This is an Advanced Hybrid PBX central device by Panasonic used to organize external and internal phone lines in companies or offices. Basic capacity  • Supports up to 3 external lines (CO lines).  • And 8 internal lines (Extensions). 👉 Can be expanded to 6 external lines and 24 internal lines using additional cards. Main functions - Call transfer between internal and external lines. - Support for Panasonic phones dedicated to the central as well as regular phones. - Ability to connect a fax machine – modem – automatic answering device. ✔ RS-232 port for connecting to a computer for call logging or control. Additional features  • Doorphone/Opener interface.  • Switching modes between tone/pulse in external dialing.