Create upgrade_0522_to_0523.rst

docs/upgrade_0522_to_0523.rst

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+Upgrade dSIPRouter
+====================
+
+In this section we will show you how to upgrade from 0.522 to 0.523.
+
+Before starting the upgrade process you will need to backup your kamailio database using the following command: 
+
+.. code-block:: bash
+  
+  cd /opt/
+  mysqldump kamailio > kamailio-bk.sql
+
+
+After you've backed up your database you can now uninstall dsiprouter v0.50 by running the following commands: 
+
+.. code-block:: bash
+
+  cd /opt/dsiprouter
+  ./dsiprouter.sh uninstall
+
+
+Once the uninstall is complete you will need to either move or delete the /dsiprouter directory using the following command.
+
+.. code-block:: bash
+  
+  mv /dsiprouter /usr/local/src (moving directory)
+
+Alternatively:
+
+.. code-block:: bash
+
+  rm -r /dsiprouter (removing directory)
+
+
+Installing dsiprouter v0.523
+
+.. code-block:: bash
+  
+  cd /opt/
+  apt-get update
+  apt-get install -y git curl
+  cd /opt
+  git clone -b v0.523 https://github.com/dOpensource/dsiprouter.git
+  cd dsiprouter
+  ./dsiprouter.sh install
+
+
+**Note: please take note of the credentials given after the script has completed.**
+
+After the install is completed you can now restore your kamailio database using the following command:
+
+.. code-block:: bash
+  
+  cd /opt/
+  mysql  kamailio < kamailio-bk.sql
+
+
+After the kamailio database is restored you need to restart dsiprouter using the following commands:
+
+.. code-block:: bash
+  
+  cd /opt/disprouter/
+  ./dsiprouter.sh restart 
+
+
+After the install is complete and the dsiprouter service has been restarted, the login screen should now reflect v0.51 and you should be able to login with the dsiprouter credentials provided after the install completed.
+
+.. image:: images/dsip_v51.png
+        :align: center
+