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  • AMIT ROYCHOWDHURY thinks this is interesting:

stdextengosubWhen using users.conf, the hasvoicemail=yes option invokes a stdexten routine. In Asterisk 1.4, this would be done using a macro, but in later versions of Asterisk it uses a GoSub (the preferred method since Asterisk 1.6.0). This option is used for backwards compatibility.

From

Cover of Asterisk: The Definitive Guide, 4th Edition

Note

stdext