STD—Subscriber Trunk Dialling.
ISD—International Subcriber Dialling.
UPS—Under Postal Certificate.
BSNL—Bharat Sanchar Nigam Limited.
STD—Subscriber Trunk Dialling.
ISD—International Subcriber Dialling.
UPS—Under Postal Certificate.
BSNL—Bharat Sanchar Nigam Limited.