Is SCP must for SEPP roaming

[rajakashif]

Our scenario is local breakout
VPLMN : AMF, SMF, UPF from Open5GS while NRF and SEPP from another vendor
Interconnect --> SEPP from another vendor
HPLM --> SEPP, AUSF, UDM, UDR from another vendor

[acetcom]

@rajakashif

We designed 5G roaming with SEPP to work with or without SCP, in order words regardless of SCP.

Thanks a lot!
Sukchan

[rajakashif]

Thank you @acetcom . And has the below 5GRoaming scenario with IPx SEPP been tested before
VPLMN : AMF, SMF, UPF from Open5GS while NRF and SEPP from another vendor
Interconnect --> SEPP from another vendor
HPLMN --> SEPP, AUSF, UDM, UDR from another vendor

[acetcom]

I've seen other people share that they've done that, but I've never done that in the real environments.

In general, I rarely experiment in the real world, so I don't know much about that.

[gustavobsch]

@rajakashif I've done some of this. With Oracle SEPP in the middle of two Open5gs acting as VPLMN and HPLMN

@acetcom how can the roaming scenario work without SCP given the V-AMF talks to the V-SCP which in turn does the discovery of H-AUSF, H-UDM, etc? how can the V-AMF talk directly to V-SEPP?

[rajakashif]

And what if we had to replace the open5GS SEPP in vPLMN with Oracle SEPP/ @gustavobsch

[acetcom]

@gustavobsch

It uses NRF to find SEPPs, so it works fine without SCP.

Replace all NFs configuration files with the following, and don't run SCP.

$ diff --git a/configs/open5gs/amf.yaml.in b/configs/open5gs/amf.yaml.in
index 24e2c9757..852c29396 100644
--- a/configs/open5gs/amf.yaml.in
+++ b/configs/open5gs/amf.yaml.in
@@ -14,10 +14,10 @@ amf:
       - address: 127.0.0.5
         port: 7777
     client:
-#      nrf:
-#        - uri: http://127.0.0.10:7777
-      scp:
-        - uri: http://127.0.0.200:7777
+      nrf:
+        - uri: http://127.0.0.10:7777
+#      scp:
+#        - uri: http://127.0.0.200:7777
   ngap:
     server:
       - address: 127.0.0.5

Please let me know if you have any further questions.

Thanks a lot!
Sukchan

[gustavobsch]

@rajakashif I havent used Open5gs 2.7.1 SEPP because it requires 2 IPs for N32 so Only tested with Oracle SEPP so far