The sip:provider PRO version mr5.1.1 has several important changes comparing to the previous release:

Please find the complete changelog in our release notes on our WEB site.

	Make sure that all the SIP domains and peering servers have appropriate rtp_interface option (e.g. ext) selected in the NAT and Media Flow Control section. If you leave default there, then incorrect network interface may be used for sending and receiving RTP media after the software upgrade.

Make sure you’re prepared to spend two hours or so upgrading the system. There can be service interruptions, so also notify the customer and get their approval.

Check the system overal status:

ngcp-status --all

Check the system for locally modified files (move them to appropriate customtt.tt2 files if necessary):

ngcp-status --integrity

Try to find local changes to the template files by issuing:

find /etc/ngcp-config -name \*customtt.tt2

You will also need to find the dpkg-dist files under the templates files because people sometimes forget about creating customtt files and edit tt2 files directly. That makes upgrades not to replace the tt2 files. If so, you need to treat the tt2 files as if they were customtt files and make sure you merge the new templates with the changes of the old ones.

find /etc/ngcp-config -name \*.tt2.dpkg-dist

Also, please check/clean old dpkg backup files (just in case if previous person did the previous step not carefully enough). Normally the list should be empty:

find /etc/ngcp-config -name \*.tt2.dpkg\*

You will have to understand why the changes are there and if they are still needed after the upgrade. You should create a ticket in the bugtracker if there isn’t one yet.

Log into the two servers. Use their real IPs so you can switch the cluster forth and back later on. Make sure the cluster status is ok - on both nodes issue:

Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Seconds_Behind_Master: 0

A cluster fail-over could be a good idea to see if everything works on the second node too. On the standby node issue:

/usr/share/heartbeat/hb_takeover

Afterwards again check monit, cl_status and ngcp-collective-check.

Create two test subscribers, or retrieve the credentials for two of them. Register a client to the platform and perform a test call between the two to ensure call routing works.

Run "apt-get update", ensure you have no warnings/errors here.

	Installation may use locally specified mirrors. Discuss with a customer possibility to switch on Sipwise APT repositories (at least for the time of upgrades), the public Debian mirrors may not provide packages for old Releases anymore or be at least outdated!

The sip:provider PRO system upgrade to mr5.1.1 will perform a couple of fundamental tasks:

So assuming you have a running sip:provider PRO system and want to upgrade it, start on the inactive node by upgrading software, then take over from the other node and then upgrade the other (now inactive) node, as detailed in the steps below.

NGCP_CURRENT_VERSION=$(cat /etc/ngcp_version)
sed -i "s/$NGCP_CURRENT_VERSION/mr5.1.1/" /etc/apt/sources.list.d/sipwise.list
ngcp-approx-cache-helper --auto --node localhost
apt-get update
apt-get install ngcp-upgrade-pro

11.3.2. Upgrade the first PRO node

Execute ngcp-upgrade in inactive node as root:

ngcp-upgrade

	sip:provider PRO can be upgraded to mr5.1.1 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.

	If there is an error during upgrade, the ngcp-upgrade script will request you to solve it. Once you’ve fixed the problem just re-execute ngcp-upgrade again and it will continue from the previous step.

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).

ngcpcfg apply 'upgrade node'
ngcpcfg push --nobuild --noapply

/usr/share/heartbeat/hb_takeover

11.3.5. Upgrade the second PRO node

Go to the new inactive node. Run ngcp-upgrade, as root:

ngcp-upgrade

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).

When all finishes successfully check that replication is running. Check ngcp-status --all. Finally, do a basic functionality test. Check web interface, register two test subscribers and perform a test call between them to ensure call routing works.

	You can find a backup of some important configuration files of your existing installation under /var/backup/ngcp-mr5.1.1-* (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-mr5.1.1-*/upgrade.log.