In EPS network feature support IE of "Attach Accept" message , it shows one item as "EXTENDED SERVICE REQUEST for packet services (ESRPS)". Please tell me how it is different than "Extended Service Request".
I was looking into NAS header. First four bits are used for security header type. Few values I understood but one value I could not understand which was 1100 saying "security header for service request message". I could not understand why such thing is defined only for service request message not for the other messages ?
