How many states have joined in a pan-India network of single emergency helpline number '112'?

To get immediate assistance to the people who are in trouble, Union territories and 20 states have joined in a pan-India network of single emergency helpline number '112',which is implemented by central government's Nirbhaya Fund( 2012 Delhi gangrape case). Police (100),women(1090) and fire(10A) helpline numbers are amalgamated in this and is similar to '911' in US. Kerala, Uttarakhand, Madhya Pradesh, Uttar Pradesh,Andhra Pradesh, Punjab, Himachal Pradesh, Rajasthan, Puducherry, Tamil Nadu, Nagaland, Gujarat,Telangana,Lakshadweep,Andaman and Nicobar Islands, Dadar and Nagar Haveli, Daman and Diu,Jammu and Kashmir are the joined states ad UTs. When a person activate the panic button on the mobile,it will trigger an emergency call to 112.Emergency response Centre (ERC) can recieve panic call via voice call to 112,the '112' mobile app or email requests on state ERSS website.A long press of the '5' or '9' key will activate the panic call in normal case.