BSNL Leased Solutions:    
ISDN services are available in all important cities.....
BSNL ISDN (digital )services provides you to transmit voice, video and data simultaneously due to availability of two channels. you can use ISDN line for accessing internet , having video-conferencing and as a back to lease line also to ensure reliable connection all the time.
ISDN connections is available in two flavour BRI (2B+D) and PRI ( 30B +B) for home users BRI is required whereas PRI Line can be used for connectivity with EPABX or as a Lease line backup.The connectivity though ISDN line is very fast as compare to basic telephone.
For other details please contact 1500 or your nearest Customer service centre.