Rashmi, this idea of Universal Emergency Number is very similar to the idea of ChildLine - a tele-helpline for children in India that has been running very successfully.
In 1996, Jeroo Billmoria (a social entrepreneur) from India launched CHILDLINE (Dial 1098 Ten-Nine-Eight), India's first toll-free tele-helpline for street children in distress. As of March 2011, total of 21 Million calls since inception have been serviced by CHILDLINE service and operates in 172 cities/districts in 30 States and UTs through its network of 415 partner organisations across India. http://www.childlineindia.org.in/
And yes, this model is scalable across geographies and cultures too. After Childline's success, Jeroo went further and founded Child Helpline International (http://www.childhelplineinternational.org/) - an initiative that runs similar children helplines in more than 150 countries across the world and responds to 14-18 million calls annually.
To learn more about ChildLine, I would suggest you to go through these resources: