Avaya has maintained support for past, legacy endpoints, and continues to add support for newer telsets. Even with this, some sets may be feature limited. Please keep this in mind when upgrading an existing system
-Any Analog Endpoint. Supported natively through analog station ports.
-Older 4 Wire (2 Pair) digital endpoints, including 74XX and 84XX sets. This is only true for older G650 and SCC/MCC gateways types due to supported card interfaces
-2 Wire (1 Pair) digital endpoints, such as 64XX, 24XX, 14XX, and the newest 94XX sets. The 54XX series manufactured for Avaya IP Office are not supported.
-H.323 IP Sets, including 46XX, 16XX, and 96XX and 96X1 sets. The 56XX series manufactured for the Avaya IP Office are not supported
-Any SIP based endpoint through Session Manager. Some additional programming maybe required, but Session Manager observes the open SIP standard.