Well,so far I know this type of situation occcurs when there is strong interference. Thats why Bilal asked for C/I. Its impossible to find C/I of that cell as it will never be a serving cell untill its BSIC is decoded. I appreciate Pix for nice concept of TCH. But it is not possible bcause the site is almost standalone. Besides this some other problems arise in that site.
1.Handover not occured considering HOM=69
2.Call establishment problem
3.T3126 expired
So I think the problem lies in Hardware may be combiner or CU.