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 purpose of the subway emergency response system is that when an emergency occurs in the subway, tourists can seek help from relevant staff in a timely manner. The entire communication system is a complete and independent communication system, and all telephone terminals can be managed and set through ip pbx software.
Safe campus "one-click" emergency alarm intercom system solution, to promote the development of security information technology in the education industry, the use of integrated communications command technology in campus security management, to achieve smart campus operations.
The hotel voip telephone system solution is designed to meet the daily telephone communication needs of the hotel (hotel room customer service, front desk call, call transfer, etc.), and integrate the phone with other services through IP voice technology.