How to activate or deactivate call waiting in BSNL Landline

Call waiting is very important features in BSNL Landline because when you are talking with some one a continuous beep will come to your Land phone. It will clear to you that some one are trying to contact with me then you can finish your phone and try to access another phone.

Activate Call Waiting: 

          To Activate Call waiting facility,  you Landline dial 118 from your Landline

Deactivate Call Waiting: 

          To Deactivate Call waiting facility, you Landline dial 119 from your Landline