What are the benefits of an IP phones?

IP phone system, also known as voice over internet protocol, is a way and a set of technologies to deliver of voice and multimedia sessions over internet protocol (IP network). The terms IP telephony, broadband telephone, and broadband telephony service refer to the provision of communication services (voice messaging, fax, SMS and audio messages) over the internet, either the public Internet or through private internet connections, rather than via the PSTN, the public switched telephone network (PSTN). https://www.datavox.ae/yealink-ip-phone-dubai/