A Windows SIP phone client is a software application that allows users to make and receive phone calls over the internet using the Session Initiation Protocol (SIP). SIP is a signaling protocol that is used to establish, modify, and terminate multimedia sessions such as voice and video calls.
Windows SIP phone clients offer a number of benefits over traditional landline phones, including lower costs, increased flexibility, and improved features. SIP phone clients can be used to make calls from anywhere with an internet connection, and they can be easily integrated with other business applications such as customer relationship management (CRM) systems. Additionally, SIP phone clients often offer a wider range of features than traditional landline phones, such as call recording, call conferencing, and voicemail.