Yes, Sandhyavandanam is an essential daily austerity for a Srivaishnava. It is important to listen to kalakshepam and upanyasam to learn about our tradition. But before that one should learn to recite Divyaprabandam and Swami Desika stotrams as a part of daily austerity followed by listening to kalakshepams as ordained by our preceptor.