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VoIp Usability 

 Firewall / VPN next

Simple Firewall
A simple firewall can not handle H.323. A application based firewall should be able to do this but this  is quite hard to implement.
VirtualPrivateNetwork (VPN)
The terminal PC becomes a member of the LAN. This solves the security issues but needs more bandwith.

For ADSL and xDSL Telekom Austria uses VPN technologies.