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Method and media gateway for per-session network address translation (NAT) learning and firewall filtering in media gateway
Method and media gateway for per-session network address translation (NAT) learning and firewall filtering in media gateway
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机译:用于媒体网关中的每个会话网络地址转换(NAT)学习和防火墙过滤的方法和媒体网关
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摘要
Methods and systems for per-session NAT learning and firewall filtering are disclosed. Media packets associated with a call/session are received and processed at a media gateway. For the first few received media packets associated with a session, the media gateway uses various unique methods to learn the actual source IP address and UDP port assigned to the remote communication terminal by its customer-premises Network Address Translators (NATs) to the media flows of the current session. After the remote IP and UDP are learned, the media gateway reconfigures its firewall filtering function to check both the dynamically learned remote IP and UDP and the locally assigned IP and UDP of the current session. The per-session NAT learning function removes reachability issues in VoIP deployment, and the per-session firewall filtering function enhances security protection in VoIP deployment.
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