socket problem again

Hi , Here i want to restate my problem. I want to run two different bts with different network parameters on the same PC, at the same time. I can not achieve this with one bsc_hack because bsc has a unique mnc. I can not run two bsc_hack at the same time because they try to use the same port. I think that there might be two approaches to solve this: 1) Modifying the code such that i can specify different mnc for each bts with one executable program. Maybe, two different gsm network can be defined as network1 and network2 (similar to bts0,bts1,...). So i can give different network parameters for different networks and run them with one program. 2) Changing the communication port of nanoBTS and OpenBSC such that i can run two bsc_hack at the same. I think that it should be changed on both nanoBTS and source code. Could any one help me (at least give some hints) about how i can implement one of these approaches. Or, You could propose some other approaches. Thank you. Jason