Automatic Number Retention Scheme for TATA Docomo Prepaid ?

I'm going abroad for a few months and wanted to keep my number 'alive' so that I could use it when I come back to India. I'm aware that TRAI had made it compulsory for telecom operators to offer this service but I can't find this mentioned anywhere on TATA Docomo's website (I can find it on Airtel, Vodafone etc. websites though). Can someone help me out with this ?