2N® IP Verso Door Intercom - Modular Door Intercom Basic Unit (without camera) The 2N 9155101 is a Basic Main Unit from the 2N IP Verso range of Modular Door Entry systems, designed to combine flexibility of function & specification with luxury & stylish finish. Described as the IP Verso ‘basic unit’, the 9155101 is the heart of a Verso I.P. Door Intercom System, around which additional Modules can be specified to build the exact specification for your final Door Entry device.