NGAP specification version

Hi Free5GC Team,

I have installed Free5GC stage 3 and able to execute it successfully.
Now trying to build a gNB NGAP message simulator.
I am interested to know which version of 38.413 specification is used for NGAP messages.
Please reply.

Best Regards
Lakshmi

According to free5gc’s official site, all 5G core is base on 3GPP 15.3 version.

Thanks for your information.