[Serusers] Ser, MediaProxy and Asterisk

Hello all, I'm trying to use a SER server for the following: | | | | ISP #1 ISP #2 Private Link Private LINK NATed SIP SIP Clients 172.18.xxx.yyy 172.16.5.xx Clients | | | | | | | | | | | ---------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------- SER with MEDIAPROXY ---------------------------------------------------------------- | | | ================ Asterisk (172.16.5.1) ================= | | PSTN I need asterisk to handle all the calls to the PSTN and event the SIP calls between them. I need to use the SER server as a tool to receive calls from any of the environments that I draw on top, and all communicating with Asterisk, even I also have a backup Asterisk box, that I can use in load balance with SER. I saw that there is a function "rewritehostport()" which I'm pretty sure it won't work since I will not keep the call in the SER server. I have made the NAT configuration of the Getting Started Guide, but I now that this is just part of what I need to build the complete solution. Can anyone please give me a hint in what is that I need to acomplish such task Thanks in advance Gerardo Amaya