Telecom Regulatory Authority of India,TRAI, will impose hefty penalties on unwanted calls from tomorrow. In a move that will give major relief to millions of subscribers, telecom regulator TRAI will tomorrow announce new guidelines to curb the menace of unsolicited calls by imposing hefty penalties on errant telemarketing firms and operators. Besides hefty penalties, the telemarketing firms would be alloted a separate series of numbers beginning with '700' that would allow subscribers to recognise their calls and decide whether to accept or reject them. According to sources, TRAI has proposed to impose a penalty of up to Two lakh rupees on telemarketing firms against whom complaints have been received six times, before blocking the number.