Hi Natasha,
Sorry its interface btwn Bsc and Msc:)) R U facing problem in single Cell or in a group of cell.
If in one cell: 1. try to increase Signaliing link(packet Pipe)2. HW problem in BTS(TRX).
If Many BTS: A Ter interface HW problem in BSC.
Reply To: high TCH cong. with low Erlang