In cases where the police can arrest someone without a warrant but are of the opinion that arrest is not required, they can issue a notice to such person to appear before the police or any place specified in the notice. However, the precondition to such a notice is that there must be a complaint made against him or some reasonable suspicion should exist that he has committed such a crime.
When such a notice has been issued to a person, he is duty-bound by law to comply with the terms of the notice. As long as the person complies, the police will not arrest him (unless they are of the opinion that he should be arrested and has recorded in writing that arrest is necessary).
If the person given notice by the police fails to comply or refuses to identify himself, the police officer may arrest him for the offence mentioned in the notice then the police will approach the Court to get an order to arrest the person.