Not able to make any call with my lumia 710

Not able to make any call with my lumia 710 though other then call everything is working fine. I chacked my SIM in other phone, i there phone i can make calls. Whats wrong with my phone?
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hi
i am using nokia lumia since last 6 months. i am having aitel connection. till few days back i was able to make phone calls however now phone calls are immediately getting ended.  i m able to send sms, receive calls and use intenel..problem presisits only with receiving call..
suggest me a way out..plz..