IPLC on fiber is provided by FLAG , MCI , French Telecom etc…it is not provided currently by PTCL. PTCL provides IP on fiber and a roof top back up.
If you have the NOC to operate a call center you will not have a problem with obtaining it otherwise.
You can contact the coporate services wing of PTCL for IPLC. For a smaller center you will not need IPLC anyways.