[Serusers] Ser, MediaProxy and Asterisk

[Gerardo Amaya]

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