IP Phone Systems

How does IP Phone System work?
This System mainly operates with a special category. Input unit, Processing and output.
Input unit: PSTN (Public Switch Telephone Network) is related with Fax, Phone and Gateway. It is also related with Internet VoIP Protocol.
Processing Unit: In the middle step Processing (IP Phone System/ IP PBX).
Output Unit: It control with LAN (Local Area Network) and some IP Phones.

IP Phone System:
IP phone system or IP Telephony system also known as Internet Telephony. It Transmit the Call All over the Internet with a circuit switched telephony systems. It also worked with PSTN (Public Switched Telephone Network). It is connected with a VoIP service provider via LAN (Local Area Network)