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2. Application-level gateway - Wikipedia

   en.wikipedia.org/wiki/Application-level_gateway

   An application-level gateway ( ALG, also known as application layer gateway, application gateway, application proxy, or application-level proxy) is a security component that augments a firewall or NAT employed in a mobile network. [1] [2] It allows customized NAT traversal filters to be plugged into the gateway to support address and port ...

3. Network address translation - Wikipedia

   en.wikipedia.org/wiki/Network_address_translation

   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 while they are in transit across a traffic routing device. [1] The technique was originally used to bypass the need to assign a new address to every host when a network was moved, or ...

4. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Netopia Netopia supports ALG PF , built-in OpenBSD firewall PF can handle the NAT through the "static-port" directive and the bandwidth control through the built-in queuing system of SIP connections pfSense , a firewall / router distribution based on FreeBSD and PF ; has QoS that properly tags VoIP traffic and a SIP proxy package that is ...

5. NAT traversal - Wikipedia

   en.wikipedia.org/wiki/NAT_traversal

   UPnP Internet Gateway Device Protocol (UPnP IGD) is supported by many small NAT gateways in home or small office settings. It allows a device on a network to ask the router to open a port. Interactive Connectivity Establishment (ICE) is a complete protocol for using STUN and/or TURN to do NAT traversal while picking the best network route ...

6. Gateway (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Gateway_(telecommunications)

   A gateway is a piece of networking hardware or software used in telecommunications networks that allows data to flow from one discrete network to another. Gateways are distinct from routers or switches in that they communicate using more than one protocol to connect multiple networks [1] [2] and can operate at any of the seven layers of the OSI ...

7. Port forwarding - Wikipedia

   en.wikipedia.org/wiki/Port_forwarding

   Port forwarding via NAT router. In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall.