2 A-Interface specification objectives
08.013GPPGeneral Aspects on the BSS-MSC InterfaceRelease 1999TS
The MSC to BSS interface specifications shall allow the following:
i) Connection of various manufacturers BSSs to the same MSC;
ii) The use of several manufacturers MSCs to the same type of BSS;
iii) The use of the same BSS in any PLMN;
iv) The use of the same MSC in any PLMN;
v) The separate evolution of MSC and BSS technology, and;
vi) The separate evolution of O&M facilities;
vii) Evolution towards lower speech coding rates;
viii) Support of all services defined in the 3GPP TS 02 series of Technical Specifications.