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

[Michael Walton (JIRA)]

Michael Walton created ASTERISK-22756:
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             Summary: 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: 12.0.0-beta1, 1.8.24.0
         Environment: Any
            Reporter: Michael Walton
            Severity: Minor


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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