MME: Incorrect formatting in GTP Serving Network

[gusbourg]

When sending a Create Session Request (and possibly other types of GTPv2 operations), the MME is incorrectly encoding Serving Network. The MME appears using the S1 plmnidentity which is encoded according to 3GPP 36.413 section 9.2.3.8 and encodes it in the GTPv2 CSR as Serving Network without coverting it to the format specified in 3GPP 29.274 section 8.18. As a result the serving network sent in the create session request is incorrect.

References:
36.314 Section 9.2.3.8
https://www.etsi.org/deliver/etsi_ts/136400_136499/136413/12.03.00_60/ts_136413v120300p.pdf

29.274 Section 8.18
https://www.etsi.org/deliver/etsi_ts/129200_129299/129274/10.05.00_60/ts_129274v100500p.pdf

[acetcom]

@gusbourg

You're right. PLMN-ID in ULI(E-CGI, E-TAI, ...) is also incorrect in Open5GS GTPv2 message. I'll fix it soon.

Thank you so much!
Sukchan

[acetcom]

@gusbourg

I've fixed the bug and updated it to the main branch.
Let me know if you have any further questions.

Thank you so much!
Sukchan

[github-actions]

This issue has been closed automatically due to lack of activity. This has been done to try and reduce the amount of noise. Please do not comment any further. The Open5GS Team may choose to re-open this issue if necessary.