This VoIP (Voice over IP) network diagram explains how digital voice communication flows over an IP-based system. The setup includes IP phones connected through Ethernet VLANs and switches to a VoIP PBX server using SIP (Session Initiation Protocol). The PBX server communicates with the PSTN through a SIP gateway, converting analog signals into digital ones. Remote users connect securely via SIP over TLS, while a firewall safeguards the internal network. This diagram highlights how VoIP systems efficiently transmit voice data over the internet using UDP, reducing costs and improving scalability for modern communication.
