@members/sanchitgarg5/The way you explain your need, in the beginning was confusing.Basically you want to use two different ID's in your computer.( saying i want to use phone 1 and 2 etc was off track )One BB acct yours and another Your Dad's ( from his office ).Solution suggested : 1. If the office is in the same building draw a parallel telephone line to your room. (If far off ,BSNL will provide upto 2 KM distance. )2. Program the Modem in Dialup/wanminiport/Bridged mode. (Meaning you enter your UserID/PW externally. Not recorded in the modem.) 3. Change the RJ11 connection from telephone 1 ( yours) or telephone 2 ( Dad's) to the ADSL SPLITTER INPUT PORT. 4. Use Wanminiport dialer and enter/use whichever BB acct you need.Para two ;I am doing the same thing for two Different ISP's Airtel/Dataone and Beetel programmed to connect to either. Line 1Airtel OR Line 2 (BSNL/)====>>>RJ11>>ADSL Splitter LINE===>>>ADSLport Rj11 ===>modem===Rj45===>computer