Regulator says designated numbers cannot be tagged or blocked except through DND preferences
CEO says 51 million calls go unanswered daily as spam visibility remains restricted
Regulator wants authority to address spam labels on 140 and 1600 series calls
Regulator wants IT Act authority as business calls face blocking and spam labels
TRAI says wireless base hits 1.29 billion while 14.46 million users port numbers in May.
