Download Voice over IP Protocols and Standards, This paper first discusses the key problems that inhibit voice over ip (VOIP) to be popular with the users. This document discuss the protocols and standards that exist today and are needed to form the VOIP product from totally different vendors to interoperate. the main focus is on H.323 and SIP (Session Initiation Protocol), that are the signaling protocols. we additionally discuss some hardware standards for internet telephony. Download the pdf from below to explore all topics and start learning.