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It is expected that real-time person-to-person communication, like IP telephony (VoIP), presence, instant messaging, voice, video and data collaboration will be the next big wave of Internet usage. The Internet standard for such communication is SIP (Session Initiation Protocol). For businesses looking to join this burgeoning SIP user community, it is important to ensure that the enterprise network is adequately prepared and safeguarded. However, universal connectivity across the Internet is frequently thwarted because the NATs and Firewalls in an existing network are not SIP capable – a common situation for businesses of all sizes.