Dear Sharmila,
As far as indiscipline is concerned, we percieve verbal and written warning in the incipient stage is very much imperative. Despite of this, if there is no improvisation in the behaviour or conduct, then policy of termination could be applied. and we can also move ahead as per HR Manual as well the guidelines of company.
But yes, of course there is no point of notice period after warning to employee.
would request members of citehr to justify as well comment my point:) also.