[asterisk-bugs] [JIRA] (ASTERISK-26500) DTMF RFC2833 with timestamp 0 are ignored

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-26500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=232849#comment-232849 ] 

Asterisk Team commented on ASTERISK-26500:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> DTMF RFC2833 with timestamp 0 are ignored
> -----------------------------------------
>
>                 Key: ASTERISK-26500
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26500
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_rtp_asterisk
>    Affects Versions: 1.8.32.3, 14.0.2
>            Reporter: Thomas Sevestre
>
> In function process_dtmf_rfc2833, the "Dropping out of order DTMF frame" test drops all DTMF with timestamp 0. Some equipments always send the first DTMF with timestamp 0. This leads to drop the first DTMF of each call.
> I've fixed the problem by changing this :
> if ((rtp->last_seqno > seqno && rtp->last_seqno - seqno < 50)
> 	|| timestamp <= rtp->last_end_timestamp) {
> into this:
> if ((rtp->last_seqno > seqno && rtp->last_seqno - seqno < 50)
> 	|| (timestamp != 0 && timestamp <= rtp->last_end_timestamp)) {



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