[asterisk-bugs] [JIRA] (ASTERISK-25034) chan_dahdi: Some telco switches occasionally ignore ISDN RESTART requests.

[Richard Mudgett (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=226059#comment-226059 ] 

Richard Mudgett commented on ASTERISK-25034:
--------------------------------------------

Patches up on gerrit:
v11 https://gerrit.asterisk.org/#/c/303/
v13 https://gerrit.asterisk.org/#/c/304/
master https://gerrit.asterisk.org/#/c/305/

> chan_dahdi: Some telco switches occasionally ignore ISDN RESTART requests.
> --------------------------------------------------------------------------
>
>                 Key: ASTERISK-25034
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25034
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_dahdi
>    Affects Versions: 11.17.1, 13.3.2
>            Reporter: Richard Mudgett
>            Assignee: Richard Mudgett
>
> The fix for ASTERISK-19608 added an escape clause for B channels in the restarting state if the telco ignores a RESTART request.  If the telco fails to acknowledge the RESTART then Asterisk will assume the telco acknowledged the RESTART on the second call attempt requesting the B channel by the telco.  The escape clause is good for dealing with RESTART requests in general but it does cause the next call for the restarting B channel to be rejected if the telco insists the call must go on that B channel.
> chan_dahdi doesn't really need to issue a RESTART request in response to receiving a cause 44 (Requested channel not available).  Sending the RESTART in such a situation is not required (nor prohibited) by the standards.  I think chan_dahdi does this for historical reasons to deal with buggy peers to get channels unstuck in a similar fashion as the chan_dahdi.conf resetinterval option.
> This issue proposes to add a chan_dahdi.conf force_restart_unavailable_chans compatability option that when disabled will prevent chan_dahdi from trying to RESTART the channel in response to a cause 44 code.



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