I have been trying to connect a gNB (Amarisoft Callbox Mini) where I deployed an NB-IoT cell to Free5GC. When the AMF receives the NGSetupRequest from the gNB, I get the following error message: “NGAP decode error : OpenType reference value does not match any field”.
I think this is due to the presence of the “id-NB-IoT-DefaultPagingDRX” protocol IE in the NGSetupRequest. It looks like all of the protocol IEs supported are declared here but NB-IoT-DefaultPagingDRX is not in there.
So I think it is why there is an NGAP decode error.
Here is a Wireshark file where I captured the NGSetupRequest (you can apply ngap filter to see it) ng_setup_request.pcap (2.5 KB)
NB-IoT-DefaultPagingDRX for NGAP is defined in the TS 38.413, and its presence is marked as mandatory.
If NB-IoT is not supported, do you plan to support it in the future ?