We have updated the 3GPP LTE and NAS ASN.1 API’s we have available for use with ASN1C. These API’s are available at the following URLs:
https://obj-sys.com/products/asn1apis/lte_3gpp_apis.php
https://obj-sys.com/products/asn1apis/nas_apis.php
There are 5G and LTE API's available for releases 16, 17, and 18.
The NAS API's contain support for the latest release 17 and 18 versions of the TS 24.501, 24.301, and 24.008 specifications.