Session border controller (SBC) system

A session border controller (SBC) system, comprising an SBC signaling and media processing module, and at least one SBC signaling access module, wherein

• the SBC signaling access module is configured to:
• receive signaling sent by a terminal and forward the signaling to the SBC signaling and media processing module;
• and when the terminal is disconnected from a network during a call, re-register and reconnect the terminal, and after the terminal is reconnected, receive an information request from the terminal during the call and forward the information request to the SBC signaling and media processing module, wherein the signaling comprises the information request;
• and
• the SBC signaling and media processing module is configured to:
• process the signaling and media streams from the terminal, and when the terminal is disconnected from the network during the call, learn, based on the information request, a transmission link for communication with the terminal after the terminal is reconnected upon the disconnection from the network, wherein the signaling and media streams of the terminal after the terminal is reconnected upon the disconnection from the network are transmitted through the transmission link.