Overlay is a telephonic numbering system,
which allocates numerous area codes. Further, some geographic numbering plan
area takes these codes, which belong mostly to North American Numbering Plan.
Global enterprises strive to attain service excellence so that they can stay ahead in a competitive environment.
TBharat Sanchar Nigam Limited (BSNL) started its operation and installed Quality Telecom in the nation.
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History of Call Center