To consider another example, think of your cable or fiber modem.
#Enable sip alg how to#
If you think of gateways in terms of languages for computer communication, it is easy to see that these gateways form links that intuitively know how to talk to both networks. A gateway is like an interpreter who enables communication between people who speak different languages.įor example, you need a gateway for communication between an Ethernet network and a Token Ring network because both networks have different protocols.
#Enable sip alg software#
What is a Gateway?Ī gateway is hardware or software that enables communication between different types of networks. SIP ALG is enabled by default on most routers today. What then is ALG? Simply put, ALG stands for Application Layer Gateway. You now understand that SIP is a protocol used for signaling in VoIP networks. SIP ALG is a feature that is available on many routers. In simple terms, if you call a friend over VoIP, then SIP will set up the end-to-end connection to your friend’s phone, maintain the connection while you talk, and tear down the connection once you hang up. Signaling in telecommunication networks is a process for setting up, maintaining, and terminating voice/video/messaging sessions. Session Initiation Protocol or SIP is a protocol that is used for signaling in VoIP networks. The VoIP protocol stack also includes protocols other than the ones that are mentioned above. Similarly, the VoIP protocol stack is comprised of protocols such as Real-Time Transport Protocol (RTP) for carrying the actual voice/video packets, Secure Real-time Transport Protocol (SRTP) for carrying encrypted traffic, and Session Initiation Protocol (SIP) for signaling. Each of these elements has its own function, and when they work properly, we have a well-functioning system for traffic. The vehicles are what make up the traffic, the roads are the transport system, and the traffic lights provide the needed signaling. To consider an analogy, think of the road-based traffic system. These protocols all perform different functions such as signaling, transport, and encryption. VoIP is not a single protocol but is instead a protocol stack or group of protocols. Most modern voice and video communications are VoIP-biased.
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