1. Take an international private leased line from Türk Telekomünikasyon A.Ş., apply cmpression to split in low bandwidth segments.
2. Put a gateway (switching, authentication IVRS) at your end.
3. Terminate the leased line at a remote gateway end (Say the US), and bounce all the calls on a in-expensive VoIP network.
4. Put a re-conciliation system at your end for billing consolidation.
I can provide more inputs and work on the entire solution.