Panasonic NS 300 Digital IP EPABX System The NS 300 Panasonic model KX-NS300 Smart Hybrid PBX system is a truly cost effective and IP communication system for small and medium size companies (SME & SOHO) that can be flexibly configured and expanded according to your needs. The system start with 6 analogue trunks 18 extensions (2 digital + 16 analogue) and expandable up to 192 extensions with expansion unit. KX-NS300 is also a unified communication system (UC) which has advanced IP features such as mobile linking, integrated voice mail and email, instant messaging(chat), and presence information apart for the many other super features the system can offer.