Well it involves a UN force capable of repelling any attack from across the Jordan River (from north, or east) or across the Sinai. Thus it would prevent any non Israel or non Palestinian force entering any fighting. a UN built 67 border security fence - UN guarded on the PA side and the PA responsible for any terrorist actions from within it's territory. it would also require international management of the Mount policy and access arrangements. possibly an arrangement for a united Jerusalem while it was also capital of two states. This could involve a united city council over two others.
Jordan foreign minister says to speak with Kerry on Israel-Palestinian conflict (Reuters)
from the article: Looking back in anger