IP Office Release 11.1 was made generally available in April 2020; Feature Pack 1 (Release 11.1.1) was issued in March 2021; Feature Pack 2 (Release 11.1.2) was issued in November 2021; Feature Pack 3 (Release 11.1.3) was issued in June 2023. This is the latest release of IP Office and is recommended for new development.
Note that the Powered by Avaya IP Office (Virtualized) deployments remain at IP Office Release 11.0.4; new capabilities introduced in Release 11.1 are relevant only for Customer Premise Environment (CPE) deployments.