Olavu Geluvu

Olavu Geluvu (Kannada: ಒಲವು ಗೆಲುವು) is a 1977 Indian Kannada film, directed by H. R. Bhargava and produced by S. A. Srinivas. The film stars Rajkumar, Lakshmi, Balakrishna and Sampath in the lead roles. The film has musical score by G. K. Venkatesh. 
A famous sequence from this movie - where the hero repeatedly calls a landline number but disconnects the call giving a feel of wrong connection but finally doesn't disconnect it when both the villains are into discussion - went on to be used in the 1984 Hindi movie "Duniya".
Plot.
The lead character Rajkumar plays the role of an English professor, Mohan, in this movie. The story begins with a few fun-filled incidents that happen between him and Rohini, the most popular girl in college (played by Lakshmi). As the story unfolds, the two lead characters end up falling in love. The news of their love affair reach both the families and leads to Rohini deciding to end the relationship. Rajkumar's mentally ill brother then becomes the focus for the rest of the film.
Soundtrack.
The music was composed by G. K. Venkatesh.