The users of the PBX phone system can communicate internally (within their company) and externally (with the outside world), using different communication channels like Voice over IP, ISDN or analog. A PBX also allows you to have more phones than physical phone lines (PTSN) and allows free calls between users. Additionally, it provides features like transfer calls, voicemail, call recording, interactive voice menus (IVRs) and call queues.
NEC IP7WW-12TXH-A1 TEL(BK) 12 Keys, Multi-Line LCD Display Speakerphone
NEC IP7WW-24TXH-A1 TEL(BK) 24 Keys, Multi-Line LCD Display Speakerphone
NEC SL1000 Keyphone System
NEC SL2100 Smart Communications System
NEC UNIVERGE SV8100 IP-PBX
NEC UNIVERGE SV9100 Communication Server
Panasonic KX-AT7730 Display Speakerphone
Panasonic KX-HTS824 Advanced Hybrid IP-PBX
Panasonic KX-NS300 Smart Hybrid PBX
Panasonic KX-TES824 Advanced Hybrid Keyphone System