New Delhi, March 30 :    New Delhi, March 30:  Bharat Sanchar Nigam Ltd (BSNL) today announced the new low rates for domestic and international long distance telephony, following the increase in pulse rate. Enhancing the pulse rate would mean reduced tariff for customers because the call-meter would now change after a longer duration. New rates would be effective from Monday. However, the PCO owners may not be able to offer this advantage to the customers immediately since the software in the metering equipment would have to be changed. Earlier, in its directive the Telecom Regulatory Authority of India had announced the new tariff as part of a rebalancing exercise. For STD calls, BSNL has changed the tariffs for mobile-to-fixed and vice versa, and mobile-to-mobile calls and also for calls from basic service operators to BSNL.