its not regular, but bsnl makes publice statement wrt a particular city, saying dat it has ramped up its infrastructure recently in a given city 2 cope up with d increasing no of bb applicants
best 2 keep track of it in newspapers, where they announce the arrival of so..and..so switching system from siemens....or any other vendor
so wen u c such announcement from bsnl u no dat u will get a bb connexion soon
but dat does not mean dat if dey ramp up der infrastructure dey will announce in newspaper, dey just do it from time 2 time