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-The Asterisk Realtime Architecture
-----------------------------------
-
-The Asterisk Realtime Architecture is a new set of drivers and
-functions implemented in Asterisk.
-
-The benefits of this architecture are many, both from a code management
-standpoint and from an installation perspective.
-
-Additional information on the configuration of Realtime with Asterisk
-can be found in doc/extconfig.txt
-
-The ARA is designed to be independent of storage. Currently, most
-drivers are based on SQL, but the architecture should be able to handle
-other storage methods in the future, like LDAP.
-
-The main benefit comes in the database support. In Asterisk v1.0 some
-functions supported MySQL database, some PostgreSQL and other ODBC.
-With the ARA, we have a unified database interface internally in Asterisk,
-so if one function supports database integration, all databases that has a
-realtime driver will be supported in that function.
-
-Currently there are three realtime database drivers:
-
-* ODBC: Support for UnixODBC, integrated into Asterisk
- The UnixODBC subsystem supports many different databases,
- please check www.unixodbc.org for more information.
-* MySQL: Found in the asterisk-addons subversion repository on svn.digium.com
-* PostgreSQL: Native support for Postgres, integrated into Asterisk
-
-* Two modes: Static and Realtime
---------------------------------
-The ARA realtime mode is used to dynamically load and update objects.
-This mode is used in the SIP and IAX2 channels, as well as in the voicemail
-system. For SIP and IAX2 this is similar to the v1.0 MYSQL_FRIENDS
-functionality. With the ARA, we now support many more databases for
-dynamic configuration of phones.
-
-The ARA static mode is used to load configuration files. For the Asterisk
-modules that read configurations, there's no difference between a static
-file in the file system, like extensions.conf, and a configuration loaded
-from a database.
-
-You just have to always make sure the var_metric values are properly set and
-ordered as you expect in your database server if you're using the static mode
-with ARA (either sequentially or with the same var_metric value for everybody).
-
-If you have an option that depends on another one in a given configuration
-file (i.e, 'musiconhold' depending on 'agent' from agents.conf) but their
-var_metric are not sequential you'll probably get default values being assigned for
-those options instead of the desired ones. You can still use the same
-var_metric for all entries in your DB, just make sure the entries
-are recorded in an order that does not break the option dependency.
-
-That doesn't happen when you use a static file in the file system. Although
-this might be interpreted as a bug or limitation, it is not.
-
-* Realtime SIP friends
-----------------------
-The SIP realtime objects are users and peers that are loaded in memory
-when needed, then deleted. This means that Asterisk currently can't handle
-voicemail notification and NAT keepalives for these peers. Other than that,
-most of the functionality works the same way for realtime friends as for
-the ones in static configuration.
-
-With caching, the device stays in memory for a specified time. More
-information about this is to be found in the sip.conf sample file.
-
-* Realtime H.323 friends
-------------------------
-Like SIP realtime friends, H.323 friends also can be configured using
-dynamic realtime objects.
-
-* New function in the dial plan: The Realtime Switch
-----------------------------------------------------
-The realtime switch is more than a port of functionality in v1.0 to the
-new architecture, this is a new feature of Asterisk based on the
-ARA. The realtime switch lets your Asterisk server do database lookups
-of extensions in realtime from your dial plan. You can have many Asterisk
-servers sharing a dynamically updated dial plan in real time with this
-solution.
-
-Note that this switch does _NOT_ support Caller ID matching, only
-extension name/pattern matching.
-
-* So what can you do?
----------------------
-The realtime Architecture lets you store all of your configuration in
-databases and reload it whenever you want. You can force a reload over
-the AMI, Asterisk Manager Interface or by calling Asterisk from a
-shell script with
- asterisk -rx "reload"
-
-You may also dynamically add SIP and IAX devices and extensions
-and making them available without a reload, by using the realtime
-objects and the realtime switch.
-
-
-* Configuration in extconfig.conf
----------------------------------
-You configure the ARA in extconfig.conf (yes, it's a strange name, but
-is was defined in the early days of the realtime architecture and kind
-of stuck). Please see doc/extconfig.txt for database schemas.
-
-The part of Asterisk that connects to the ARA use a well defined family
-name to find the proper database driver. The syntax is easy:
- <family> => <realtime driver>,<db name>[,<table>]
-
-The options following the realtime driver identified depends on the
-driver.
-
-Defined well-known family names are:
-
-* sippeers, sipusers SIP peers and users
-* iaxpeers, iaxusers IAX2 peers and users
-* voicemail Voicemail accounts
-* queues Queues
-* queue_members Queue members
-* extensions Realtime extensions (switch)
-
-There is documentation of the SQL database in the file
-doc/extconfig.txt in your Asterisk source code tree.
-
-For voicemail storage with the support of ODBC, there is a
-doc/odbcstorage.txt documentation file.
-
-
-* Limitations
--------------
-Currently, realtime extensions do not support realtime hints.
-
-
-* FreeTDS supported with connection pooling
--------------------------------------------
-In order to use a FreeTDS-based database with realtime, you need to turn
-connection pooling on in res_odbc.conf. This is due to a limitation within
-the FreeTDS protocol itself. Please note that this includes databases such
-as MS SQL Server and Sybase. This support is new in the current release.