[asterisk-bugs] [JIRA] (ASTERISK-21130) sip_pvt.dsp incorrect manipulation related to inband dtmfmode and faxdetect in SIPDtmfMode() app. and enable_dsp_detect()

[Richard Mudgett (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-21130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=203258#comment-203258 ] 

Richard Mudgett commented on ASTERISK-21130:
--------------------------------------------

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> sip_pvt.dsp incorrect manipulation related to inband dtmfmode and faxdetect in SIPDtmfMode() app. and enable_dsp_detect()
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-21130
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21130
>             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
>         Attachments: asterisk-1.8.20.0-dsp-fix.diff
>
>
> 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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