3GPP 24.501 v20.0.0 — the document's own text

5.3.20.1 General

Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).

This clause specifies the requirements for a UE that is not configured to use timer T3245 (see 3GPP TS 24.368 [17] or 3GPP TS 31.102 [22]) and receives a REGISTRATION REJECT or SERVICE REJECT message without integrity protection with specific 5GMM causes.

NOTE: Additional UE requirements for this case, requirements for other 5GMM causes, and requirements for the case when the UE receives an integrity protected reject message are specified in clauses 5.5.1 and 5.6.1.