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.
The Ip pbx telephone system is an internal telephone communication system based on an ip network and an ip pbx server. Nowadays, the ip pbx telephone system is not only used inside the enterprise as a commercial telephone system, but also widely used in industrial and public product emergency dispatch systems.
Ip pbx software is a communication server software based on ip pbx server running on window or liunix operating system. Ip pbx software includes system control from switch signaling to user interface, user to user, system to user, etc. Ip pbx software is the web interface user operation center of the application layer of ip pbx system. The hosted ip pbx server is the hardware of ip pbx software. Our self-developed ip pbx software, the underlying code is original, compiling and strong, we can develop ip pbx software according to the scale and applicable scenarios of the enterprise to meet the needs of all users.
Ip pbx is a pbx system with ip connection based on TCP/IP protocol, pbx is a switch that implements communication internal line, and ip pbx transmits ip signal in pbx to realize integrated communication system.