trunk lines invisible

Dear reader,

First thanks for showing interest
I will be most obliged if some techie could guide me how to trunk
lines invisible from Telcos system
so it can not monitor traffic, are there any alternatives.

I am very new to VoiP and planning to operate a Gateway from Pakistan
of minimum 12 lines and have to find a way for not letting PTCL know about it since VoIP is banned here in Pakistan so could any techie expert like you tell me how to proceed what are reduntant lines T1 ? Do explain

Thanks
Altaf
Pakistan