asterisk users - Aug 2004 - Strange H323 problem

Hello.
I have a very strange H323 problem. This is the situation: I have a 
Cisco 7960 phone (with IP address 10.1.1.21) connected to a Cisco 
CallManager (with IP address 10.1.1.10) and an Asterisk with IP address 
10.1.1.22. I have managed to make the CallManager to call to asterisk 
using a route pattern. The strange thing is that when the call is 
established one RTP stream goes from 10.1.1.21 (phone) to 10.1.1.22 
(asterisk) and the other goes from 10.1.1.22 (asterisk) to 10.1.1.10 
(CallManager).
Can somebody point me if the problem is on the asterisk side or in the 
CallManager side?

If somebody needs it, I have  the complete  ethereal session in 
http://www.totexa.cl/ccm_session

Thanks.
Andr?s