PSTN (Public Switched Telephone Network) or Landline

LOCAL call (within same exchange or multi-exchange) (call rate: 10 paisa/minute)
NWD:  Nation Wide Dialing, requires NWD code (call rate: 10 paisa/minute)
ISD: International Subscribers’ Dialing
(From an ISD phone, dial 00, then country code and number)

ISDN : (Integrated Services Digital Network) BTCL provides Value Added Services (VAS)  like  Call barring,  Abbreviated dialing,  Call  Conference, Call waiting, Wake up call  (Alarm),  Subscriber absence message facilities,  Call establish facilities to busy subscriber, Hotline facilities,  Call Forwarding,  Temporary disconnection on request, Don’t disturb message etc.  

Please contact your nearby BTCL Phones offices.