Simulcast Video Stream Related

In Android and iOS App simulcast is implemented. But in .Net App simulcast is not implemented.
I am getting following video stream for Android device and able to display video frame in .Net App.
{
“janus”: “event”,
“session_id”: 8076148040593663,
“sender”: 845623191447248,
“plugindata”: {
“plugin”: “janus.plugin.videoroom”,
“data”: {
“videoroom”: “event”,
“room”: 2004651450238867,
“mid”: “0”,
“substream”: 2
}
}
}

BUT getting followings for iOS and could not able to display video frame in .Net App.
{
“janus”: “event”,
“session_id”: 4907747695375635,
“sender”: 7758831316873189,
“plugindata”: {
“plugin”: “janus.plugin.videoroom”,
“data”: {
“videoroom”: “event”,
“room”: 7161733864290029,
“mid”: “0”,
“substream”: 2
}
}
}

{
“janus”: “event”,
“session_id”: 4907747695375635,
“sender”: 7758831316873189,
“plugindata”: {
“plugin”: “janus.plugin.videoroom”,
“data”: {
“videoroom”: “event”,
“room”: 7161733864290029,
“mid”: “0”,
“temporal”: 2
}
}
}

Would you please let me know why I am getting “temporal”: 2 for iOS?

If a WebRTC library has no feature of simulcast, then can it subscribe video stream sent by a device simulcast implemented. Need to send any special field or flag in Janus subscription message