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An application-level gateway (ALG) is a security component that augments a firewall or NAT and supports address and port translation for certain application layer protocols. Learn about the functions, examples and implementations of ALGs in Windows, Linux and other networks.
A comprehensive list of software applications that use Session Initiation Protocol (SIP) as a voice over IP (VoIP) protocol. The list covers servers, clients, mobile clients, session border controllers and enabled firewalls.
Network address translation (NAT) is a method of mapping an IP address space into another by modifying network address information in the IP header of packets. Learn about the history, types, methods and applications of NAT, and how it relates to IPv4 address exhaustion.
NAT traversal is a technique of establishing and maintaining Internet Protocol connections across gateways that implement network address translation (NAT). UPnP Internet Gateway Device Protocol (UPnP IGD) is one of the methods that allows a device on a network to ask the router to open a port.
A DMZ or demilitarized zone is a subnetwork that exposes an organization's external-facing services to an untrusted network, such as the Internet. Learn how a DMZ works, what services it can host, and how it differs from a proxy server or a reverse proxy server.
A session border controller (SBC) is a network element that protects and controls SIP based VoIP networks. It provides security, connectivity, QoS, regulatory, media services, and statistics functions for VoIP calls.
MGCP is a telecommunication protocol for signaling and call control in hybrid voice over IP and traditional telecommunication systems. It uses UDP port 2727 for communication between media gateway controllers and media gateways, which provide conversion of media signals between circuit-switched and packet-switched networks.
IPsec is a set of protocols that provide authentication and encryption for data packets over IP networks. It supports various security services and modes, such as Authentication Header (AH) and Encapsulating Security Payload (ESP), and is used in virtual private networks (VPNs).
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