);
30058         } else {
30059                 disable_dsp_detect(p);
30060         }
{noformat}

This check (line 30055) should also contain {{SIP_PAGE2_FAX_DETECT_CNG}} in condition and keep dsp also for faxdetect.

Example:

{noformat}
sip.conf:
 faxdetect = yes ; this enables dsp with DSP_FEATURE_FAX_DETECT flag
 dtmfmode = inband ; dsp with DSP_FEATURE_DIGIT_DETECT flag

extensions.conf:
 ...,SIPDtmfMode(rfc2833)
{noformat}

{{SIPDtmfMode()}} disables any dsp feature including faxdetect (which indeed should be kept).

Thanks

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