Nox systems can intrgrate to Milestone Proffesional kernel, but can intrgration run on Advanced Platform,
If you have an existing integration that works for Milestone Professional then it is probably still working on Milestone advanced (XProtect Corporate, Expert and the new Plus products).
See this knowledge base article - https://force.milestonesys.com/support/articles/en_US/FAQ/About-MIP-SDK-compatibility-with-XProtect-product-versions