IChat 5.0.3 to AIM 7.5 video chat problems.

Question

I could use some help, please?
   I have a cousin that live in another state and she wants to video chat with me and my mom.
My mom and I have Macs with Snow Leopard and iChat 5.0.3 and my cousin has a PC with Windows 7 and AIM 7.5. Both computers are notebooks and have Webcams built-in.
Whenever we tried to send a Video chat invitation from the PC to the Mac we would get a connection error on the Mac, but when we tried the same thing the other way (Mac to PC) it would go through and we can video chat. I am trying to figure out how to make Video chat invitations work both ways, iChat -> AIM and AIM -> iChat.
I have gone as far as changing the IM server on the Mac to match the IM server on the PC. I then tried to change the IM server on the PC to match the one on the Mac and got a connection error on the PC, so I just reset them both to their defaults.
I even went as far as turning off the firewall on the PC but that didn't work either. Now I'm stuck and can't figure out what to do.
Any information you have would help me and my cousin.

Answer 1

Hi,
iChat and AIM Logins first
In iChat Preferences > Accounts Server settings the default Login in login.oscar.aol.com if you are not using the SSL option
It will add a leading s if you do and this is an automatic change (slogin.oscar....)
The Default port is 5190 but almost anything can be used (we Suggest port 443) Changing this port sometimes helps with Videos (It shouldn't but does) on some routers (Zyxels).
iChat and Video to PCs
Firstly Video and Audio chat have nothing to do with the Login port (Although that is used for Text chats)
The AIM on PC app uses 4 ports to do the Audio and Video In and Out feeds
(iChat 3 used to).  iChat 4, 5 and 6 uses just one port to do the Video and Audio parts of the Chat (In and Out)
So iChat will send on port 16402 the SIP Invite (This is the behindf the scenes connection Process).
It uses the same port fro the A/V chat data.
If the PC starts then it sends an invite (SIP) on port 5061
When it connects it sends the data out on 2 ports from within the range 1024-5000 and asks for data back on two other ports (i.e one each for Vid in, Vid Out, Audio In and Audio out).
iChat does this by contacting a Server called SNATMAP.mac.com run by Apple just for connecting iChat Audio and Video chats.
This server helps the app negotiate the ports that are going to be used during the connection process.
(this happens on port 5678)
Now the Mac Firewall will allow any port that iChat Uses if the Firewall is On and iChat is allowed.
The AIM app is trying to connect on port 5061 when iChat is not already using it and this is most likely where the issue is.
WIth the Visible Invite iChat is supposed to use SNATMAP and this is supposed to "take" over getting the connection established but it seems it is not that smooth.
Possible workaround
Set the Login port to 5061 in ichat so the port is open anyway in the Mac Firewall.
Also make sure this port is allowed through your router.
9:52 PM      Monday; August 15, 2011
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