Those procedures are valid if your Wazo installation is newer than 16.08 and older than 18.01.
Example to upgrade to Wazo 17.02:
xivo-dist wazo-17.02 apt-get update apt-get install xivo-upgrade/wazo-17.02 wazo-upgrade xivo-dist phoenix
Example to upgrade to Wazo 18.02:
wazo-upgrade
This will upgrade your xivo to Wazo 17.17. From there:
upgrade to Wazo 18.02:
wazo-dist-upgrade -t wazo-18.02 wazo-dist phoenix-stretch
Procedures for upgrading to specific versions may freeze the version of your xivo. Run the following commands to get the latest updates:
xivo-dist phoenix wazo-upgrade