In Asterisk, a macro is a special kind of context which can be expanded within the definition of another context. Its name must begin with “macro-”. A macro is expanded by using the Macro command.
All the lines of the macro definition should only use the s extension; the actual extension will come from the line in the calling context on which the macro is expanded.
Within the macro definition, use the variable substitution ${MACRO_EXTEN} to refer to the actual extension.
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