Abstract: An intercommunication system includes one or more modular units utilizing a standards-based audio-over-IP configuration. The modularity of the system provides improved scalability. For instance, a number of audio channels is not limited by physical constraints (e.g. number and type of ports) of a central switch. Accordingly, the addition of audio channels may not require swapping one central switch for a larger switch. Moreover, security applications may be layered onto the standards-based audio-over-IP configuration to implement security requirements often found with intercommunications systems.