Hi,
I would like to implement SEMS as SBC.
User will register against the SBC which will forward the REGISTER to the PROXY 
behind it. 
After the registration, users (behind NAT) will be able to execute calls which 
will go to SEMS which will forward to the PROXY which will send the message to 
SEMS which will connect the end side.
The call flow is:
1. User A send REGISTER to SEMS.
2. SEMS pass REGISTER from A to PROXY
3. PROXY answer 200 OK to SEMS with transfer to User A
4. User B send REGISTER to SEMS.
5. SEMS pass REGISTER from A to PROXY
6. PROXY answer 200 OK to SEMS with transfer to User B
Now both user A and B are register in PROXY thgouht SEMS.
7. Now User A initiate call to User B.
8. User A send INVITE B to SEMS which pass the INVITE to PROXY which send 
INVITE to SEMS with B details and SEMS send the INVITE to User B.
9. After B answer we will have RTP path between A and B (through SEMS which is 
the SBC).
Is it possible? 
If yes, can someone guide me to the conf files (Examples)?
Thanks.
A
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