In short, PBX (Private Branch eXchange, private branch exchange) is the PBX, which is widely used in corporate offices, which greatly improves the efficiency of corporate affairs.
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There are two types of SIP proxy servers:
1) Stateless proxy server: A simple forwarding function that selects the destination and route of forwarding by requesting information. Messages are discarded as soon as they are forwarded.
2) Stateful proxy server: records incoming requests and sent request information (especially transaction status) and uses this to control future message processing. It also has a fork function for messages.
