[asterisk-ss7] how to implement chan_ss7 with 4 OPCs + 1 DPC

[lizhong zhu]

hello, users:
I want to implement a scenario in this way: there are 10 servers with 10  PRI cards(4 port pri), but telcom provider only gives 
4 OPCs and 1 DPC. how do i set the chan_ss7.conf to let the servers share 4 OPCs and 1 DPC？if it can be done, 
how is the chan_ss7.conf for that? does anyone can give me a sample file for that?
thanks!
zhu