[OpenSIPS-Devel] questions about inter-domain roaming

[zhangchao00001]

Hello everybody, I have some questions about Inter-domain Roaming.
________________________________
|                               | 
|     C1 at DomainA  C3 at DomainB    |
|_______________________________|           
|_____________NAT_______________|Domain B
|                               |
|_____________P2________________|
               |       
               |
               |
     __________|___________
     |                    |
     |     P1(S1)         |
     |                    |           
     |                    |
     |     C2 at DomainA     |
     |____________________|
            Domain A
Here is my experiment environment(the picture above):there are two Domains A and B, C1、C2 belong to Domain A, C3 to Domain B, P1 and P2 are proxy server. C1 roams in Domain B and register to P1 through P2. then C2 want to make a telephone to C1, C1 and C3 have the private ip address and connect to P2 throught nat(port reserved) device. I want to ask how to write the correct config file to make the call? Because P2 dosen't have the C1 in its location table, when the Invite message come to P2, P2 dosen't know where to send the Invite message. if P1 send the Invite message to C1 directly, the nat device will block it.
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