25.5.6 Process Obtain_Authent_Sets_HLR
29.0023GPPMobile Application Part (MAP) specificationRelease 17TS
This process is used to provide authentication vectors (triplets or quintuplets) in response to a request from a VLR or an SGSN.
Upon receipt of an authentication information request for a UMTS subscriber, the HLR shall return authentication quintuplets. If the user is a GSM subscriber, the HLR shall return authentication triplets.