System Based On Voip, Sip And H.323 Interworking And Achieve

VoIP is a technology that transmit voice signal through Internet. There are two standards for signaling and control of IP telephone calls, namely ITU-T Recommendation H.323 and the IETF Session Initiation Protocol (SIP).H.323 is an umbrella standard that provides well-defined system architecture and implementation guidelines that cover the entire call authenticate, call set-up, call control and the media used in the call. SIP is a text-based protocol that was designed to word hand in hand with other core Internet protocol such as HTTP.Both protocol provide comparable functionality using different mechanisms and provide the same quality of service. H.323 protocol released more early and development comparison mature. It is used tradition telephone signal mode, convenience with current telephone net mutual communication. Now almost the entire IP-based telephone network is based on H.323 protocol. But opposite complicacy in H.323. SIP refer to other Internet standard and protocol, it has its owned design idea. SIP is more simpleness, flexible, opening and distributed. Although there are numerous industry debates about the merits of the two protocols, the truth is that both of them, along with other complementary protocols, are necessary to provide universal access and to support IP-base enhanced services.Both protocols have been widely used, so interworking between SIP and H.323 is essential to ensure full end-to-end connectivity. Because of the inherent differences between SIP and H.323, accommodation must be made to allow interworking between the two protocols.In this thesis, a new call system is established for simulation and verifying interworking between SIP and H.323. Five main components of this system are modeled by SDL/MSC: H.323 endpoint, H.323 gatekeeper, SIP-H.323 interworking facility, SIP server, SIP endpoint. Two configurations have been used in this model. One is that both protocols work within the same administrative domain, the other one is that both protocols are operating in separate administrative domain.