Video Phone only works when specific user initiates connection

Hi,
I have an application based on the Cirrus Video phone demo as presented here:
http://labs.adobe.com/technologies/cirrus/samples/
In general, this works fine, but for one specific user with whom I test, I have the following issue:
When I initate the call, we are paired together by Cirrus, but his video/audio does not transmit to me. He can however see and hear me just fine.
When he initaites the call, everything works fine.
I'm concerned that this is an issue re. NAT/Firewall setup on standard home broadband connections, in that UDP is allowed through his firewall when the firewall sees that the connection has been initiated by him.
I'm a web developer, rather than a Flash developer, and I'm just looking for a few leads so that I can investigate this.
G

My application works as follows:
User1 (me) askes User2 (friend) if they would like to speak via AJAX text chat system
When User2 confirms that they would like to do this:
User1 browser loads Flash app
Flash app connects and obtains session key from cirrus
Flash app writes that session key to database
User2 browser loads Flash app
Flash app checks DB to see if session key exists
If not, it waits, and check again in 10 secs
When session key is finally found, Flash app connects to cirrus
Cirrus now exchanges network data between clients, and P2P connection is established
Call is placed from User2 to User1
User1 answers
Video and audio transmission starts from User1, and is received by User2
No Video and audio transmission is received by User1 from User2 (text chat over Cirrus is however possible)
All of this works in the majority of cases with other users, and when the roles are reversed, it also works.
The only time it doesn't work, it when I try to call my friend.
The behaviour described above can be seen in both my app, and the sample provided by Adobe at:
http://labs.adobe.com/technologies/cirrus/samples/
I hear what you are saying about RTMFP, but it really doesn't look like a coding problem, unless that problem also exists in the Adobe demo.

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