Which module of SMS gateway is responsible for buffering and forwarding messages?

Under the SMS gateway, the SendBuffer module is responsible for buffering and forwarding messages.

Only after the connection is successful will the sending and retransmission of the message be triggered. Each message will first enter the SendBuffer queue (that is, if the current connection is normal, it will be sent directly. If the connection is disconnected, it will be suspended, and it will be resumed after the connection or reconnection is successful.

Because it depends on the reliable transmission of TCP, the retransmission of the message only happens after successful reconnection. When the server starts or the application layer actively closes the connection, the peer will empty all cached messages and will not try to send or resend them. By using the SendBuffer module, the SMS gateway can improve the reliability of SMS sending while ensuring the speed of SMS sending.

System Security of SMS Gateway

In the design of hardware and software structure, SMS gateway should adopt distributed and modular equipment, in which the hardware equipment can adopt multiple hosts, and the load on the network can be shared through four-layer switches to avoid a single point of failure and realize the safety of the equipment. At the same time, SMS gateway adopts firewall technology, which can support IP packet filtering and application proxy to prevent external attacks and realize information security.

The connection between SMS gateway, SMS center and billing center adopts dedicated lines, and the connection with billing center also requires the charging center side to access the firewall, which ensures that the security of existing network equipment will not be reduced due to the connection with SMS gateway. With the development of technology, IPVPN technology can be considered between SMS gateways and between SMS gateways and SP to isolate the whole system from the Internet and improve the security of the system more effectively.