IChat gives wrong error message "busy in a different chat"

Question

An attempt within iChat to initiate an audio or video chat from an account on talk.google.com to another account on talk.google.com may succeed or fail. In my experience, if the remote account user is connecting to talk.google.com with an iChat client, the attempt succeeds; but, if the remote user is connecting with a Google Talk client on an Android device, the attempt fails. (Attempts at text chats succeed in both cases, but not audio or video chats.) Prior postings by Ralph indicate that this failure is expected. However, the failure is misreported by iChat to the local user. Instead of telling the user that the remote client is incompatible with iChat for audio or video chats, iChat tells the user "[remote user name] is busy in a different chat." That is false. The remote user is not busy in any chat. The local user's goal of understanding the nature of the problem is frustrated by this incorrect information.

Answer 1

Yeah but, ....
iChat will use the same Protocol (and ports) to make a Video or Audio connection to any Buddy from Any List.
That is to say that if you have an AIM list and contact an AIM Buddy and start a Video Chat then iChat will send a Visible Invite out on Port 5678 on the UDP Protocol
Then it will move to using SIP (Session Initation Protocol) on port 16402 and the UDP Protocol to send another "Behind-the-Scenes" invite as part of the connection Process.
The Failed Logs (In the Pop up that says Send to Apple) can be viewed in the Pop up (expand the "Details" triangle ).
If you start a Chat to a Jabber Buddy then the same process kicks in.
iChat even uses it to Bonjour Buddies.
Jabber Apps like Psi (if they have Video Capability) use a Process called Jingle to connect.
Google who run a Jabber server use their own Variant of Jingle in the Video Web Browser Plug-in and in the Standalone PC app called GoogleTalk as well.
This is not that compatible with other Jingle capable apps.
See http://en.wikipedia.org/wiki/Jingle_%28protocol%29
iChat using SIP and Jingle are not compatible.
Therefore iChat cannot Video Chat to anyone Logged in to Google in a Web Browser who is using the Google Video Plug-in
Nor the Standalone App
Nor and Jabber app that uses Jingle on Mac or PC
Put another way iChat will only Video chat to iChat as far as Jabber Buddies are concerned.
Hence all my running around with Jabber Apps and Web Browser Logins early in this Thread.
To be clear.
iChat 5 will not let you start a  Video Chat from the New Chat option in the File Menu if the person cannot video.
iChat 6 messes this up and does start Chats.  (both non Camera Buddies and Off Line people where it cannot tell their capabilities)
Messages Beta will tell you for On line but Not iChat Buddies but Not for the Off Line Buddies (which it will  try to Video Chat to)
10:24 PM      Wednesday; May 23, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
  iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously