Section: 5.16.3.8.2 Access Selection for SMS over NAS
Content: It should be possible to provision UEs with the HPLMN SMS over NAS operator preferences on access selection for delivering SMS over NAS signalling. Based on the SMS over NAS preference: - SMS is preferred to be invoked over 3GPP access for NAS transport: the UE attempts to deliver MO SMS over NAS via 3GPP access if the UE is both registered in 3GPP access and non-3GPP access. - SMS is preferred to be invoked over non-3GPP access for NAS transport: the UE attempts to deliver MO SMS over NAS via non-3GPP access if the UE is both registered in 3GPP access and non-3GPP access. If delivery of SMS over NAS via non-3GPP access is not available, the UE attempts to deliver SMS over NAS via 3GPP access.