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The SIP phones are the phones that utilize the Session Initiation Protocol for making and receiving phone calls. The SIP protocol is an Internet Engineering Task Force (IETF) standard that was first published in 1998. The SIP Phones are used by many businesses and individuals all over the world. Open Standard Session Initiation Protocol (SIP) to manage and set up calls between internet-telephony systems has certainly helped the widespread use of these phones. The reason for using this Open Standard is because it's a reliable, flexible, and scalable base for integrating different types of telephone services with SIP providers. It makes users prefer these phones very much even though they are a little more expensive than traditional analog or digital Cordless phones. If you are planning to buy a SIP phone, then this guide will help you in your decision-making. In this article, we have discussed some interesting things about the SIP phones that you need to know before buying ...