New Delhi, June 6 :    New Delhi, June 6:  Bharat Sanchar Nigam Limited has threatened to cancel the interconnect agreement with Tata Teleservices Limited and other private basic telecom service providers if they fail to accept the revised interconnect provisions. Under the interconnect agreement, BSNL carries forward the local, STD and ISD calls made by the subscribers of a private basic telecom company to any subscribers premises irrespective of the service provider. A revenue sharing arrangement had been agreed by both parties based on the Telecommunication Interconnection Regulation, 1999, which allows private operators to retain 60 per cent of the revenue from a call while the remaining 40 per cent should be handed over to BSNL. However, BSNL has now asked these companies to revise the interconnection charges. The government-owned telecom company has proposed a new system which has come into effect from June 1. Under the new system, BSNL has proposed that the private operators should keep only 30 per cent of the STD revenue for the calls originating from their networks, while BSNL would retain the remaining 70 per cent. In the case of international calls originating from private networks, BSNL wants to retain 80 per cent of the total revenue and give only 20 per cent for the private operators. In the case of local calls originating from the private networks, BSNL proposes to retain 50 per cent of the revenue. Private basic telecom operators have opposed BSNL's proposal saying that this would ruin them. According to a letter from BSNL to Tata Teleservices Ltd, 'We have made our best efforts to give the reasons behind our proposed change in the revenue sharing arrangement. In the absence of any alternate proposal from your side, it is not feasible for us to extend the date of effect of the proposal from June 1.' The letter has also given TTL time till June 22 to come out with an alternate proposal 'failing which we may have no alternative but to consider temporary suspension of the interconnect agreement,' states the letter to TTL. Officials in BSNL said, 'In a call of one-minute duration from Hyderabad to Calcutta, TTL gets Rs 15.12 for carrying the call from the subscriber's premises to BSNL's automatic exchange in Hyderabad covering a distance of 3-4 kilometres. On the contrary, BSNL gets only Rs 10.08 for carrying their (TTL's) calls over a distance of about 1516 kms from Hyderabad to Calcutta and further carriage of 8-10 kms for termination to the called subscribers' premises.' He added, 'This is unjust and discriminatory. It causes under enrichment of the originating operator at the cost of the latter. The discrimination is more in case of ISD calls.' BSNL has been following the recommendations of TRAI's interconnection system with all the six private basic operators, since May 1999, based on the Telecommunication Interconnection Regulation, 1999.