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+Asterisk has a number of optional build dependencies.  If you intend to
+use any analogue PSTN hardware such as a DigiumTDM400P or plan on
+implementing a key system which uses the app_meetme conferencing plugin
+you will need to install the dahdi-linux and dahdi-tools software and
+drivers before compiling Asterisk. If you will instead use digital
+telephony hardware (not IP phones) such as T1/E1 lines or a PRI, you'll
+need to install libpri, again before compiling Asterisk.
+
+Be sure to see /usr/doc/asterisk-13.23.0/sample_confs/ after
+installation for any additional configuration files you may need.
+
+If you have plans of using Asterisk with a database backend you may
+want to install the alembic package. Since version 12.0 the database
+schemas that Asterisk uses are being captured in the form of python
+script files that use alembic to create/update database schemas. The
+asterisk package places these database scripts in the
+/usr/doc/asterisk-13.23.0/ast-db-manage directory.
+
+This build script supports the following flags:
+
+ * MOH : [default = no]
+
+   Set this flag to 'yes' if you would like to include some royalty-free
+   music on hold sound files with your installation. Setting this
+   option will cause the build to download some sound files from the
+   internet.
+
+ * SOUNDS_EXTRA : [default = no]
+
+   Set this flag to 'yes' if you would like to include the extra sound
+   package with your installation. Setting this option will cause the
+   build to download some sound files from the internet.
+
+ * VM_ODBC : [default = no]
+
+   Set this flag to 'yes' if you would like to store your voicemail
+   messages in a database. This plugin requires the unixODBC package.
+   This flag will override the VM_IMAP flag if both are set to 'yes'.
+   You will probably want to install the alembic package to configure
+   your database with the latest database schemas for Asterisk.
+
+ * VM_IMAP : [default = no]
+
+   Set this flag to 'yes' if you would like to store your voicemail
+   messages on an IMAP server. This plugin requires the University of
+   Washingtons IMAP server source. This flag will be overridden by the
+   VM_ODBC flag if both are set to 'yes'.
+
+ * G711_NEW : [default = no]
+
+   Set this flag to 'yes' if you would like to use the newer G711 codec
+   code. This requires a more powerful machine than would be normally
+   required.
+
+ * MEETME : [default = no]
+
+   Set this flag to 'yes' if you would like to build the app_meetme
+   plugin. This plugin is required for key style systems and
+   conferencing using meetme. This plugin requires the dahdi-linux
+   package for timing purposes.