[asterisk-bugs] [JIRA] (ASTERISK-22756) [patch]Correct cause code for chan_dahdi request when trunk congested

[Rusty Newton (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-22756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rusty Newton updated ASTERISK-22756:
------------------------------------

    Status: Open  (was: Triage)
    
> [patch]Correct cause code for chan_dahdi request when trunk congested
> ---------------------------------------------------------------------
>
>                 Key: ASTERISK-22756
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22756
>             Project: Asterisk
>          Issue Type: Improvement
>      Security Level: None
>          Components: Channels/chan_dahdi
>    Affects Versions: 1.8.24.0, 12.0.0-beta1
>         Environment: Any
>            Reporter: Michael Walton
>            Severity: Minor
>         Attachments: chan_dahdi.c.correct-trunk-cause.r400911.patch
>
>
> New channel request in dahdi_request currently returns AST_CAUSE_CONGESTION for group matched with no channel available, but returns AST_CAUSE_BUSY for channel matched. This is fine for non-trunk channels, but breaks dialplan logic for trunk channels (e.g. FXO with fxsks signaling), because AST_CAUSE_BUSY is interpreted as "unable to reach party by any means" and terminates trunk hunting logic e.g. in FreePBX. The corrected cause, AST_CAUSE_CONGESTION, is interpreted as "try another means to reach party", resulting in selection of next priority trunk as intended. This patch uses the ISTRUNK() macro to determine the cause:
> ISTRUNK(p) ? AST_CAUSE_CONGESTION : AST_CAUSE_BUSY

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