VoIP is a technology that uses IP network to implement voice communication. It can achieve voice and data transmission on the same network, thereby improving network bandwidth utilization. IP phone is a traditional phone service based on IP network, which is usually provided by operators or ISPs. Internet phone or Voice On the Net (VON) is a voice communication service based on IP network, which is mainly used on the Internet.
The guide introduces Voice over IP (VoIP) technology, describing how voice calls are transmitted as data packets over IP networks and the various terminology such as IP Telephony, Internet Telephony, and LAN Telephony. It outlines the benefits of moving voice communication onto IP infrastructure, including cost reduction, simplified management, and the ability to integrate voice with video and data.
The document also details common VoIP scenarios—device‑to‑device, device‑to‑telephone, and telephone‑to‑telephone—along with the required building blocks such as IP networks, PSTN gateways, and VoIP endpoints. Additional sections cover LAN Telephony implementations, comparison with traditional PSTN, and the use of integrated access routers (IADs) for small‑office VoIP deployments.
VoIP is a technology that sends phone calls as a series of data packets over an IP communication infrastructure.
Interconnection gateways are used to bridge between VoIP networks and the PSTN.