No other special tariff voucher is giving this benefit.
In order to encourage the customers to use BSNL network for O/G calls, has also launched Voice STV@ 319 which also provide Unlimited voice ( Local/ STD) on any net-work and national roaming ( except Delhi and Mumbai) with validity of 90 days on PAN India basis.
BSNL is committed to provide affordable and efficient services to the customers. These special tariff vouchers are only for voice calls and gives unlimited calling those customers who are not using data services.
For more details Dial BSNL Mobile services 1503.