Bharat Sanchar Nigam Limited, Reliance Communications and Bharti Airtel
are the largest communication service providers, and offer both ISDN
BRI and PRI services across the country. Reliance Communications and
Bharti Airtel uses the DLC technology for providing these services. With
the introduction of broadband technology, the load on bandwidth is
being absorbed by ADSL. ISDN continues to be an important backup network
for point-to-point leased line customers such as banks, Eseva Centers [1], Life Insurance Corporation of India, and SBI ATMs.
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