Call set up success rate is a function of SDCCH drop and TCH assignment unsuccess rate. Since no calls are being established on the cell with 100% SDCCH ACCESS failure, SDCCH Drop = 0. The only unsuccess on TCH stage is during HO. The traffic being seen on the cell is only HO traffic. The only solution to this kind of problem, is either sector recreation or BTS recretion – srart with sector recreation at the OMCR – if not solved, recreate the BTS.