You are absolutely right,However, what we must also look at, Is the transition problems the existing Callcenters face in order to Migrate from IPLC to VoIP. The budding & newly set up Callcenters are definitely taking the best advantage of the VoIP technology.Well,I am very much privileged to represent our company based In US that provides Solutions In Digitized VoIP.
The cost savings are considerable when Callcenters are Established & Managed On VoIP,to give a tip In India One needs to compare Annual cost of a 2 Mbps IPLC and 2 Mbps of Premium Internet Connection.
( For IPLC costs Kindly Add Up the Cost of the Half Circuit at the Origination End,As costs given by service providers in India is for Half Circuit)
Hope I am clear enough! If one needs a clearer picture on the cost advantage May be I can help.