The NW Phone operates using the SIP protocol (Session Initiation Protocol), establishing and facilitating communication between devices. When integrated with the condominium's intercom, the application allows the user to receive calls from the conventional intercom on their mobile device or on the application installed on their computer.

When someone rings the condominium intercom, the NW Phone receives the signal via the SIP protocol, allowing the user to answer and interact remotely with the person at the condominium entrance. This is possible due to the integration of NW Phone with the condominium's communications infrastructure, providing residents with the ability to answer intercom calls from anywhere, using an internet connection.