The sip:provider CE system upgrade to mr4.2.1 will be performed in a couple of tasks:

For upgrading the sip:provider CE to release mr4.2.1, execute the following commands:

NGCP_CURRENT_VERSION=$(cat /etc/ngcp_version)
sed -i "s/$NGCP_CURRENT_VERSION/mr4.2.1/" /etc/apt/sources.list.d/sipwise.list
sed -i 's/wheezy/jessie/g' /etc/apt/sources.list.d/sipwise.list
apt-get update
apt-get install ngcp-upgrade-ce

Run the upgrade script as root like this:

ngcp-upgrade

	sip:provider CE can be upgraded to mr4.2.1 from previous release or previous build only. The script ngcp-upgrade will find all the possible destination releases for the upgrade and allow to choose the proper one.

The upgrade script will ask you to confirm that you want to start. Read the given information carefully, and if you agree, proceed with y.

The upgrade process will take several minutes, depending on your network connection and server performance. After everything has been updated successfully, it will finally ask you to reboot your system. Confirm to let the system reboot (it will boot with an updated kernel).

Once up again, double-check your config file /etc/ngcp-config/config.yml (sections will be rearranged now and will contain more parameters) and your domain/subscriber/peer configuration and test the setup. You can find a backup of some important configuration files of your existing installation under /var/backup/ngcp-mr4.2.1-* (where * is a place holder for a timestamp) in case you need to roll back something at any time. A log file of the upgrade procedure is available at /var/backup/ngcp-mr4.2.1-*/upgrade.log.

	sip:provider CE mr4.2.1 requires at least 2GB of RAM available as the minimum requirements of the installation section, otherwise certain features won’t work and you will run into arbitrary issues.