[asterisk-bugs] [JIRA] (ASTERISK-26432) hangup during long TDD sendtext not detected, blocking channel

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-26432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=232482#comment-232482 ] 

Asterisk Team commented on ASTERISK-26432:
------------------------------------------

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].

> hangup during long TDD sendtext not detected, blocking channel
> --------------------------------------------------------------
>
>                 Key: ASTERISK-26432
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26432
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_dahdi
>    Affects Versions: 13.11.1
>         Environment: CentOS 6.5
> libpri 1.5.0
> Dahdi 2.11.1
> Asterisk 13.11.2
> wanpipe 7.0.19
> 8 DMS100 PRIs on Sangoma A108DE cards
>            Reporter: Nicolas Chapleau
>
> answer()
> setTDD(on)
> sendText("Put a long message to play back on the customers TTY device)
> When a hangup occurs during the sendtext, I can see the PRI_EVENT_HANGUP_REQ on my PRI span but it is not processed until the sendtext command completes. I have debugged the sendtext command and I see it complete tdd_generate then loop (chan_dahdi.c line 13435) to write the tones while checking for hangup (line 13436), which is NOT detected. 
> Meanwhile, new calls coming into that span get rejected until the sendtext completes, after which I get PRI MDL (f) errors. On busy systems, it will also cause Exceptionally long frame queuing error messages.
> I can easily recreate this by hanging up during the sendtext command and calling back right away. 
> This issue has blocked us from upgrading from 1.4.43 where it does not happen. For now I put a temporary fix in our script to send TDD text one letter at a time which helps but not having sendtext block the span on hangup.



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