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modules: readme files regenerated - acc ... [skip ci]

Kamailio Dev authored on 16/11/2020 08:16:24
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@@ -795,6 +795,9 @@ modparam("acc", "acc_prepare_always", 1)
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    corresponding script variable is not defined or has $null value. If set
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    to 0, the value is saved as empty string (the existing behavior).
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+   Database columns may need to be altered to DROP NOT NULL constraints
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+   and DROP DEFAULT values in order to accept NULL values.
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+
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    Default value is 0.
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    Example 1.9. acc_extra_nullable example
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@@ -1148,6 +1151,9 @@ modparam("acc", "cdr_extra", "c1=$dlg_var(caller);c2=$dlg_var(callee)"
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    not defined in config operation (or set to $null) will be saved as
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    NULL.
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+   Database columns may need to be altered to DROP NOT NULL constraints
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+   and DROP DEFAULT values in order to accept NULL values.
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+
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    Default value is 0.
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    Example 1.36. cdr_extra_nullable example