Egypt's state TV says defense lawyers for ousted leader Mohammed Morsi and other defendants have walked out of court to protest the soundproof glass cage in which defendants are placed.

It said judge Shaaban el-Shamy ordered a recess after the lawyers left Sunday's hearing, the first in a case in which Morsi and 35 others are facing charges of conspiring with foreign groups and undermining national security.

The cage was introduced after Morsi and his co-defendants interrupted the proceedings of other court cases by talking over the judge and chanting slogans. The cage is fitted to give the judge sole control over whether the defendants can be heard or not when speaking.

Morsi was ousted by the military following millions-strong protests after just one year in power.