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Voice-over-IP (VoIP) services are converging on SIP and RTP for signaling and real-time media delivery respectively. This paper will introduce the key elements of a SIP network, and describe the scalability and high-availability services provided by Zeus' Application Delivery Controller, ZXTM. Although SIP is an IETF standard, many implementations and extensions exist and mutual compatibility between different user agents cannot always be assured. Furthermore, organizations who wish to deploy advanced, differentiated SIP services need deep visibility and management of SIP traffic. ZXTM's full application-level inspection, driven by the TrafficScript programming language, makes it possible to compensate for any differences in behavior between applications and to rapidly prototype and deploy differentiated SIP services.
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