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2. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   Virtual PBX systems or hosted PBX systems deliver PBX functionality as a service, available over the public switched telephone network (PSTN) or the Internet. Hosted PBXs are typically provided by a telephone company or service provider, using equipment located in the premises of a telephone exchange or the provider's data center. [ 13 ]

3. The Benefits of VoIP Phone Systems - AOL

   www.aol.com/benefits-voip-phone-systems...

   Although cloud-based phone systems benefit small businesses, there are drawbacks. ... (PBX) systems. A PBX system requires infrastructure inside the building to manage multiple lines and advanced ...

4. List of telephone switches - Wikipedia

   en.wikipedia.org/wiki/List_of_telephone_switches

   NEAX31 (Discrete Electronic CPU, 4-stage Crossbar switching fabric, PBX) NEAX12 (Analog / Digital Hybrid PBX) NEAX22 (Analog / Digital hybrid PBX) NEAX 2000/1000; NEAX2400 (Fully Digital PBX) XN120; NEC Univerge SL1000 (Small or Medium Sized, VoIP And TDM) Enterprise IP Systems NEC Univerge SV7000 (Fully IP, VoIP and TDM) Pure IP Communication ...

5. AT&T Merlin - Wikipedia

   en.wikipedia.org/wiki/AT&T_Merlin

   Earlier Bell attempts at an electronic key system, such as Horizon and Dimension, were not as successful as were the much larger systems; in fact, Dimension was a PBX. The Merlin was the first small electronic system, replacing the Com Key 416.

6. Telephone exchange - Wikipedia

   en.wikipedia.org/wiki/Telephone_exchange

   A PBX serves an organization's telephones and any private leased line circuits, typically situated in large office spaces or organizational campuses. Smaller setups might use a PBX or key telephone system managed by a receptionist, catering to the telecommunication needs of the enterprise.

7. IP PBX - Wikipedia

   en.wikipedia.org/wiki/IP_PBX

   An IP PBX is a PBX system with IP connectivity and may provide additional audio, video, or instant messaging communication utilizing the TCP/IP protocol stack. Voice over IP (VoIP) gateways can be combined with traditional PBX functionality to allow businesses to use their managed intranet to help reduce long distance expenses and take ...