Hi pix/Kassem,
the problem found by Kassem is on air interface (LAPDm).
Which is the release SW on field? BR9.0? It seems that there are some MS types having some problem with low T200 values.
I can suggest you some settings used on field by an Italian network operator. It doesn’t claim any problem and has a very very low tassfail.
T200=60-31-60-90-90-90-135
T3105= 50ms
NY1=70