This part of IEC 62820 specifies the technical requirements for the composition@ function@ performance and testing methods of Advanced Security Building Intercom Systems. This document is applicable for intercom systems used for any advanced security communication in buildings. Advanced security building intercom systems (ASBIS) are used for rapid emergency and danger messages verification by voice communication@ warning of a danger@ rapid notification of the responsible emergency services/intervention services and for sending instructions on how to proceed. The requirement for a suitable concept is prior risk assessment and a definition of the protection target. A Security management unit (SMU) is a necessary part of an ASBIS. The type of building and the usage of a building have influence on the risk calculation. In this document@ the relevant functions and performances are divided into three grades. According to the results of the risk calculation@ the security needs will be covered by an individual system profile. NOTE 1 Examples of typical profiles and each grades are defined in IEC 62820-3-2@ where a risk calculation is required. NOTE 2 The application of this document does not dispense to comply with the public national regulations concerning emergency systems. NOTE 3 Systems for emergency purposes can be the subject of approval by local authorities.