I am using Topos module to hide network topology. I am having a problem of routing the ACK request for REINVITE. Here is the schema:

A                   KAMAILIO           B

1.         --------- INVITE  -------->  

2.         <---- 180 RINGING  ---

3.         <----  200 OK            ---

4.         ----           ACK         --->

5.         <--------- (RE) INVITE  --

6.         --------- OK                --->

7.        <----           ACK         -----     (THIS ACK IS SENT TO PRIVATE IP OF A)

I use TOPOS module along with fix_nated_contact as I would do normally for natted UAs. The first ACK (4) is routed correctly but not the second one (7), which is routed to the PRIVATE IP of A instead of routing to its public address.

Has anyone run into this problem while using TOPOS module? How could I make them work together?

Best Regards,

Minh Phan