This definition appears somewhat frequently
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Samples in periodicals archive:
"SIP, SIP, SIP" that's all we hear lately. Why? Simply put, the Session Initiated Protocol (SIP) is the means to an end, bringing about the convergence of communications. SIP is the conduit that will bring together the enterprise and telecommunications to provide IP-based communications. Enterprises have worked for many years to provide triple-play — voice, video, and data — services.