I use my XLite softphone from my Win XP box over VPN to my
Cisco PIX with no issues so this can be done.
How that works for an ISA box is unknown to me. I
dumped ISA several years ago do to it's (IMHO) unpredictability and low
performance.
Are you using the built in VPN of WinXP or an ISA
Shawn,
I am running ISA 2004. As you know this
firewall is not SIP aware. Ive spoken with MS LCS devs and they dont
know of any SIP filters on the horizon. As far as IAX not sure why you
would be having problems.
In our environment we have an ISA 2004
firewall at the central office
