As a part of a new high-security intra-government communications project, about 700 secured phones are being used on a trial basis across four key installations in the national capital — Sena Bhavan in central Delhi, Cabinet Secretariat at CGO complex, NSG headquarters near the airport and Lok Nayak Bhavan near Khan Market.
The Secure and Dedicated Communication Network (SDCN) system is being deployed on the network of state-owned MTNL with secure VoIP (Voice over Internet Protocol) phones on which the calls can be accessed with biometric authentication.
Initially, the Centre hopes to deploy SDCN on a network of 5,000 secured phones in Delhi. It may then expand it further to 20,000 phones across state capitals, “vulnerable and strategic” installations, and districts in Jammu and Kashmir and the Northeast. The phones will be designated for the exclusive use of government departments, independent of existing public and private communication infrastructure.
The execution of the proposed SDCN project has been entrusted to the Centre for Development of Telematics (C-DoT), a government-owned telecommunications technology development centre.
C-DoT is to provide 5,000 secured phones for subscribers designated by the Ministry of Home Affairs and ensure the conversion of the existing Restricted Access Exchange, or RAX, numbers being used in Delhi by the central government for intra-Government communication. “The system is in testing and installation phase,” said a government official.
SDCN is a major flagship project of the Department of Telecommunications and marks a big technological upgrade over the old RAX system. It deploys IP (internet protocol) network-supporting voice and multimedia services and encryption at different levels for signalling.
It is supposed to be a captive network, which cannot be accessed from any other network and uses dedicated ‘dark fiber’ (or unused fibre-optic cable) of MTNL to connect different locations.
Currently, this new system is running parallel to the existing RAX system at the four government buildings where, according to MTNL, there are 1,243 RAX connections. Work to install the new, secure connections — the customer-end secure VoIP telephone is called CPE or customer premises equipment — is tentatively planned to be completed by March 15. The Lok Nayak Bhavan, incidentally, houses the headquarters of the Enforcement Directorate (ED), among other government offices.
Officials indicated that all the network elements of SDCN are being installed in Delhi in association with MTNL’s Delhi unit. The network comprises soft switch, which is installed in North Block, with disaster recovery site at C-DoT campus. The other elements are four routers, 16 aggregators and 63 digital subscriber line access multiplexes.
“The end devices are secure VoIP phones called CPE, on which the calls can be accessed with biometric authentication. The CPE and the network have the capability to subsequently provide for secure email services through the dedicated network,” an official said. According to internal estimates, a cost of Rs 2,354 per user per month has been worked out by amortizing the cumulative capital cost over a period of 10 years, considering a base of 5,000 users.
> VoIP enables transfer of voice content over Internet, Intranet or other packet-switched networks. The signal is separated into frames, stored in data packets, and transported over IP networks.
> SDCN network elements comprise core routers, aggregators, digital subscriber line access and the secure VoIP telephones, with the servers at North Block.