SIP Phones Explained

By Gary Audin

What is a SIP Phone? Manufacturers, vendors and service providers describe the Session Initiation Protocol (SIP) as if it were the foremost technical solution for Voice over IP (VoIP). It does have numerous benefits; SIP brings enhanced VoIP and powers other technologies such as SIP phones and SIP trunks. Understanding SIP and the uses for business allows users to make the greatest gains.

First Came the IP Phone

With the introduction of the proprietary IP PBX came the proprietary IP phone. An IP phone is designed to communicate over an Ethernet LAN network connection. It is fully interoperable on private networks as well as the Internet. The limitation is that IP PBX specific IP phones use their own unique proprietary signaling protocols. Therefore, users must buy the IP phones from the IP PBX vendor. Almost no other IP phones would work on the proprietary IP PBX.

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