Grandstream Phones are one of the most popular and leading brand names when it comes to VoIP phones. They have been in the market for quite a while and have garnered a lot of happy customers. Grandstream VoIP Phones offer superb sound quality with an outstanding level of functionality and compatibility. All Grandstream IP Phones are compatible with SIP protocol and work with the majority of VoIP PBX systems. Grandstream IP Phones are cost effective and designed for primary phone users all the way up to enterprise users and managers. Grandstream SIP Phones offer greater functionality including easy call handling features and quality. The ergonomic design of Grandstream VoIP Phones won world-class awards and designed for user-friendliness.