Asterisk 21 is scheduled to become the next major release. As part of that process there are a number of modules being removed, see: wiki.asterisk.org.
Patches can be obtained via the individual reviews linked to each issue listed above.
Of the modules removed, three stand above the rest in terms of complexity and required actions.
- chan_sip – deprecated as of Asterisk 17, chan_sip has finally been removed from Asterisk as of version 21. If you have not yet moved your systems to chan_pjsip, please see the following wiki page regarding the migration.
- app_macro – deprecated in Asterisk 16 but has remained longer than usual due to it’s extensive use in examples, documentation, and production. Another module that has a replacement – see Gosub; for some time.
- res_monitor – deprecated in Asterisk 16, also saved from removal due to continued use. MixMonitor has long since been in use in it’s stead.