After ITI, You can go for the Lateral entry in Diploma courses in engineering streams like Electronic and Communication, Electrical, Computer Science and engineering etc, according to your interests and specialization in ITI. These 2 year courses are available in Gangra Institute of Technology, Lovely Professional University, Delhi Engineering College etc. This course will help you to have a deep knowledge about the basics of the stream and to go for B.Tech as lateral entry. More details can be snatched from the websites of these institutes.

I hope this helps you wirh your query.

Good luck!