Based on extensive testing and evaluation by its editors, the magazine cited Avaya's SIP solution for providing the best interoperability with third-party phones and a mature, rich set of features. SIP is a standards-based IP telephony signaling language that facilitates seamless interoperability among various media, including audio, video, instant messaging and presence. The test evaluation was conducted by Network Computing in its Real-World Labs® on the campus of Syracuse University. | 
