DoP has 25,000 departmental post offices and 1,30,000 rural post offices across the country.
CBS will enable customers to operate their accounts, and avail banking services from any post office on CBS network, regardless of where they maintain their account.
Regarding rural post offices, the official said all 130,000 post offices would be provided with solar powered, biometric hand-held devices by March 2017.
Supply to these devices to about 20,000 rural branch post offices shall be completed by March 31 this year.
To promote financial inclusion, the DoP is also going to set up payment bank by March 2017. It is going to finalise consultants for the payment bank by the end of this month.