With effect from billing period Nov'11 (Bill dates between 01.12.2011 to 31.12.2011),  Calcutta  Telephones will migrate to State of the Art Call Detail Record (CDR)  billing  system for all  landline and broadband customers.

       Features of CDR based billing system:-

• CDR bill is Account based instead of invoice based. So after migration your bill will include two items: 1, Current period billing and 2. Previous period outstanding balances if any.
  
  
• For customers getting bi-monthly bills, such bi-monthly bills will be issued on monthly basis from billing period October, 2011 (Bill dates between 01.11.2011 to 30.11.2011) onwards till migration in new billing system (CDR). Thereafter bi-monthly billing will be restored.
  
• Unlike existing bill, no opening MR data, Closing MR data will be available in CDR bills. Instead in the new billing system (CDR) call details record will be available in our new website.
  
  
• After migration to new billing system (CDR), facility of free call units will be shown in the form of equivalent monetary discount in the CDR bill like Mobile Bill.
  
  
• After migration if you pay your bill by cheque , please note that your cheque must be drawn in favour of AO(Cash),BSNL, Calcutta Telephones instead of AO, BSNL, Calcutta Telephones. Calcutta.
  
  
• We seek your support in our efforts to ensure a smooth transition to the new billing system.