3GPP 24.501 v20.0.0 — the document's own text
7.7.3.1 Syntactically incorrect optional IEs
Taught in 7. What a NAS message looks like on the wire (CT1 — the group that writes what your phone says, in depth), 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The UE shall treat all optional IEs that are syntactically incorrect in a Type 6 IE container information element as not present in the Type 6 IE container information element.
The network shall take the same approach.
EXAMPLE 1: If the Type 6 IE container information element includes 2 type 6 information elements, and the first one is syntactically incorrect, the receiver ignores the first information element and continues with the processing of the second one.
EXAMPLE 2: If the remaining value part of a Type 6 IE container information element is too short to contain a complete type 6 information element, the receiver ignores these octets and continues with the processing of the octets following the Type 6 IE container information element, if there are any.