[Serusers] establishment call failure

[dimitris(yahoo)]

hi,
i am experiencing on little problem establishishing calls with my SER.
First of all , i am running ser under linux opensuse, (ser version: 0.9.6 )
, i also installed rtpproxy and made the needed changes to my ser.cfg.
When i "connetct" 2 different users with my SER locally , using softphone,
everything looks fine.
Gennerally the registration procedure using MySQL works fine(locally or
not).
When i am connected locally,  a remote user can call me with no problems...
The problem is the following, and i would appreciate if you could help me...
When i try to call a remote user, the call cannot be established from my
side. At the other side, the establishment of the call is ok.
The message is the following: No ACK recieved...
 
PS: I am only working now, till the level of the establishment of the
calls... When i solve this problem , i will continue to the voice and video
transmition, where i will need your help for sure...
 
PS2: In order rtpproxy to run on the same computer with SER, i type rtpproxy
with no parameters ?? can you help me with that too ???
 
Thank you in advance
 
I send you also my ser.cfg
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