Despite being registered on Do Not Disturb (DND), a lot of telemarketing calls keep coming when we are busy at the office—there is no control.
The main reason this occurs is that many telemarketers bypass official channels by using 10-digit personal mobile numbers or unregistered 140/160 series numbers instead of official registered routes.
While DND filters primary promotional routes, rogue telemarketers violate Telecom Regulatory Authority of India (TRAI) regulations."l