Doubt regarding tb treatment. Is clear?

Can someone Tell me what is the treatment schedule for Tuberculosis in India as per WHO , plz don't give me Diplomatic answer , like talk to nearest Tb hospital or pulmonologist and all. As I had it all ...no body is clear regarding this treatment every doctor telling same thing. If one have been diagnosed with TB (test results-  Sputum For AFB negative , HB-10, ESR -99, rest all CBC normal , TB Gold test - Positive) physical symptoms cough lasts for 20 days , fever for 5 days no weight loss , no continues fever , doctor asked to start TB treatment it's been 4 months on treatment, but my question is should we continue with all the drugs as we are on ( Rifampicin 450, Isoniazid 300, Pyrazinamide 750, And Ethambutol 600,) for six month or there is any change in treatment schedule...plz clarify