iOS pjsip video: get correct orientation

using pjsip 2.3.0 I am able to start video call. the only issue is the video orientation. the app supports all orientation on the ipad and portrait only on iphone. after rotating the ipad during video call, the iphone has video view which is not correctly oriented. i Know that there is PJMEDIA_VID_DEV_CAP_ORIENTATION = 128 is defined but i don't when and how to trigger this method so that video from A to B has the correct orientation. can some explain?