The Service Area Identifier (SAI) is used to identify an area consisting of one or more cells belonging to the same
Location Area. Such an area is called a Service Area and can be used for indicating the location of a UE to the CN.
The SAC is defined by the operator, and set in the RNC via OAM.
The Shared Network Area Identifier (SNA-Id) is used to identify an area consisting of one or more Location Areas.
Such an area is called a Shared Network Area and can be used to grant access rights to parts of a Shared Network to a
UE in connected mode (see TS 25.401).
Radio Voice Call Continuity
The Session Transfer Number for Single Radio Voice Call Continuity (STN-SR) is a public telecommunication number,
as defined by ITU-T Recommendation E.164 and is used by the MSC Server to request session transfer of the
media path from the PS domain to CS domain.