Notice (No. 974) on the supply and installation of IP desktop telephone systems via fiber optic cable, for communication from the National Control Center (NCC) to various substations, including: GS1, GS2, GS3, GS4, GS37(STR), GS44(RTK), GS50(MKD), GS48(SNG), GS63(STT), GS36(PHV), GS40(KTH), GS31(SR2), GS94(SVL), GS49(SNS), GS45(SST), GS43(CKL), GS36(STH), GS46(BSK), GS20(KMP) and GS18(TAKEO) (End of 03)