Airtel — cannot make outgoing calls

I am unable to make outgoing calls while in roaming. Incoming call is working fine. This is happening since past 2 days. I recharged a pack of rs.399 and it showed recharge successful. As soon as i call a number it immidiately cuts off without ringing or any voice recording being played. I am currently in bhubaneshwar and only have one sim. So i m not able to contact anyone via phone calls. This is becoming really problematic for me. Kindly help!!!