Diameter EIR Call Flow

Figure 2-2 illustrates the steps of the diameter EIR call flow process.

1. MME/SGSN sends the ECR message to DAMP over S13/S13' interface links.
2. DAMP queries the UDR active and standby NOAMs in a round-robin manner for IMEI data. DAMP uses the ComAgent StackEvent request for querying the UDR DB.
3. UDR NOAM looks up the IMEI DB and sends a response to the DAMP. The response to DAMP is sent as a ComAgent StackEvent response.
4. EIR on DAMP receives the response from UDR; applies the business logic on received ComAgent StackEvent response; creates an ECA message; and encodes it to send to MME.

Figure 2-2 Diameter EIR Call Flow