A SIP caller is a software application that allows users to make phone calls over the internet using the SIP (Session Initiation Protocol) protocol. SIP is a standard protocol for initiating, maintaining, and terminating multimedia sessions, including voice, video, and instant messaging.
SIP callers have a number of advantages over traditional phone service, including lower costs, greater flexibility, and more features. SIP callers can be used to make calls to any phone number in the world, and they can also be used to make video calls, send instant messages, and share files. SIP callers are also typically more flexible than traditional phone service, allowing users to make calls from any device with an internet connection.
