12). Each would require however separate DHCP servers so that firewall protection could be easily integrated within the system (Kuhn, Walsh & Fries, 2005; Flatland, 2005). H.323 SIP and other VOIP protocols can be disconnected at the voice gateway that interfaces with the PSTN to allow for stronger authentication and access control on the gateway system (Kuhn, Walsh & Fries, 2005). However this can make key management problematic. Other ways to secure the data and voice network include implementing "packet filters" to track malicious connections (although this doesn't always work and is not always sensible) or IPsec and Secure Shell to manage remote voice and data access so hijackers can't utilize the remote system (Kuhn, Walsh & Fries, 2005).

If performance declines because of security measures then the organization can take advantage of encryption at a gateway like the router rather than "individual endpoints" which would allow "IPsec tunneling" however...
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