Originally from Calcutta Telephones

Different broadband ISP in India or anywhere else in the world has different settings as far as modem settings and internet connection is concerned.

Airtel provides internet connection that do not requires dialing,as the username,password is stored in modem’s firmware.But by default BSNL provides internet connection that requires dialing.

Here is what has to be done to store username,password in modem and hence multiple pcs can be connected through lan wire from modem or attaching extra router or switch as the need may be.

See here..(for Huawei MT841 modem)

For other types of modem see here.