#1 - VPN on WinXP is just computer to computer, not a true network-wide VPN. Your VPN needs to include the IP of the VoIP card and the IP phone. I would suggest using a VPN router, Linksys and Netgear make affordable ones.
#2 - All the settings for VoIP are listed under "IP Telephony", not under card or station programming. Definitely use G.729 codec, MH216 or later software on the CTX, and increase the jitter buffer. If you or your provider needs help configuring VoIP, send me an email or reply here.


Joe
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