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Enterprises of all sizes are deploying Voice over Internet Protocol (VoIP) as a simple, cost-effective means to implement voice services across their organizations. But if VoIP is used only as a replacement technology for traditional phone networks, enterprises will not realize the full benefits of unified communications. It is clear that the enterprise needs to extend its IP PBX to VoIP remote users with hard phones, soft phones, WiFi/dual-mode phones and web phones. However, the Internet is an insecure means of transmitting data because there are opportunities for modification and eavesdropping. As well, a variety of publicized attacks and viruses have made it painfully obvious that the Internet is insecure. Traditionally, Virtual Private Networks (VPNs) and other security products, such as firewalls, have been deployed to create a secure tunnel across the Internet and to protect the enterprise against attack. But are traditional data security products, such as Internet Protocol Security (IPSec) VPNs, able to handle VoIP remote users or do you need VoIP specific products? Are IPSec VPNs even an option for unified communications on a mobile phone or hard phone? What are all the issues that need to be addressed to enable VoIP remote users? This paper will look at the requirements for securely enabling VoIP remote users.