Hi Macperk,
I have nothing new to add on the first stages of iCAR and any possible reference to it in com.apple.ichat.plist.
I think now you should get a trial of
IPNetMonitorX
Use the icon on that page to download.
Use this to do UDP Port scans.
These have to be done to an IP.
Start with a friendly Buddy who will tell you
their Public IP
You type in the port you want to scan and the IP to test against. If it fails it writes No Respomnse in little letters at the bottom.
Test these ports singularly: 5060, 5678, 5190 All on UDP.
Then the group 16384 - 16403 Again on UDP as this is why we are using this utility.
Then test the server IP that is issuing the ISP's public IP to you.
This will tell you:-
1) if there is any block.
2) may point out if it is local to you.
This presumes that:-
a) the Mac Firewall has iChat ports set if it is ON
b) the modem has those ports open if using Port Forwarding or Port Triggering.
8:02 PM Saturday; December 16, 2006