![]() ![]() These proxy servers are tasked with relaying SIP messages between domains and finally to the client. ![]() It shows two peers that want to communicate with each other (SIP Client A and B): Generally the clients would live in different domains (called here domain A and B ) and each of them only talks to a proxy server responsible for their domain (so e.g. To give an overview of how a call is made we refer to the SIP trapezoid illustrated below. It is a text based protocol for client-server interactions similar in design to the Hypertext Transfer Protocol and it even shares some status codes, notably things like 200 OK and 404 Not found. The Session Initiation Protocol (SIP) is used as the signalling protocol for initiating (as the name suggests), maintaing and terminating to communication sessions between multiple peers. ![]() The core protocols: Session Initiation Protocol terminal output, code and SIP messages will be shortened for brevity and simplicity’s sake. We will give our best to keep it simple and only focus on the essentials, i.e. To the uninitiated in the dark arts of Voice over IP we want to apologize in advance for the acronym soup you are (unless you stop reading here) inevitably about to enter. This blog post will take you through our journey of implementing encrypted VoIP Calls and shed some light on the inner workings of it all. And while we already mentioned it in our development review of 2021 and design review of 2021 we wanted to take this opportunity to dive a bit more into the technical aspects of how all the gears interlock to make it work in Calls. GNOME Calls has supported Voice over IP (VoIP) calls for some time.
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