This is where a SIP call flow diagram comes in handy. Elements in these call flows include SIP User Agents and Clients, SIP Proxy and Redirect Servers. SIP Workbench is a graphical SIP, RTP, STUN, and TURN protocol analyzer and viewer designed to help illustrate and correlate VoIP and IM network interactions. This article provides a general and technical introduction to SIP, and shows how SIP is an important enabler of telecommunication solutions. Dive deep into how SIP works for VoIP communications. , etc. Session Initiation Protocol (SIP) is a signaling protocol that is designed to initiate, maintain, and terminate communication sessions that include voice, video, messaging, and even fax between groups of participants. The topology shown in the diagram is known as a SIP trapezoid. Dec 11, 2025 · The File Transfer Protocol (FTP) is widely used in the application layer of networking. Setting up a call with SIP (Session Initiation Protocol) In the above example of a very basic call between two SIP endpoints.

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